source: src/SymTab/Validate.cc@ 1b54b54

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr persistent-indexer pthread-emulation qualifiedEnum
Last change on this file since 1b54b54 was 7e08acf, checked in by Rob Schluntz <rschlunt@…>, 7 years ago

Apply generic substitution to qualified typedefs
  • Property mode set to 100644
File size: 51.8 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// Validate.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Sun May 17 21:50:04 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Mon Aug 28 13:47:23 2017
13// Update Count : 359
14//
15
16// The "validate" phase of translation is used to take a syntax tree and convert it into a standard form that aims to be
17// as regular in structure as possible. Some assumptions can be made regarding the state of the tree after this pass is
18// complete, including:
19//
20// - No nested structure or union definitions; any in the input are "hoisted" to the level of the containing struct or
21// union.
22//
23// - All enumeration constants have type EnumInstType.
24//
25// - The type "void" never occurs in lists of function parameter or return types. A function
26// taking no arguments has no argument types.
27//
28// - No context instances exist; they are all replaced by the set of declarations signified by the context, instantiated
29// by the particular set of type arguments.
30//
31// - Every declaration is assigned a unique id.
32//
33// - No typedef declarations or instances exist; the actual type is substituted for each instance.
34//
35// - Each type, struct, and union definition is followed by an appropriate assignment operator.
36//
37// - Each use of a struct or union is connected to a complete definition of that struct or union, even if that
38// definition occurs later in the input.
39
40#include "Validate.h"
41
42#include <cassert> // for assertf, assert
43#include <cstddef> // for size_t
44#include <list> // for list
45#include <string> // for string
46#include <utility> // for pair
47
48#include "CodeGen/CodeGenerator.h" // for genName
49#include "CodeGen/OperatorTable.h" // for isCtorDtor, isCtorDtorAssign
50#include "ControlStruct/Mutate.h" // for ForExprMutator
51#include "Common/PassVisitor.h" // for PassVisitor, WithDeclsToAdd
52#include "Common/ScopedMap.h" // for ScopedMap
53#include "Common/SemanticError.h" // for SemanticError
54#include "Common/UniqueName.h" // for UniqueName
55#include "Common/utility.h" // for operator+, cloneAll, deleteAll
56#include "Concurrency/Keywords.h" // for applyKeywords
57#include "FixFunction.h" // for FixFunction
58#include "Indexer.h" // for Indexer
59#include "InitTweak/GenInit.h" // for fixReturnStatements
60#include "InitTweak/InitTweak.h" // for isCtorDtorAssign
61#include "Parser/LinkageSpec.h" // for C
62#include "ResolvExpr/typeops.h" // for typesCompatible
63#include "ResolvExpr/Resolver.h" // for findSingleExpression
64#include "ResolvExpr/ResolveTypeof.h" // for resolveTypeof
65#include "SymTab/Autogen.h" // for SizeType
66#include "SynTree/Attribute.h" // for noAttributes, Attribute
67#include "SynTree/Constant.h" // for Constant
68#include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType
69#include "SynTree/Expression.h" // for CompoundLiteralExpr, Expressio...
70#include "SynTree/Initializer.h" // for ListInit, Initializer
71#include "SynTree/Label.h" // for operator==, Label
72#include "SynTree/Mutator.h" // for Mutator
73#include "SynTree/Type.h" // for Type, TypeInstType, EnumInstType
74#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
75#include "SynTree/Visitor.h" // for Visitor
76#include "Validate/HandleAttributes.h" // for handleAttributes
77
78class CompoundStmt;
79class ReturnStmt;
80class SwitchStmt;
81
82#define debugPrint( x ) if ( doDebug ) x
83
84namespace SymTab {
85 /// hoists declarations that are difficult to hoist while parsing
86 struct HoistTypeDecls final : public WithDeclsToAdd {
87 void previsit( SizeofExpr * );
88 void previsit( AlignofExpr * );
89 void previsit( UntypedOffsetofExpr * );
90 void previsit( CompoundLiteralExpr * );
91 void handleType( Type * );
92 };
93
94 struct FixQualifiedTypes final : public WithIndexer {
95 Type * postmutate( QualifiedType * );
96 };
97
98 struct HoistStruct final : public WithDeclsToAdd, public WithGuards {
99 /// Flattens nested struct types
100 static void hoistStruct( std::list< Declaration * > &translationUnit );
101
102 void previsit( StructDecl * aggregateDecl );
103 void previsit( UnionDecl * aggregateDecl );
104 void previsit( StaticAssertDecl * assertDecl );
105 void previsit( StructInstType * type );
106 void previsit( UnionInstType * type );
107 void previsit( EnumInstType * type );
108
109 private:
110 template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl );
111
112 AggregateDecl * parentAggr = nullptr;
113 };
114
115 /// Fix return types so that every function returns exactly one value
116 struct ReturnTypeFixer {
117 static void fix( std::list< Declaration * > &translationUnit );
118
119 void postvisit( FunctionDecl * functionDecl );
120 void postvisit( FunctionType * ftype );
121 };
122
123 /// Replaces enum types by int, and function or array types in function parameter and return lists by appropriate pointers.
124 struct EnumAndPointerDecay {
125 void previsit( EnumDecl *aggregateDecl );
126 void previsit( FunctionType *func );
127 };
128
129 /// Associates forward declarations of aggregates with their definitions
130 struct LinkReferenceToTypes final : public WithIndexer, public WithGuards, public WithVisitorRef<LinkReferenceToTypes>, public WithShortCircuiting {
131 LinkReferenceToTypes( const Indexer *indexer );
132 void postvisit( TypeInstType *typeInst );
133
134 void postvisit( EnumInstType *enumInst );
135 void postvisit( StructInstType *structInst );
136 void postvisit( UnionInstType *unionInst );
137 void postvisit( TraitInstType *traitInst );
138 void previsit( QualifiedType * qualType );
139 void postvisit( QualifiedType * qualType );
140
141 void postvisit( EnumDecl *enumDecl );
142 void postvisit( StructDecl *structDecl );
143 void postvisit( UnionDecl *unionDecl );
144 void postvisit( TraitDecl * traitDecl );
145
146 void previsit( StructDecl *structDecl );
147 void previsit( UnionDecl *unionDecl );
148
149 void renameGenericParams( std::list< TypeDecl * > & params );
150
151 private:
152 const Indexer *local_indexer;
153
154 typedef std::map< std::string, std::list< EnumInstType * > > ForwardEnumsType;
155 typedef std::map< std::string, std::list< StructInstType * > > ForwardStructsType;
156 typedef std::map< std::string, std::list< UnionInstType * > > ForwardUnionsType;
157 ForwardEnumsType forwardEnums;
158 ForwardStructsType forwardStructs;
159 ForwardUnionsType forwardUnions;
160 /// true if currently in a generic type body, so that type parameter instances can be renamed appropriately
161 bool inGeneric = false;
162 };
163
164 /// Replaces array and function types in forall lists by appropriate pointer type and assigns each Object and Function declaration a unique ID.
165 struct ForallPointerDecay final {
166 void previsit( ObjectDecl * object );
167 void previsit( FunctionDecl * func );
168 void previsit( FunctionType * ftype );
169 void previsit( StructDecl * aggrDecl );
170 void previsit( UnionDecl * aggrDecl );
171 };
172
173 struct ReturnChecker : public WithGuards {
174 /// Checks that return statements return nothing if their return type is void
175 /// and return something if the return type is non-void.
