source: src/InitTweak/InitTweak.cc@ 7e4b44db

new-env with_gc
Last change on this file since 7e4b44db was 8d7bef2, checked in by Aaron Moss <a3moss@…>, 8 years ago

First compiling build of CFA-CC with GC
  • Property mode set to 100644
File size: 24.1 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/PassVisitor.h"
8#include "Common/SemanticError.h" // for SemanticError
9#include "Common/UniqueName.h" // for UniqueName
10#include "Common/utility.h" // for toString, deleteAll, maybeClone
11#include "GenPoly/GenPoly.h" // for getFunctionType
12#include "InitTweak.h"
13#include "Parser/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic
14#include "ResolvExpr/typeops.h" // for typesCompatibleIgnoreQualifiers
15#include "SymTab/Autogen.h"
16#include "SymTab/Indexer.h" // for Indexer
17#include "SynTree/Attribute.h" // for Attribute
18#include "SynTree/Constant.h" // for Constant
19#include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType
20#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applicati...
21#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
22#include "SynTree/Label.h" // for Label
23#include "SynTree/Statement.h" // for CompoundStmt, ExprStmt, BranchStmt
24#include "SynTree/Type.h" // for FunctionType, ArrayType, PointerType
25#include "SynTree/Visitor.h" // for Visitor, maybeAccept
26#include "Tuples/Tuples.h" // for Tuples::isTtype
27
28class UntypedValofExpr;
29
30namespace InitTweak {
31 namespace {
32 struct HasDesignations : public WithShortCircuiting {
33 bool hasDesignations = false;
34
35 void previsit( BaseSyntaxNode * ) {
36 // short circuit if we already know there are designations
37 if ( hasDesignations ) visit_children = false;
38 }
39
40 void previsit( Designation * des ) {
41 // short circuit if we already know there are designations
42 if ( hasDesignations ) visit_children = false;
43 else if ( ! des->get_designators().empty() ) {
44 hasDesignations = true;
45 visit_children = false;
46 }
47 }
48 };
49
50 struct InitDepthChecker : public WithGuards {
51 bool depthOkay = true;
52 Type * type;
53 int curDepth = 0, maxDepth = 0;
54 InitDepthChecker( Type * type ) : type( type ) {
55 Type * t = type;
56 while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) {
57 maxDepth++;
58 t = at->get_base();
59 }
60 maxDepth++;
61 }
62 void previsit( ListInit * ) {
63 curDepth++;
64 GuardAction( [this]() { curDepth--; } );
65 if ( curDepth > maxDepth ) depthOkay = false;
66 }
67 };
68
69 struct InitFlattener : public WithShortCircuiting {
70 void previsit( SingleInit * singleInit ) {
71 visit_children = false;
72 argList.push_back( singleInit->value->clone() );
73 }
74 std::list< Expression * > argList;
75 };
76
77 }
78
79 std::list< Expression * > makeInitList( Initializer * init ) {
80 PassVisitor<InitFlattener> flattener;
81 maybeAccept( init, flattener );
82 return flattener.pass.argList;
83 }
84
85 bool isDesignated( Initializer * init ) {
86 PassVisitor<HasDesignations> finder;
87 maybeAccept( init, finder );
88 return finder.pass.hasDesignations;
89 }
90
91 bool checkInitDepth( ObjectDecl * objDecl ) {
92 PassVisitor<InitDepthChecker> checker( objDecl->type );
93 maybeAccept( objDecl->init, checker );
94 return checker.pass.depthOkay;
95 }
96
97 class InitExpander::ExpanderImpl {
98 public:
99 virtual ~ExpanderImpl() = default;
100 virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0;
101 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0;
102 };
103
104 class InitImpl : public InitExpander::ExpanderImpl {
105 public:
106 InitImpl( Initializer * init ) : init( init ) {}
107 virtual ~InitImpl() = default;
108
109 virtual std::list< Expression * > next( __attribute((unused)) std::list< Expression * > & indices ) {
110 // this is wrong, but just a placeholder for now
111 // if ( ! flattened ) flatten( indices );
112 // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >();
113 return makeInitList( init );
114 }
115
116 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
117 private:
118 Initializer * init;
119 };
120
121 class ExprImpl : public InitExpander::ExpanderImpl {
122 public:
123 ExprImpl( Expression * expr ) : arg( expr ) {}
124 virtual ~ExprImpl() = default;
125
126 virtual std::list< Expression * > next( std::list< Expression * > & indices ) {
127 std::list< Expression * > ret;
128 Expression * expr = maybeClone( arg );
129 if ( expr ) {
130 for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) {
131 // go through indices and layer on subscript exprs ?[?]