176 static void checkFunctionReturns( std::list< Declaration * > & translationUnit );
177
178 void previsit( FunctionDecl * functionDecl );
179 void previsit( ReturnStmt * returnStmt );
180
181 typedef std::list< DeclarationWithType * > ReturnVals;
182 ReturnVals returnVals;
183 };
184
185 struct ReplaceTypedef final : public WithVisitorRef<ReplaceTypedef>, public WithGuards, public WithShortCircuiting, public WithDeclsToAdd {
186 ReplaceTypedef() : scopeLevel( 0 ) {}
187 /// Replaces typedefs by forward declarations
188 static void replaceTypedef( std::list< Declaration * > &translationUnit );
189
190 void premutate( QualifiedType * );
191 Type * postmutate( QualifiedType * qualType );
192 Type * postmutate( TypeInstType * aggregateUseType );
193 Declaration * postmutate( TypedefDecl * typeDecl );
194 void premutate( TypeDecl * typeDecl );
195 void premutate( FunctionDecl * funcDecl );
196 void premutate( ObjectDecl * objDecl );
197 DeclarationWithType * postmutate( ObjectDecl * objDecl );
198
199 void premutate( CastExpr * castExpr );
200
201 void premutate( CompoundStmt * compoundStmt );
202
203 void premutate( StructDecl * structDecl );
204 void premutate( UnionDecl * unionDecl );
205 void premutate( EnumDecl * enumDecl );
206 void premutate( TraitDecl * );
207
208 void premutate( FunctionType * ftype );
209
210 private:
211 template<typename AggDecl>
212 void addImplicitTypedef( AggDecl * aggDecl );
213 template< typename AggDecl >
214 void handleAggregate( AggDecl * aggr );
215
216 typedef std::unique_ptr<TypedefDecl> TypedefDeclPtr;
217 typedef ScopedMap< std::string, std::pair< TypedefDeclPtr, int > > TypedefMap;
218 typedef ScopedMap< std::string, TypeDecl * > TypeDeclMap;
219 TypedefMap typedefNames;
220 TypeDeclMap typedeclNames;
221 int scopeLevel;
222 bool inFunctionType = false;
223 };
224
225 struct EliminateTypedef {
226 /// removes TypedefDecls from the AST
227 static void eliminateTypedef( std::list< Declaration * > &translationUnit );
228
229 template<typename AggDecl>
230 void handleAggregate( AggDecl *aggregateDecl );
231
232 void previsit( StructDecl * aggregateDecl );
233 void previsit( UnionDecl * aggregateDecl );
234 void previsit( CompoundStmt * compoundStmt );
235 };
236
237 struct VerifyCtorDtorAssign {
238 /// ensure that constructors, destructors, and assignment have at least one
239 /// parameter, the first of which must be a pointer, and that ctor/dtors have no
240 /// return values.
241 static void verify( std::list< Declaration * > &translationUnit );
242
243 void previsit( FunctionDecl *funcDecl );
244 };
245
246 /// ensure that generic types have the correct number of type arguments
247 struct ValidateGenericParameters {
248 void previsit( StructInstType * inst );
249 void previsit( UnionInstType * inst );
250 };
251
252 struct FixObjectType : public WithIndexer {
253 /// resolves typeof type in object, function, and type declarations
254 static void fix( std::list< Declaration * > & translationUnit );
255
256 void previsit( ObjectDecl * );
257 void previsit( FunctionDecl * );
258 void previsit( TypeDecl * );
259 };
260
261 struct ArrayLength : public WithIndexer {
262 /// for array types without an explicit length, compute the length and store it so that it
263 /// is known to the rest of the phases. For example,
264 /// int x[] = { 1, 2, 3 };
265 /// int y[][2] = { { 1, 2, 3 }, { 1, 2, 3 } };
266 /// here x and y are known at compile-time to have length 3, so change this into
267 /// int x[3] = { 1, 2, 3 };
268 /// int y[3][2] = { { 1, 2, 3 }, { 1, 2, 3 } };
269 static void computeLength( std::list< Declaration * > & translationUnit );
270
271 void previsit( ObjectDecl * objDecl );
272 void previsit( ArrayType * arrayType );
273 };
274
275 struct CompoundLiteral final : public WithDeclsToAdd, public WithVisitorRef<CompoundLiteral> {
276 Type::StorageClasses storageClasses;
277
278 void premutate( ObjectDecl *objectDecl );
279 Expression * postmutate( CompoundLiteralExpr *compLitExpr );
280 };
281
282 struct LabelAddressFixer final : public WithGuards {
283 std::set< Label > labels;
284
285 void premutate( FunctionDecl * funcDecl );
286 Expression * postmutate( AddressExpr * addrExpr );
287 };
288
289 FunctionDecl * dereferenceOperator = nullptr;
290 struct FindSpecialDeclarations final {
291 void previsit( FunctionDecl * funcDecl );
292 };
293
294 void validate( std::list< Declaration * > &translationUnit, __attribute__((unused)) bool doDebug ) {
295 PassVisitor<EnumAndPointerDecay> epc;
296 PassVisitor<LinkReferenceToTypes> lrt( nullptr );
297 PassVisitor<ForallPointerDecay> fpd;
298 PassVisitor<CompoundLiteral> compoundliteral;
299 PassVisitor<ValidateGenericParameters> genericParams;
300 PassVisitor<FindSpecialDeclarations> finder;
301 PassVisitor<LabelAddressFixer> labelAddrFixer;
302 PassVisitor<HoistTypeDecls> hoistDecls;
303 PassVisitor<FixQualifiedTypes> fixQual;
304
305 acceptAll( translationUnit, hoistDecls );
306 ReplaceTypedef::replaceTypedef( translationUnit );
307 ReturnTypeFixer::fix( translationUnit ); // must happen before autogen
308 acceptAll( translationUnit, epc ); // must happen before VerifyCtorDtorAssign, because void return objects should not exist; before LinkReferenceToTypes because it is an indexer and needs correct types for mangling
309 acceptAll( translationUnit, lrt ); // must happen before autogen, because sized flag needs to propagate to generated functions
310 mutateAll( translationUnit, fixQual ); // must happen after LinkReferenceToTypes, because aggregate members are accessed
311 HoistStruct::hoistStruct( translationUnit ); // must happen after EliminateTypedef, so that aggregate typedefs occur in the correct order
312 EliminateTypedef::eliminateTypedef( translationUnit ); //
313 acceptAll( translationUnit, genericParams ); // check as early as possible - can't happen before LinkReferenceToTypes
314 VerifyCtorDtorAssign::verify( translationUnit ); // must happen before autogen, because autogen examines existing ctor/dtors
315 ReturnChecker::checkFunctionReturns( translationUnit );
316 InitTweak::fixReturnStatements( translationUnit ); // must happen before autogen
317 Concurrency::applyKeywords( translationUnit );
318 acceptAll( translationUnit, fpd ); // must happen before autogenerateRoutines, after Concurrency::applyKeywords because uniqueIds must be set on declaration before resolution
319 ControlStruct::hoistControlDecls( translationUnit ); // hoist initialization out of for statements; must happen before autogenerateRoutines
320 autogenerateRoutines( translationUnit ); // moved up, used to be below compoundLiteral - currently needs EnumAndPointerDecay
321 Concurrency::implementMutexFuncs( translationUnit );
322 Concurrency::implementThreadStarter( translationUnit );
323 mutateAll( translationUnit, compoundliteral );
324 ResolvExpr::resolveWithExprs( translationUnit ); // must happen before FixObjectType because user-code is resolved and may contain with variables
325 FixObjectType::fix( translationUnit );
326 ArrayLength::computeLength( translationUnit );
327 acceptAll( translationUnit, finder ); // xxx - remove this pass soon
328 mutateAll( translationUnit, labelAddrFixer );
329 Validate::handleAttributes( translationUnit );
330 }
331
332 void validateType( Type *type, const Indexer *indexer ) {
333 PassVisitor<EnumAndPointerDecay> epc;
334 PassVisitor<LinkReferenceToTypes> lrt( indexer );
335 PassVisitor<ForallPointerDecay> fpd;
336 type->accept( epc );
337 type->accept( lrt );
338 type->accept( fpd );
339 }
340
341
342 void HoistTypeDecls::handleType( Type * type ) {