132 ++it;
133 UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") );
134 subscriptExpr->get_args().push_back( expr );
135 subscriptExpr->get_args().push_back( (*it)->clone() );
136 expr = subscriptExpr;
137 }
138 ret.push_back( expr );
139 }
140 return ret;
141 }
142
143 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
144 private:
145 Expression * arg;
146 };
147
148 InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {}
149
150 InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {}
151
152 std::list< Expression * > InitExpander::operator*() {
153 return cur;
154 }
155
156 InitExpander & InitExpander::operator++() {
157 cur = expander->next( indices );
158 return *this;
159 }
160
161 // use array indices list to build switch statement
162 void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) {
163 indices.push_back( index );
164 indices.push_back( dimension );
165 }
166
167 void InitExpander::clearArrayIndices() {
168 indices.clear();
169 }
170
171 bool InitExpander::addReference() {
172 bool added = false;
173 for ( Expression *& expr : cur ) {
174 expr = new AddressExpr( expr );
175 added = true;
176 }
177 return added;
178 }
179
180 namespace {
181 /// given index i, dimension d, initializer init, and callExpr f, generates
182 /// if (i < d) f(..., init)
183 /// ++i;
184 /// so that only elements within the range of the array are constructed
185 template< typename OutIterator >
186 void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) {
187 UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") );
188 cond->get_args().push_back( index->clone() );
189 cond->get_args().push_back( dimension->clone() );
190
191 std::list< Expression * > args = makeInitList( init );
192 callExpr->get_args().splice( callExpr->get_args().end(), args );
193
194 *out++ = new IfStmt( cond, new ExprStmt( callExpr ), nullptr );
195
196 UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) );
197 increment->get_args().push_back( index->clone() );
198 *out++ = new ExprStmt( increment );
199 }
200
201 template< typename OutIterator >
202 void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) {
203 if ( idx == idxEnd ) return;
204 Expression * index = *idx++;
205 assert( idx != idxEnd );
206 Expression * dimension = *idx++;
207
208 // xxx - may want to eventually issue a warning here if we can detect
209 // that the number of elements exceeds to dimension of the array
210 if ( idx == idxEnd ) {
211 if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) {
212 for ( Initializer * init : *listInit ) {
213 buildCallExpr( callExpr->clone(), index, dimension, init, out );
214 }
215 } else {
216 buildCallExpr( callExpr->clone(), index, dimension, init, out );
217 }
218 } else {
219 std::list< Statement * > branches;
220
221 unsigned long cond = 0;
222 ListInit * listInit = dynamic_cast< ListInit * >( init );
223 if ( ! listInit ) {
224 // xxx - this shouldn't be an error, but need a way to
225 // terminate without creating output, so should catch this error
226 SemanticError( init->location, "unbalanced list initializers" );
227 }
228
229 static UniqueName targetLabel( "L__autogen__" );
230 Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } );
231 for ( Initializer * init : *listInit ) {
232 Expression * condition;
233 // check for designations
234 // if ( init-> ) {
235 condition = new ConstantExpr( Constant::from_ulong( cond ) );
236 ++cond;
237 // } else {
238 // condition = // ... take designation
239 // cond = // ... take designation+1
240 // }
241 std::list< Statement * > stmts;
242 build( callExpr, idx, idxEnd, init, back_inserter( stmts ) );
243 stmts.push_back( new BranchStmt( switchLabel, BranchStmt::Break ) );
244 CaseStmt * caseStmt = new CaseStmt( condition, stmts );
245 branches.push_back( caseStmt );
246 }
247 *out++ = new SwitchStmt( index->clone(), branches );
248 *out++ = new NullStmt( { switchLabel } );
249 }
250 }
251 }
252
253 // if array came with an initializer list: initialize each element
254 // may have more initializers than elements in the array - need to check at each index that
255 // we haven't exceeded size.