343 // some type declarations are buried in expressions and not easy to hoist during parsing; hoist them here
344 AggregateDecl * aggr = nullptr;
345 if ( StructInstType * inst = dynamic_cast< StructInstType * >( type ) ) {
346 aggr = inst->baseStruct;
347 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( type ) ) {
348 aggr = inst->baseUnion;
349 } else if ( EnumInstType * inst = dynamic_cast< EnumInstType * >( type ) ) {
350 aggr = inst->baseEnum;
351 }
352 if ( aggr && aggr->body ) {
353 declsToAddBefore.push_front( aggr );
354 }
355 }
356
357 void HoistTypeDecls::previsit( SizeofExpr * expr ) {
358 handleType( expr->type );
359 }
360
361 void HoistTypeDecls::previsit( AlignofExpr * expr ) {
362 handleType( expr->type );
363 }
364
365 void HoistTypeDecls::previsit( UntypedOffsetofExpr * expr ) {
366 handleType( expr->type );
367 }
368
369 void HoistTypeDecls::previsit( CompoundLiteralExpr * expr ) {
370 handleType( expr->result );
371 }
372
373
374 Type * FixQualifiedTypes::postmutate( QualifiedType * qualType ) {
375 Type * parent = qualType->parent;
376 Type * child = qualType->child;
377 if ( dynamic_cast< GlobalScopeType * >( qualType->parent ) ) {
378 // .T => lookup T at global scope
379 if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( child ) ) {
380 auto td = indexer.globalLookupType( inst->name );
381 if ( ! td ) {
382 SemanticError( qualType->location, toString("Use of undefined global type ", inst->name) );
383 }
384 auto base = td->base;
385 assert( base );
386 Type * ret = base->clone();
387 ret->get_qualifiers() = qualType->get_qualifiers();
388 return ret;
389 } else {
390 // .T => T is not a type name
391 assertf( false, "unhandled global qualified child type: %s", toCString(child) );
392 }
393 } else {
394 // S.T => S must be an aggregate type, find the declaration for T in S.
395 AggregateDecl * aggr = nullptr;
396 if ( StructInstType * inst = dynamic_cast< StructInstType * >( parent ) ) {
397 aggr = inst->baseStruct;
398 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * > ( parent ) ) {
399 aggr = inst->baseUnion;
400 } else {
401 SemanticError( qualType->location, toString("Qualified type requires an aggregate on the left, but has: ", parent) );
402 }
403 assert( aggr ); // TODO: need to handle forward declarations
404 for ( Declaration * member : aggr->members ) {
405 if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( child ) ) {
406 // name on the right is a typedef
407 if ( NamedTypeDecl * aggr = dynamic_cast< NamedTypeDecl * > ( member ) ) {
408 if ( aggr->name == inst->name ) {
409 assert( aggr->base );
410 Type * ret = aggr->base->clone();
411 ret->get_qualifiers() = qualType->get_qualifiers();
412 TypeSubstitution sub = parent->genericSubstitution();
413 sub.apply(ret);
414 return ret;
415 }
416 }
417 } else {
418 // S.T - S is not an aggregate => error
419 assertf( false, "unhandled qualified child type: %s", toCString(qualType) );
420 }
421 }
422 // failed to find a satisfying definition of type
423 SemanticError( qualType->location, toString("Undefined type in qualified type: ", qualType) );
424 }
425
426 // ... may want to link canonical SUE definition to each forward decl so that it becomes easier to lookup?
427 }
428
429
430 void HoistStruct::hoistStruct( std::list< Declaration * > &translationUnit ) {
431 PassVisitor<HoistStruct> hoister;
432 acceptAll( translationUnit, hoister );
433 }
434
435 bool shouldHoist( Declaration *decl ) {
436 return dynamic_cast< StructDecl * >( decl ) || dynamic_cast< UnionDecl * >( decl ) || dynamic_cast< StaticAssertDecl * >( decl );
437 }
438
439 namespace {
440 void qualifiedName( AggregateDecl * aggr, std::ostringstream & ss ) {
441 if ( aggr->parent ) qualifiedName( aggr->parent, ss );
442 ss << "__" << aggr->name;
443 }
444
445 // mangle nested type names using entire parent chain
446 std::string qualifiedName( AggregateDecl * aggr ) {
447 std::ostringstream ss;
448 qualifiedName( aggr, ss );
449 return ss.str();
450 }
451 }
452
453 template< typename AggDecl >
454 void HoistStruct::handleAggregate( AggDecl *aggregateDecl ) {
455 if ( parentAggr ) {
456 aggregateDecl->parent = parentAggr;
457 aggregateDecl->name = qualifiedName( aggregateDecl );
458 // Add elements in stack order corresponding to nesting structure.
459 declsToAddBefore.push_front( aggregateDecl );
460 } else {
461 GuardValue( parentAggr );
462 parentAggr = aggregateDecl;
463 } // if
464 // Always remove the hoisted aggregate from the inner structure.
465 GuardAction( [aggregateDecl]() { filter( aggregateDecl->members, shouldHoist, false ); } );
466 }
467
468 void HoistStruct::previsit( StaticAssertDecl * assertDecl ) {
469 if ( parentAggr ) {
470 declsToAddBefore.push_back( assertDecl );
471 }
472 }
473
474 void HoistStruct::previsit( StructDecl * aggregateDecl ) {
475 handleAggregate( aggregateDecl );
476 }
477
478 void HoistStruct::previsit( UnionDecl * aggregateDecl ) {
479 handleAggregate( aggregateDecl );
480 }
481
482 void HoistStruct::previsit( StructInstType * type ) {
483 // need to reset type name after expanding to qualified name
484 assert( type->baseStruct );
485 type->name = type->baseStruct->name;
486 }
487
488 void HoistStruct::previsit( UnionInstType * type ) {
489 assert( type->baseUnion );
490 type->name = type->baseUnion->name;
491 }
492
493 void HoistStruct::previsit( EnumInstType * type ) {
494 assert( type->baseEnum );
495 type->name = type->baseEnum->name;
496 }
497
498
499 bool isTypedef( Declaration *decl ) {
500 return dynamic_cast< TypedefDecl * >( decl );
501 }
502
503 void EliminateTypedef::eliminateTypedef( std::list< Declaration * > &translationUnit ) {
504 PassVisitor<EliminateTypedef> eliminator;
505 acceptAll( translationUnit, eliminator );
506 filter( translationUnit, isTypedef, true );
507 }
508
509 template< typename AggDecl >
510 void EliminateTypedef::handleAggregate( AggDecl *aggregateDecl ) {
511 filter( aggregateDecl->members, isTypedef, true );
512 }
513
514 void EliminateTypedef::previsit( StructDecl * aggregateDecl ) {
515 handleAggregate( aggregateDecl );
516 }
517
518 void EliminateTypedef::previsit( UnionDecl * aggregateDecl ) {
519 handleAggregate( aggregateDecl );
520 }
521
522 void EliminateTypedef::previsit( CompoundStmt * compoundStmt ) {
523 // remove and delete decl stmts
524 filter( compoundStmt->kids, [](Statement * stmt) {
525 if ( DeclStmt *declStmt = dynamic_cast< DeclStmt * >( stmt ) ) {
526 if ( dynamic_cast< TypedefDecl * >( declStmt->decl ) ) {
527 return true;
528 } // if
529 } // if
530 return false;
531 }, true);
532 }
533
534 void EnumAndPointerDecay::previsit( EnumDecl *enumDecl ) {
535 // Set the type of each member of the enumeration to be EnumConstant
536 for ( std::list< Declaration * >::iterator i = enumDecl->members.begin(); i != enumDecl->members.end(); ++i ) {
537 ObjectDecl * obj = dynamic_cast< ObjectDecl * >( *i );
538 assert( obj );
539 obj->set_type( new EnumInstType( Type::Qualifiers( Type::Const ), enumDecl->name ) );
540 } // for
541 }
542
543 namespace {
544 template< typename DWTList >
545 void fixFunctionList( DWTList & dwts, bool isVarArgs, FunctionType * func ) {
546 auto nvals = dwts.size();
547 bool containsVoid = false;
548 for ( auto & dwt : dwts ) {
549 // fix each DWT and record whether a void was found
550 containsVoid |= fixFunction( dwt );
551 }
552
553 // the only case in which "void" is valid is where it is the only one in the list
554 if ( containsVoid && ( nvals > 1 || isVarArgs ) ) {
555 SemanticError( func, "invalid type void in function type " );
556 }
557
558 // one void is the only thing in the list; remove it.
559 if ( containsVoid ) {
560 delete dwts.front();
561 dwts.clear();
562 }
563 }
564 }
565
566 void EnumAndPointerDecay::previsit( FunctionType *func ) {
567 // Fix up parameters and return types
568 fixFunctionList( func->parameters, func->isVarArgs, func );
569 fixFunctionList( func->returnVals, false, func );
570 }
571
572 LinkReferenceToTypes::LinkReferenceToTypes( const Indexer *other_indexer ) {
573 if ( other_indexer ) {
574 local_indexer = other_indexer;
575 } else {
576 local_indexer = &indexer;
577 } // if
578 }
579
580 void LinkReferenceToTypes::postvisit( EnumInstType *enumInst ) {
581 EnumDecl *st = local_indexer->lookupEnum( enumInst->name );
582 // it's not a semantic error if the enum is not found, just an implicit forward declaration
583 if ( st ) {
584 enumInst->baseEnum = st;
585 } // if
586 if ( ! st || ! st->body ) {
587 // use of forward declaration
588 forwardEnums[ enumInst->name ].push_back( enumInst );
589 } // if
590 }
591
592 void checkGenericParameters( ReferenceToType * inst ) {
593 for ( Expression * param : inst->parameters ) {
594 if ( ! dynamic_cast< TypeExpr * >( param ) ) {
595 SemanticError( inst, "Expression parameters for generic types are currently unsupported: " );
596 }
597 }
598 }
599
600 void LinkReferenceToTypes::postvisit( StructInstType *structInst ) {
601 StructDecl *st = local_indexer->lookupStruct( structInst->name );
602 // it's not a semantic error if the struct is not found, just an implicit forward declaration
603 if ( st ) {
604 structInst->baseStruct = st;
605 } // if
606 if ( ! st || ! st->body ) {
607 // use of forward declaration
608 forwardStructs[ structInst->name ].push_back( structInst );
609 } // if
610 checkGenericParameters( structInst );
611 }
612
613 void LinkReferenceToTypes::postvisit( UnionInstType *unionInst ) {
614 UnionDecl *un = local_indexer->lookupUnion( unionInst->name );
615 // it's not a semantic error if the union is not found, just an implicit forward declaration
616 if ( un ) {
617 unionInst->baseUnion = un;
618 } // if
619 if ( ! un || ! un->body ) {
620 // use of forward declaration
621 forwardUnions[ unionInst->name ].push_back( unionInst );
622 } // if
623 checkGenericParameters( unionInst );
624 }
625
626 void LinkReferenceToTypes::previsit( QualifiedType * ) {
627 visit_children = false;
628 }
629
630 void LinkReferenceToTypes::postvisit( QualifiedType * qualType ) {
631 // linking only makes sense for the 'oldest ancestor' of the qualified type
632 qualType->parent->accept( *visitor );
633 }
634
635 template< typename Decl >
636 void normalizeAssertions( std::list< Decl * > & assertions ) {
637 // ensure no duplicate trait members after the clone
638 auto pred = [](Decl * d1, Decl * d2) {
639 // only care if they're equal
640 DeclarationWithType * dwt1 = dynamic_cast<DeclarationWithType *>( d1 );
641 DeclarationWithType * dwt2 = dynamic_cast<DeclarationWithType *>( d2 );
642 if ( dwt1 && dwt2 ) {
643 if ( dwt1->name == dwt2->name && ResolvExpr::typesCompatible( dwt1->get_type(), dwt2->get_type(), SymTab::Indexer() ) ) {
644 // std::cerr << "=========== equal:" << std::endl;
645 // std::cerr << "d1: " << d1 << std::endl;
646 // std::cerr << "d2: " << d2 << std::endl;
647 return false;
648 }
649 }
650 return d1 < d2;
651 };
652 std::set<Decl *, decltype(pred)> unique_members( assertions.begin(), assertions.end(), pred );
653 // if ( unique_members.size() != assertions.size() ) {
654 // std::cerr << "============different" << std::endl;
655 // std::cerr << unique_members.size() << " " << assertions.size() << std::endl;
656 // }
657
658 std::list< Decl * > order;
659 order.splice( order.end(), assertions );
660 std::copy_if( order.begin(), order.end(), back_inserter( assertions ), [&]( Decl * decl ) {
661 return unique_members.count( decl );
662 });
663 }
664
665 // expand assertions from trait instance, performing the appropriate type variable substitutions
666 template< typename Iterator >
667 void expandAssertions( TraitInstType * inst, Iterator out ) {
668 assertf( inst->baseTrait, "Trait instance not linked to base trait: %s", toCString( inst ) );
669 std::list< DeclarationWithType * > asserts;
670 for ( Declaration * decl : inst->baseTrait->members ) {
671 asserts.push_back( strict_dynamic_cast<DeclarationWithType *>( decl->clone() ) );
672 }
673 // substitute trait decl parameters for instance parameters
674 applySubstitution( inst->baseTrait->parameters.begin(), inst->baseTrait->parameters.end(), inst->parameters.begin(), asserts.begin(), asserts.end(), out );
675 }
676
677 void LinkReferenceToTypes::postvisit( TraitDecl * traitDecl ) {
678 if ( traitDecl->name == "sized" ) {
679 // "sized" is a special trait - flick the sized status on for the type variable
680 assertf( traitDecl->parameters.size() == 1, "Built-in trait 'sized' has incorrect number of parameters: %zd", traitDecl->parameters.size() );
681 TypeDecl * td = traitDecl->parameters.front();
682 td->set_sized( true );
683 }
684
685 // move assertions from type parameters into the body of the trait
686 for ( TypeDecl * td : traitDecl->parameters ) {
687 for ( DeclarationWithType * assert : td->assertions ) {
688 if ( TraitInstType * inst = dynamic_cast< TraitInstType * >( assert->get_type() ) ) {
689 expandAssertions( inst, back_inserter( traitDecl->members ) );
690 } else {
691 traitDecl->members.push_back( assert->clone() );
692 }
693 }
694 deleteAll( td->assertions );
695 td->assertions.clear();
696 } // for
697 }
698
699 void LinkReferenceToTypes::postvisit( TraitInstType * traitInst ) {
700 // handle other traits
701 TraitDecl *traitDecl = local_indexer->lookupTrait( traitInst->name );
702 if ( ! traitDecl ) {
703 SemanticError( traitInst->location, "use of undeclared trait " + traitInst->name );
704 } // if
705 if ( traitDecl->parameters.size() != traitInst->parameters.size() ) {
706 SemanticError( traitInst, "incorrect number of trait parameters: " );
707 } // if
708 traitInst->baseTrait = traitDecl;
709
710 // need to carry over the 'sized' status of each decl in the instance
711 for ( auto p : group_iterate( traitDecl->parameters, traitInst->parameters ) ) {
712 TypeExpr * expr = dynamic_cast< TypeExpr * >( std::get<1>(p) );
713 if ( ! expr ) {
714 SemanticError( std::get<1>(p), "Expression parameters for trait instances are currently unsupported: " );
715 }
716 if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( expr->get_type() ) ) {
717 TypeDecl * formalDecl = std::get<0>(p);
718 TypeDecl * instDecl = inst->baseType;
719 if ( formalDecl->get_sized() ) instDecl->set_sized( true );
720 }
721 }
722 // normalizeAssertions( traitInst->members );
723 }
724
725 void LinkReferenceToTypes::postvisit( EnumDecl *enumDecl ) {
726 // visit enum members first so that the types of self-referencing members are updated properly
727 if ( enumDecl->body ) {
728 ForwardEnumsType::iterator fwds = forwardEnums.find( enumDecl->name );
729 if ( fwds != forwardEnums.end() ) {
730 for ( std::list< EnumInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
731 (*inst)->baseEnum = enumDecl;
732 } // for
733 forwardEnums.erase( fwds );
734 } // if
735
736 for ( Declaration * member : enumDecl->members ) {
737 ObjectDecl * field = strict_dynamic_cast<ObjectDecl *>( member );
738 if ( field->init ) {
739 // need to resolve enumerator initializers early so that other passes that determine if an expression is constexpr have the appropriate information.