256 // may have fewer initializers than elements in the array - need to default construct
257 // remaining elements.
258 // To accomplish this, generate switch statement, consuming all of expander's elements
259 Statement * InitImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) {
260 if ( ! init ) return nullptr;
261 CompoundStmt * block = new CompoundStmt();
262 build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) );
263 if ( block->get_kids().empty() ) {
264 return nullptr;
265 } else {
266 init = nullptr; // init was consumed in creating the list init
267 return block;
268 }
269 }
270
271 Statement * ExprImpl::buildListInit( UntypedExpr *, std::list< Expression * > & ) {
272 return nullptr;
273 }
274
275 Statement * InitExpander::buildListInit( UntypedExpr * dst ) {
276 return expander->buildListInit( dst, indices );
277 }
278
279 Type * getTypeofThis( FunctionType * ftype ) {
280 assertf( ftype, "getTypeofThis: nullptr ftype" );
281 ObjectDecl * thisParam = getParamThis( ftype );
282 ReferenceType * refType = strict_dynamic_cast< ReferenceType * >( thisParam->type );
283 return refType->base;
284 }
285
286 ObjectDecl * getParamThis( FunctionType * ftype ) {
287 assertf( ftype, "getParamThis: nullptr ftype" );
288 auto & params = ftype->parameters;
289 assertf( ! params.empty(), "getParamThis: ftype with 0 parameters: %s", toString( ftype ).c_str() );
290 return strict_dynamic_cast< ObjectDecl * >( params.front() );
291 }
292
293 bool tryConstruct( DeclarationWithType * dwt ) {
294 ObjectDecl * objDecl = dynamic_cast< ObjectDecl * >( dwt );
295 if ( ! objDecl ) return false;
296 return (objDecl->get_init() == nullptr ||
297 ( objDecl->get_init() != nullptr && objDecl->get_init()->get_maybeConstructed() ))
298 && ! objDecl->get_storageClasses().is_extern
299 && isConstructable( objDecl->type );
300 }
301
302 bool isConstructable( Type * type ) {
303 return ! dynamic_cast< VarArgsType * >( type ) && ! dynamic_cast< ReferenceType * >( type ) && ! dynamic_cast< FunctionType * >( type ) && ! Tuples::isTtype( type );
304 }
305
306 struct CallFinder {
307 CallFinder( const std::list< std::string > & names ) : names( names ) {}
308
309 void postvisit( ApplicationExpr * appExpr ) {
310 handleCallExpr( appExpr );
311 }
312
313 void postvisit( UntypedExpr * untypedExpr ) {
314 handleCallExpr( untypedExpr );
315 }
316
317 std::list< Expression * > * matches;
318 private:
319 const std::list< std::string > names;
320
321 template< typename CallExpr >
322 void handleCallExpr( CallExpr * expr ) {
323 std::string fname = getFunctionName( expr );
324 if ( std::find( names.begin(), names.end(), fname ) != names.end() ) {
325 matches->push_back( expr );
326 }
327 }
328 };
329
330 void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) {
331 static PassVisitor<CallFinder> finder( std::list< std::string >{ "?{}", "^?{}" } );
332 finder.pass.matches = &matches;
333 maybeAccept( stmt, finder );
334 }
335
336 Expression * getCtorDtorCall( Statement * stmt ) {
337 std::list< Expression * > matches;
338 collectCtorDtorCalls( stmt, matches );
339 assert( matches.size() <= 1 );
340 return matches.size() == 1 ? matches.front() : nullptr;
341 }
342
343 namespace {
344 DeclarationWithType * getCalledFunction( Expression * expr );
345
346 template<typename CallExpr>
347 DeclarationWithType * handleDerefCalledFunction( CallExpr * expr ) {
348 // (*f)(x) => should get "f"
349 std::string name = getFunctionName( expr );
350 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
351 assertf( ! expr->get_args().empty(), "Cannot get called function from dereference with no arguments" );
352 return getCalledFunction( expr->get_args().front() );
353 }