740 SingleInit * init = strict_dynamic_cast<SingleInit *>( field->init );
741 ResolvExpr::findSingleExpression( init->value, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), indexer );
742 }
743 }
744 } // if
745 }
746
747 void LinkReferenceToTypes::renameGenericParams( std::list< TypeDecl * > & params ) {
748 // rename generic type parameters uniquely so that they do not conflict with user-defined function forall parameters, e.g.
749 // forall(otype T)
750 // struct Box {
751 // T x;
752 // };
753 // forall(otype T)
754 // void f(Box(T) b) {
755 // ...
756 // }
757 // The T in Box and the T in f are different, so internally the naming must reflect that.
758 GuardValue( inGeneric );
759 inGeneric = ! params.empty();
760 for ( TypeDecl * td : params ) {
761 td->name = "__" + td->name + "_generic_";
762 }
763 }
764
765 void LinkReferenceToTypes::previsit( StructDecl * structDecl ) {
766 renameGenericParams( structDecl->parameters );
767 }
768
769 void LinkReferenceToTypes::previsit( UnionDecl * unionDecl ) {
770 renameGenericParams( unionDecl->parameters );
771 }
772
773 void LinkReferenceToTypes::postvisit( StructDecl *structDecl ) {
774 // visit struct members first so that the types of self-referencing members are updated properly
775 // xxx - need to ensure that type parameters match up between forward declarations and definition (most importantly, number of type parameters and their defaults)
776 if ( structDecl->body ) {
777 ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->name );
778 if ( fwds != forwardStructs.end() ) {
779 for ( std::list< StructInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
780 (*inst)->baseStruct = structDecl;
781 } // for
782 forwardStructs.erase( fwds );
783 } // if
784 } // if
785 }
786
787 void LinkReferenceToTypes::postvisit( UnionDecl *unionDecl ) {
788 if ( unionDecl->body ) {
789 ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->name );
790 if ( fwds != forwardUnions.end() ) {
791 for ( std::list< UnionInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
792 (*inst)->baseUnion = unionDecl;
793 } // for
794 forwardUnions.erase( fwds );
795 } // if
796 } // if
797 }
798
799 void LinkReferenceToTypes::postvisit( TypeInstType *typeInst ) {
800 // ensure generic parameter instances are renamed like the base type
801 if ( inGeneric && typeInst->baseType ) typeInst->name = typeInst->baseType->name;
802 if ( NamedTypeDecl *namedTypeDecl = local_indexer->lookupType( typeInst->name ) ) {
803 if ( TypeDecl *typeDecl = dynamic_cast< TypeDecl * >( namedTypeDecl ) ) {
804 typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype );
805 } // if
806 } // if
807 }
808
809 /// Fix up assertions - flattens assertion lists, removing all trait instances
810 void forallFixer( std::list< TypeDecl * > & forall, BaseSyntaxNode * node ) {
811 for ( TypeDecl * type : forall ) {
812 std::list< DeclarationWithType * > asserts;
813 asserts.splice( asserts.end(), type->assertions );
814 // expand trait instances into their members
815 for ( DeclarationWithType * assertion : asserts ) {
816 if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) {
817 // expand trait instance into all of its members
818 expandAssertions( traitInst, back_inserter( type->assertions ) );
819 delete traitInst;
820 } else {
821 // pass other assertions through
822 type->assertions.push_back( assertion );
823 } // if
824 } // for
825 // apply FixFunction to every assertion to check for invalid void type
826 for ( DeclarationWithType *& assertion : type->assertions ) {
827 bool isVoid = fixFunction( assertion );
828 if ( isVoid ) {
829 SemanticError( node, "invalid type void in assertion of function " );
830 } // if
831 } // for
832 // normalizeAssertions( type->assertions );
833 } // for
834 }
835
836 void ForallPointerDecay::previsit( ObjectDecl *object ) {
837 // ensure that operator names only apply to functions or function pointers
838 if ( CodeGen::isOperator( object->name ) && ! dynamic_cast< FunctionType * >( object->type->stripDeclarator() ) ) {
839 SemanticError( object->location, toCString( "operator ", object->name.c_str(), " is not a function or function pointer." ) );
840 }
841 object->fixUniqueId();
842 }
843
844 void ForallPointerDecay::previsit( FunctionDecl *func ) {
845 func->fixUniqueId();
846 }
847
848 void ForallPointerDecay::previsit( FunctionType * ftype ) {
849 forallFixer( ftype->forall, ftype );
850 }
851
852 void ForallPointerDecay::previsit( StructDecl * aggrDecl ) {
853 forallFixer( aggrDecl->parameters, aggrDecl );
854 }
855
856 void ForallPointerDecay::previsit( UnionDecl * aggrDecl ) {
857 forallFixer( aggrDecl->parameters, aggrDecl );
858 }
859
860 void ReturnChecker::checkFunctionReturns( std::list< Declaration * > & translationUnit ) {
861 PassVisitor<ReturnChecker> checker;
862 acceptAll( translationUnit, checker );
863 }
864
865 void ReturnChecker::previsit( FunctionDecl * functionDecl ) {
866 GuardValue( returnVals );
867 returnVals = functionDecl->get_functionType()->get_returnVals();
868 }
869
870 void ReturnChecker::previsit( ReturnStmt * returnStmt ) {
871 // Previously this also checked for the existence of an expr paired with no return values on
872 // the function return type. This is incorrect, since you can have an expression attached to
873 // a return statement in a void-returning function in C. The expression is treated as if it
874 // were cast to void.
875 if ( ! returnStmt->get_expr() && returnVals.size() != 0 ) {
876 SemanticError( returnStmt, "Non-void function returns no values: " );
877 }
878 }
879
880
881 void ReplaceTypedef::replaceTypedef( std::list< Declaration * > &translationUnit ) {
882 PassVisitor<ReplaceTypedef> eliminator;
883 mutateAll( translationUnit, eliminator );
884 if ( eliminator.pass.typedefNames.count( "size_t" ) ) {
885 // grab and remember declaration of size_t
886 SizeType = eliminator.pass.typedefNames["size_t"].first->base->clone();
887 } else {
888 // xxx - missing global typedef for size_t - default to long unsigned int, even though that may be wrong
889 // eventually should have a warning for this case.
890 SizeType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
891 }
892 }
893
894 void ReplaceTypedef::premutate( QualifiedType * ) {
895 visit_children = false;
896 }
897
898 Type * ReplaceTypedef::postmutate( QualifiedType * qualType ) {
899 // replacing typedefs only makes sense for the 'oldest ancestor' of the qualified type
900 qualType->parent = qualType->parent->acceptMutator( *visitor );
901 return qualType;
902 }
903
904 Type * ReplaceTypedef::postmutate( TypeInstType * typeInst ) {
905 // instances of typedef types will come here. If it is an instance
906 // of a typdef type, link the instance to its actual type.
907 TypedefMap::const_iterator def = typedefNames.find( typeInst->name );
908 if ( def != typedefNames.end() ) {
909 Type *ret = def->second.first->base->clone();
910 ret->location = typeInst->location;
911 ret->get_qualifiers() |= typeInst->get_qualifiers();
912 // attributes are not carried over from typedef to function parameters/return values
913 if ( ! inFunctionType ) {
914 ret->attributes.splice( ret->attributes.end(), typeInst->attributes );
915 } else {
916 deleteAll( ret->attributes );
917 ret->attributes.clear();
918 }
919 // place instance parameters on the typedef'd type
920 if ( ! typeInst->parameters.empty() ) {
921 ReferenceToType *rtt = dynamic_cast<ReferenceToType*>(ret);
922 if ( ! rtt ) {
923 SemanticError( typeInst->location, "Cannot apply type parameters to base type of " + typeInst->name );
924 }
925 rtt->parameters.clear();
926 cloneAll( typeInst->parameters, rtt->parameters );
927 mutateAll( rtt->parameters, *visitor ); // recursively fix typedefs on parameters
928 } // if
929 delete typeInst;
930 return ret;
931 } else {
932 TypeDeclMap::const_iterator base = typedeclNames.find( typeInst->name );
933 if ( base == typedeclNames.end() ) {
934 SemanticError( typeInst->location, toString("Use of undefined type ", typeInst->name) );
935 }
936 typeInst->set_baseType( base->second );
937 return typeInst;
938 } // if
939 assert( false );
940 }
941
942 struct VarLenChecker : WithShortCircuiting {
943 void previsit( FunctionType * ) { visit_children = false; }
944 void previsit( ArrayType * at ) {
945 isVarLen |= at->isVarLen;
946 }
947 bool isVarLen = false;
948 };
949
950 bool isVariableLength( Type * t ) {
951 PassVisitor<VarLenChecker> varLenChecker;
952 maybeAccept( t, varLenChecker );
953 return varLenChecker.pass.isVarLen;
954 }
955
956 Declaration * ReplaceTypedef::postmutate( TypedefDecl * tyDecl ) {
957 if ( typedefNames.count( tyDecl->name ) == 1 && typedefNames[ tyDecl->name ].second == scopeLevel ) {
958 // typedef to the same name from the same scope
959 // must be from the same type
960
961 Type * t1 = tyDecl->base;
962 Type * t2 = typedefNames[ tyDecl->name ].first->base;
963 if ( ! ResolvExpr::typesCompatible( t1, t2, Indexer() ) ) {
964 SemanticError( tyDecl->location, "Cannot redefine typedef: " + tyDecl->name );
965 }
966 // Cannot redefine VLA typedefs. Note: this is slightly incorrect, because our notion of VLAs
967 // at this point in the translator is imprecise. In particular, this will disallow redefining typedefs
968 // with arrays whose dimension is an enumerator or a cast of a constant/enumerator. The effort required
969 // to fix this corner case likely outweighs the utility of allowing it.
970 if ( isVariableLength( t1 ) || isVariableLength( t2 ) ) {
971 SemanticError( tyDecl->location, "Cannot redefine typedef: " + tyDecl->name );
972 }
973 } else {
974 typedefNames[ tyDecl->name ] = std::make_pair( TypedefDeclPtr( tyDecl ), scopeLevel );
975 } // if
976
977 // When a typedef is a forward declaration:
978 // typedef struct screen SCREEN;
979 // the declaration portion must be retained:
980 // struct screen;
981 // because the expansion of the typedef is:
982 // void rtn( SCREEN *p ) => void rtn( struct screen *p )
983 // hence the type-name "screen" must be defined.
984 // Note, qualifiers on the typedef are superfluous for the forward declaration.
985
986 Type *designatorType = tyDecl->base->stripDeclarator();
987 if ( StructInstType *aggDecl = dynamic_cast< StructInstType * >( designatorType ) ) {
988 declsToAddBefore.push_back( new StructDecl( aggDecl->name, DeclarationNode::Struct, noAttributes, tyDecl->linkage ) );
989 } else if ( UnionInstType *aggDecl = dynamic_cast< UnionInstType * >( designatorType ) ) {
990 declsToAddBefore.push_back( new UnionDecl( aggDecl->name, noAttributes, tyDecl->linkage ) );
991 } else if ( EnumInstType *enumDecl = dynamic_cast< EnumInstType * >( designatorType ) ) {
992 declsToAddBefore.push_back( new EnumDecl( enumDecl->name, noAttributes, tyDecl->linkage ) );
993 } // if
994 return tyDecl->clone();
995 }
996
997 void ReplaceTypedef::premutate( TypeDecl * typeDecl ) {
998 TypedefMap::iterator i = typedefNames.find( typeDecl->name );
999 if ( i != typedefNames.end() ) {
1000 typedefNames.erase( i ) ;
1001 } // if
1002
1003 typedeclNames.insert( typeDecl->name, typeDecl );
1004 }
1005
1006 void ReplaceTypedef::premutate( FunctionDecl * ) {
1007 GuardScope( typedefNames );
1008 GuardScope( typedeclNames );
1009 }
1010
1011 void ReplaceTypedef::premutate( ObjectDecl * ) {
1012 GuardScope( typedefNames );
1013 GuardScope( typedeclNames );
1014 }
1015
1016 DeclarationWithType * ReplaceTypedef::postmutate( ObjectDecl * objDecl ) {
1017 if ( FunctionType *funtype = dynamic_cast<FunctionType *>( objDecl->type ) ) { // function type?