354
355 DeclarationWithType * getCalledFunction( Expression * expr ) {
356 assert( expr );
357 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
358 return varExpr->var;
359 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) {
360 return memberExpr->member;
361 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
362 return getCalledFunction( castExpr->arg );
363 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( expr ) ) {
364 return handleDerefCalledFunction( untypedExpr );
365 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) {
366 return handleDerefCalledFunction( appExpr );
367 } else if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( expr ) ) {
368 return getCalledFunction( addrExpr->arg );
369 } else if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( expr ) ) {
370 return getCalledFunction( commaExpr->arg2 );
371 }
372 return nullptr;
373 }
374 }
375
376 DeclarationWithType * getFunction( Expression * expr ) {
377 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
378 return getCalledFunction( appExpr->get_function() );
379 } else if ( UntypedExpr * untyped = dynamic_cast< UntypedExpr * > ( expr ) ) {
380 return getCalledFunction( untyped->get_function() );
381 }
382 assertf( false, "getFunction received unknown expression: %s", toString( expr ).c_str() );
383 }
384
385 ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) {
386 ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr );
387 if ( ! appExpr ) return nullptr;
388 DeclarationWithType * function = getCalledFunction( appExpr->get_function() );
389 assertf( function, "getCalledFunction returned nullptr: %s", toString( appExpr->get_function() ).c_str() );
390 // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor
391 // will call all member dtors, and some members may have a user defined dtor.
392 return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : nullptr;
393 }
394
395 namespace {
396 template <typename Predicate>
397 bool allofCtorDtor( Statement * stmt, const Predicate & pred ) {
398 std::list< Expression * > callExprs;
399 collectCtorDtorCalls( stmt, callExprs );
400 // if ( callExprs.empty() ) return false; // xxx - do I still need this check?
401 return std::all_of( callExprs.begin(), callExprs.end(), pred);
402 }
403 }
404
405 bool isIntrinsicSingleArgCallStmt( Statement * stmt ) {
406 return allofCtorDtor( stmt, []( Expression * callExpr ){
407 if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) {
408 FunctionType *funcType = GenPoly::getFunctionType( appExpr->get_function()->get_result() );
409 assert( funcType );
410 return funcType->get_parameters().size() == 1;
411 }
412 return false;
413 });
414 }
415
416 bool isIntrinsicCallStmt( Statement * stmt ) {
417 return allofCtorDtor( stmt, []( Expression * callExpr ) {
418 return isIntrinsicCallExpr( callExpr );
419 });
420 }
421
422 namespace {
423 template<typename CallExpr>
424 Expression *& callArg( CallExpr * callExpr, unsigned int pos ) {
425 if ( pos >= callExpr->get_args().size() ) assertf( false, "getCallArg for argument that doesn't exist: (%u); %s.", pos, toString( callExpr ).c_str() );
426 for ( Expression *& arg : callExpr->get_args() ) {
427 if ( pos == 0 ) return arg;
428 pos--;
429 }
430 assert( false );
431 }
432 }
433
434 Expression *& getCallArg( Expression * callExpr, unsigned int pos ) {
435 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) {
436 return callArg( appExpr, pos );
437 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) {
438 return callArg( untypedExpr, pos );
439 } else if ( TupleAssignExpr * tupleExpr = dynamic_cast< TupleAssignExpr * > ( callExpr ) ) {
440 std::list< Statement * > & stmts = tupleExpr->get_stmtExpr()->get_statements()->get_kids();