1018 // replace the current object declaration with a function declaration
1019 FunctionDecl * newDecl = new FunctionDecl( objDecl->name, objDecl->get_storageClasses(), objDecl->linkage, funtype, 0, objDecl->attributes, objDecl->get_funcSpec() );
1020 objDecl->attributes.clear();
1021 objDecl->set_type( nullptr );
1022 delete objDecl;
1023 return newDecl;
1024 } // if
1025 return objDecl;
1026 }
1027
1028 void ReplaceTypedef::premutate( CastExpr * ) {
1029 GuardScope( typedefNames );
1030 GuardScope( typedeclNames );
1031 }
1032
1033 void ReplaceTypedef::premutate( CompoundStmt * ) {
1034 GuardScope( typedefNames );
1035 GuardScope( typedeclNames );
1036 scopeLevel += 1;
1037 GuardAction( [this](){ scopeLevel -= 1; } );
1038 }
1039
1040 template<typename AggDecl>
1041 void ReplaceTypedef::addImplicitTypedef( AggDecl * aggDecl ) {
1042 if ( typedefNames.count( aggDecl->get_name() ) == 0 ) {
1043 Type *type = nullptr;
1044 if ( StructDecl * newDeclStructDecl = dynamic_cast< StructDecl * >( aggDecl ) ) {
1045 type = new StructInstType( Type::Qualifiers(), newDeclStructDecl->get_name() );
1046 } else if ( UnionDecl * newDeclUnionDecl = dynamic_cast< UnionDecl * >( aggDecl ) ) {
1047 type = new UnionInstType( Type::Qualifiers(), newDeclUnionDecl->get_name() );
1048 } else if ( EnumDecl * newDeclEnumDecl = dynamic_cast< EnumDecl * >( aggDecl ) ) {
1049 type = new EnumInstType( Type::Qualifiers(), newDeclEnumDecl->get_name() );
1050 } // if
1051 TypedefDeclPtr tyDecl( new TypedefDecl( aggDecl->get_name(), aggDecl->location, Type::StorageClasses(), type, aggDecl->get_linkage() ) );
1052 typedefNames[ aggDecl->get_name() ] = std::make_pair( std::move( tyDecl ), scopeLevel );
1053 // add the implicit typedef to the AST
1054 declsToAddBefore.push_back( new TypedefDecl( aggDecl->get_name(), aggDecl->location, Type::StorageClasses(), type->clone(), aggDecl->get_linkage() ) );
1055 } // if
1056 }
1057
1058 template< typename AggDecl >
1059 void ReplaceTypedef::handleAggregate( AggDecl * aggr ) {
1060 SemanticErrorException errors;
1061
1062 ValueGuard< std::list<Declaration * > > oldBeforeDecls( declsToAddBefore );
1063 ValueGuard< std::list<Declaration * > > oldAfterDecls ( declsToAddAfter );
1064 declsToAddBefore.clear();
1065 declsToAddAfter.clear();
1066
1067 GuardScope( typedefNames );
1068 GuardScope( typedeclNames );
1069 mutateAll( aggr->parameters, *visitor );
1070
1071 // unroll mutateAll for aggr->members so that implicit typedefs for nested types are added to the aggregate body.
1072 for ( std::list< Declaration * >::iterator i = aggr->members.begin(); i != aggr->members.end(); ++i ) {
1073 if ( !declsToAddAfter.empty() ) { aggr->members.splice( i, declsToAddAfter ); }
1074
1075 try {
1076 *i = maybeMutate( *i, *visitor );
1077 } catch ( SemanticErrorException &e ) {
1078 errors.append( e );
1079 }
1080
1081 if ( !declsToAddBefore.empty() ) { aggr->members.splice( i, declsToAddBefore ); }
1082 }
1083
1084 if ( !declsToAddAfter.empty() ) { aggr->members.splice( aggr->members.end(), declsToAddAfter ); }
1085 if ( !errors.isEmpty() ) { throw errors; }
1086 }
1087
1088 void ReplaceTypedef::premutate( StructDecl * structDecl ) {
1089 visit_children = false;
1090 addImplicitTypedef( structDecl );
1091 handleAggregate( structDecl );
1092 }
1093
1094 void ReplaceTypedef::premutate( UnionDecl * unionDecl ) {
1095 visit_children = false;
1096 addImplicitTypedef( unionDecl );
1097 handleAggregate( unionDecl );
1098 }
1099
1100 void ReplaceTypedef::premutate( EnumDecl * enumDecl ) {
1101 addImplicitTypedef( enumDecl );
1102 }
1103
1104 void ReplaceTypedef::premutate( FunctionType * ) {
1105 GuardValue( inFunctionType );
1106 inFunctionType = true;
1107 }
1108
1109 void ReplaceTypedef::premutate( TraitDecl * ) {
1110 GuardScope( typedefNames );
1111 GuardScope( typedeclNames);
1112 }
1113
1114 void VerifyCtorDtorAssign::verify( std::list< Declaration * > & translationUnit ) {
1115 PassVisitor<VerifyCtorDtorAssign> verifier;
1116 acceptAll( translationUnit, verifier );
1117 }
1118
1119 void VerifyCtorDtorAssign::previsit( FunctionDecl * funcDecl ) {
1120 FunctionType * funcType = funcDecl->get_functionType();
1121 std::list< DeclarationWithType * > &returnVals = funcType->get_returnVals();
1122 std::list< DeclarationWithType * > &params = funcType->get_parameters();
1123
1124 if ( CodeGen::isCtorDtorAssign( funcDecl->get_name() ) ) { // TODO: also check /=, etc.
1125 if ( params.size() == 0 ) {
1126 SemanticError( funcDecl, "Constructors, destructors, and assignment functions require at least one parameter " );
1127 }
1128 ReferenceType * refType = dynamic_cast< ReferenceType * >( params.front()->get_type() );
1129 if ( ! refType ) {
1130 SemanticError( funcDecl, "First parameter of a constructor, destructor, or assignment function must be a reference " );
1131 }
1132 if ( CodeGen::isCtorDtor( funcDecl->get_name() ) && returnVals.size() != 0 ) {
1133 SemanticError( funcDecl, "Constructors and destructors cannot have explicit return values " );
1134 }
1135 }
1136 }
1137
1138 template< typename Aggr >
1139 void validateGeneric( Aggr * inst ) {
1140 std::list< TypeDecl * > * params = inst->get_baseParameters();
1141 if ( params ) {
1142 std::list< Expression * > & args = inst->get_parameters();
1143
1144 // insert defaults arguments when a type argument is missing (currently only supports missing arguments at the end of the list).
1145 // A substitution is used to ensure that defaults are replaced correctly, e.g.,
1146 // forall(otype T, otype alloc = heap_allocator(T)) struct vector;
1147 // vector(int) v;
1148 // after insertion of default values becomes
1149 // vector(int, heap_allocator(T))
1150 // and the substitution is built with T=int so that after substitution, the result is
1151 // vector(int, heap_allocator(int))
1152 TypeSubstitution sub;
1153 auto paramIter = params->begin();
1154 for ( size_t i = 0; paramIter != params->end(); ++paramIter, ++i ) {
1155 if ( i < args.size() ) {
1156 TypeExpr * expr = strict_dynamic_cast< TypeExpr * >( *std::next( args.begin(), i ) );
1157 sub.add( (*paramIter)->get_name(), expr->get_type()->clone() );
1158 } else if ( i == args.size() ) {
1159 Type * defaultType = (*paramIter)->get_init();
1160 if ( defaultType ) {
1161 args.push_back( new TypeExpr( defaultType->clone() ) );
1162 sub.add( (*paramIter)->get_name(), defaultType->clone() );
1163 }
1164 }
1165 }
1166
1167 sub.apply( inst );
1168 if ( args.size() < params->size() ) SemanticError( inst, "Too few type arguments in generic type " );
1169 if ( args.size() > params->size() ) SemanticError( inst, "Too many type arguments in generic type " );
1170 }
1171 }
1172
1173 void ValidateGenericParameters::previsit( StructInstType * inst ) {
1174 validateGeneric( inst );
1175 }
1176
1177 void ValidateGenericParameters::previsit( UnionInstType * inst ) {
1178 validateGeneric( inst );
1179 }
1180
1181 void CompoundLiteral::premutate( ObjectDecl *objectDecl ) {
1182 storageClasses = objectDecl->get_storageClasses();
1183 }
1184
1185 Expression *CompoundLiteral::postmutate( CompoundLiteralExpr *compLitExpr ) {
1186 // transform [storage_class] ... (struct S){ 3, ... };
1187 // into [storage_class] struct S temp = { 3, ... };
1188 static UniqueName indexName( "_compLit" );
1189
1190 ObjectDecl *tempvar = new ObjectDecl( indexName.newName(), storageClasses, LinkageSpec::C, nullptr, compLitExpr->get_result(), compLitExpr->get_initializer() );
1191 compLitExpr->set_result( nullptr );
1192 compLitExpr->set_initializer( nullptr );
1193 delete compLitExpr;
1194 declsToAddBefore.push_back( tempvar ); // add modified temporary to current block
1195 return new VariableExpr( tempvar );
1196 }
1197
1198 void ReturnTypeFixer::fix( std::list< Declaration * > &translationUnit ) {
1199 PassVisitor<ReturnTypeFixer> fixer;
1200 acceptAll( translationUnit, fixer );
1201 }
1202
1203 void ReturnTypeFixer::postvisit( FunctionDecl * functionDecl ) {
1204 FunctionType * ftype = functionDecl->get_functionType();
1205 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
1206 assertf( retVals.size() == 0 || retVals.size() == 1, "Function %s has too many return values: %zu", functionDecl->get_name().c_str(), retVals.size() );
1207 if ( retVals.size() == 1 ) {
1208 // ensure all function return values have a name - use the name of the function to disambiguate (this also provides a nice bit of help for debugging).
1209 // ensure other return values have a name.
1210 DeclarationWithType * ret = retVals.front();
1211 if ( ret->get_name() == "" ) {
1212 ret->set_name( toString( "_retval_", CodeGen::genName( functionDecl ) ) );
1213 }
1214 ret->get_attributes().push_back( new Attribute( "unused" ) );
1215 }
1216 }
1217
1218 void ReturnTypeFixer::postvisit( FunctionType * ftype ) {
1219 // xxx - need to handle named return values - this information needs to be saved somehow
1220 // so that resolution has access to the names.
1221 // Note that this pass needs to happen early so that other passes which look for tuple types
1222 // find them in all of the right places, including function return types.
1223 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
1224 if ( retVals.size() > 1 ) {
1225 // generate a single return parameter which is the tuple of all of the return values
1226 TupleType * tupleType = strict_dynamic_cast< TupleType * >( ResolvExpr::extractResultType( ftype ) );
1227 // ensure return value is not destructed by explicitly creating an empty ListInit node wherein maybeConstruct is false.
1228 ObjectDecl * newRet = new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::Cforall, 0, tupleType, new ListInit( std::list<Initializer*>(), noDesignators, false ) );
1229 deleteAll( retVals );
1230 retVals.clear();
1231 retVals.push_back( newRet );
1232 }
1233 }
1234
1235 void FixObjectType::fix( std::list< Declaration * > & translationUnit ) {
1236 PassVisitor<FixObjectType> fixer;
1237 acceptAll( translationUnit, fixer );
1238 }
1239
1240 void FixObjectType::previsit( ObjectDecl * objDecl ) {
1241 Type *new_type = ResolvExpr::resolveTypeof( objDecl->get_type(), indexer );
1242 new_type->get_qualifiers() -= Type::Lvalue; // even if typeof is lvalue, variable can never have lvalue-qualified type
1243 objDecl->set_type( new_type );
1244 }
1245
1246 void FixObjectType::previsit( FunctionDecl * funcDecl ) {
1247 Type *new_type = ResolvExpr::resolveTypeof( funcDecl->type, indexer );
1248 new_type->get_qualifiers() -= Type::Lvalue; // even if typeof is lvalue, variable can never have lvalue-qualified type
1249 funcDecl->set_type( new_type );
1250 }
1251
1252 void FixObjectType::previsit( TypeDecl *typeDecl ) {
1253 if ( typeDecl->get_base() ) {
1254 Type *new_type = ResolvExpr::resolveTypeof( typeDecl->get_base(), indexer );
1255 new_type->get_qualifiers() -= Type::Lvalue; // even if typeof is lvalue, variable can never have lvalue-qualified type
1256 typeDecl->set_base( new_type );
1257 } // if
1258 }
1259
1260 void ArrayLength::computeLength( std::list< Declaration * > & translationUnit ) {
1261 PassVisitor<ArrayLength> len;
1262 acceptAll( translationUnit, len );
1263 }
1264
1265 void ArrayLength::previsit( ObjectDecl * objDecl ) {
1266 if ( ArrayType * at = dynamic_cast< ArrayType * >( objDecl->type ) ) {
1267 if ( at->dimension ) return;
1268 if ( ListInit * init = dynamic_cast< ListInit * >( objDecl->init ) ) {
1269 at->dimension = new ConstantExpr( Constant::from_ulong( init->initializers.size() ) );
1270 }
1271 }
1272 }
1273
1274 void ArrayLength::previsit( ArrayType * type ) {
1275 if ( type->dimension ) {
1276 // need to resolve array dimensions early so that constructor code can correctly determine
1277 // if a type is a VLA (and hence whether its elements need to be constructed)
1278 ResolvExpr::findSingleExpression( type->dimension, SymTab::SizeType->clone(), indexer );
1279
1280 // must re-evaluate whether a type is a VLA, now that more information is available
1281 // (e.g. the dimension may have been an enumerator, which was unknown prior to this step)
1282 type->isVarLen = ! InitTweak::isConstExpr( type->dimension );
1283 }
1284 }
1285
1286 struct LabelFinder {
1287 std::set< Label > & labels;
1288 LabelFinder( std::set< Label > & labels ) : labels( labels ) {}
1289 void previsit( Statement * stmt ) {
1290 for ( Label & l : stmt->labels ) {
1291 labels.insert( l );
1292 }
1293 }
1294 };
1295
1296 void LabelAddressFixer::premutate( FunctionDecl * funcDecl ) {
1297 GuardValue( labels );
1298 PassVisitor<LabelFinder> finder( labels );
1299 funcDecl->accept( finder );
1300 }
1301
1302 Expression * LabelAddressFixer::postmutate( AddressExpr * addrExpr ) {
1303 // convert &&label into label address
1304 if ( AddressExpr * inner = dynamic_cast< AddressExpr * >( addrExpr->arg ) ) {
1305 if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( inner->arg ) ) {
1306 if ( labels.count( nameExpr->name ) ) {
1307 Label name = nameExpr->name;
1308 delete addrExpr;
1309 return new LabelAddressExpr( name );
1310 }
1311 }
1312 }
1313 return addrExpr;
1314 }
1315
1316 void FindSpecialDeclarations::previsit( FunctionDecl * funcDecl ) {
1317 if ( ! dereferenceOperator ) {
1318 if ( funcDecl->get_name() == "*?" && funcDecl->get_linkage() == LinkageSpec::Intrinsic ) {
1319 FunctionType * ftype = funcDecl->get_functionType();
1320 if ( ftype->get_parameters().size() == 1 && ftype->get_parameters().front()->get_type()->get_qualifiers() == Type::Qualifiers() ) {
1321 dereferenceOperator = funcDecl;
1322 }
1323 }
1324 }
1325 }
1326} // namespace SymTab
1327
1328// Local Variables: //
1329// tab-width: 4 //
1330// mode: c++ //
1331// compile-command: "make install" //
1332// End: //
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