441 assertf( ! stmts.empty(), "TupleAssignExpr somehow has no statements." );
442 ExprStmt * stmt = strict_dynamic_cast< ExprStmt * >( stmts.back() );
443 TupleExpr * tuple = strict_dynamic_cast< TupleExpr * >( stmt->get_expr() );
444 assertf( ! tuple->get_exprs().empty(), "TupleAssignExpr somehow has empty tuple expr." );
445 return getCallArg( tuple->get_exprs().front(), pos );
446 } else if ( ImplicitCopyCtorExpr * copyCtor = dynamic_cast< ImplicitCopyCtorExpr * >( callExpr ) ) {
447 return getCallArg( copyCtor->callExpr, pos );
448 } else {
449 assertf( false, "Unexpected expression type passed to getCallArg: %s", toString( callExpr ).c_str() );
450 }
451 }
452
453 namespace {
454 std::string funcName( Expression * func );
455
456 template<typename CallExpr>
457 std::string handleDerefName( CallExpr * expr ) {
458 // (*f)(x) => should get name "f"
459 std::string name = getFunctionName( expr );
460 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
461 assertf( ! expr->get_args().empty(), "Cannot get function name from dereference with no arguments" );
462 return funcName( expr->get_args().front() );
463 }
464
465 std::string funcName( Expression * func ) {
466 if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) {
467 return nameExpr->get_name();
468 } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) {
469 return varExpr->get_var()->get_name();
470 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) {
471 return funcName( castExpr->get_arg() );
472 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) {
473 return memberExpr->get_member()->get_name();
474 } else if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * > ( func ) ) {
475 return funcName( memberExpr->get_member() );
476 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( func ) ) {
477 return handleDerefName( untypedExpr );
478 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( func ) ) {
479 return handleDerefName( appExpr );
480 } else if ( ConstructorExpr * ctorExpr = dynamic_cast< ConstructorExpr * >( func ) ) {
481 return funcName( getCallArg( ctorExpr->get_callExpr(), 0 ) );
482 } else {
483 assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() );
484 }
485 }
486 }
487
488 std::string getFunctionName( Expression * expr ) {
489 // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and
490 // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction
491 // can't possibly do anything reasonable.
492 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
493 return funcName( appExpr->get_function() );
494 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) {
495 return funcName( untypedExpr->get_function() );
496 } else {
497 std::cerr << expr << std::endl;
498 assertf( false, "Unexpected expression type passed to getFunctionName" );
499 }
500 }
501
502 Type * getPointerBase( Type * type ) {
503 if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) {
504 return ptrType->get_base();
505 } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
506 return arrayType->get_base();
507 } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) {
508 return refType->get_base();
509 } else {
510 return nullptr;
511 }
512 }
513
514 Type * isPointerType( Type * type ) {
515 if ( getPointerBase( type ) ) return type;
516 else return nullptr;
517 }
518
519 ApplicationExpr * createBitwiseAssignment( Expression * dst, Expression * src ) {
520 static FunctionDecl * assign = nullptr;
521 if ( ! assign ) {
522 // temporary? Generate a fake assignment operator to represent bitwise assignments.
523 // This operator could easily exist as a real function, but it's tricky because nothing should resolve to this function.
524 TypeDecl * td = new TypeDecl( "T", noStorageClasses, nullptr, TypeDecl::Dtype, true );
525 assign = new FunctionDecl( "?=?", noStorageClasses, LinkageSpec::Intrinsic, SymTab::genAssignType( new TypeInstType( noQualifiers, td->name, td ) ), nullptr );
526 }
527 if ( dynamic_cast< ReferenceType * >( dst->result ) ) {
528 dst = new AddressExpr( dst );
529 } else {
530 dst = new CastExpr( dst, new ReferenceType( noQualifiers, dst->result->clone() ) );
531 }
532 if ( dynamic_cast< ReferenceType * >( src->result ) ) {
533 src = new CastExpr( src, new ReferenceType( noQualifiers, src->result->stripReferences()->clone() ) );
534 }
535 return new ApplicationExpr( VariableExpr::functionPointer( assign ), { dst, src } );
536 }
537
538 struct ConstExprChecker : public WithShortCircuiting {
539 // most expressions are not const expr
540 void previsit( Expression * ) { isConstExpr = false; visit_children = false; }
541
542 void previsit( AddressExpr *addressExpr ) {
543 visit_children = false;
544
545 // address of a variable or member expression is constexpr
546 Expression * arg = addressExpr->get_arg();
547 if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false;
548 }
549
550 // these expressions may be const expr, depending on their children
551 void previsit( SizeofExpr * ) {}
552 void previsit( AlignofExpr * ) {}
553 void previsit( UntypedOffsetofExpr * ) {}
554 void previsit( OffsetofExpr * ) {}
555 void previsit( OffsetPackExpr * ) {}
556 void previsit( AttrExpr * ) {}
557 void previsit( CommaExpr * ) {}
558 void previsit( LogicalExpr * ) {}
559 void previsit( ConditionalExpr * ) {}
560 void previsit( CastExpr * ) {}
561 void previsit( ConstantExpr * ) {}
562
563 void previsit( VariableExpr * varExpr ) {
564 visit_children = false;
565
566 if ( EnumInstType * inst = dynamic_cast< EnumInstType * >( varExpr->result ) ) {
567 long long int value;
568 if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {
569 // enumerators are const expr
570 return;
571 }
572 }
573 isConstExpr = false;
574 }
575
576 bool isConstExpr = true;
577 };
578
579 bool isConstExpr( Expression * expr ) {
580 if ( expr ) {
581 PassVisitor<ConstExprChecker> checker;
582 expr->accept( checker );
583 return checker.pass.isConstExpr;
584 }
585 return true;
586 }
587
588 bool isConstExpr( Initializer * init ) {
589 if ( init ) {
590 PassVisitor<ConstExprChecker> checker;
591 init->accept( checker );
592 return checker.pass.isConstExpr;
593 } // if
594 // for all intents and purposes, no initializer means const expr
595 return true;
596 }
597
598 bool isConstructor( const std::string & str ) { return str == "?{}"; }
599 bool isDestructor( const std::string & str ) { return str == "^?{}"; }
600 bool isAssignment( const std::string & str ) { return str == "?=?"; }
601 bool isCtorDtor( const std::string & str ) { return isConstructor( str ) || isDestructor( str ); }
602 bool isCtorDtorAssign( const std::string & str ) { return isCtorDtor( str ) || isAssignment( str ); }
603
604 FunctionDecl * isCopyFunction( Declaration * decl, const std::string & fname ) {
605 FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl );
606 if ( ! function ) return nullptr;
607 if ( function->name != fname ) return nullptr;
608 FunctionType * ftype = function->type;
609 if ( ftype->parameters.size() != 2 ) return nullptr;
610
611 Type * t1 = getPointerBase( ftype->get_parameters().front()->get_type() );
612 Type * t2 = ftype->parameters.back()->get_type();
613 assert( t1 );
614
615 if ( ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2, SymTab::Indexer() ) ) {
616 return function;
617 } else {
618 return nullptr;
619 }
620 }
621
622 FunctionDecl * isAssignment( Declaration * decl ) {
623 return isCopyFunction( decl, "?=?" );
624 }
625 FunctionDecl * isDestructor( Declaration * decl ) {
626 if ( isDestructor( decl->get_name() ) ) {
627 return dynamic_cast< FunctionDecl * >( decl );
628 }
629 return nullptr;
630 }
631 FunctionDecl * isDefaultConstructor( Declaration * decl ) {
632 if ( isConstructor( decl->name ) ) {
633 if ( FunctionDecl * func = dynamic_cast< FunctionDecl * >( decl ) ) {
634 if ( func->type->parameters.size() == 1 ) {
635 return func;
636 }
637 }
638 }
639 return nullptr;
640 }
641 FunctionDecl * isCopyConstructor( Declaration * decl ) {
642 return isCopyFunction( decl, "?{}" );
643 }
644}
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