Changeset c8ffe20b for translator/SymTab


Ignore:
Timestamp:
Nov 15, 2014, 10:46:42 PM (10 years ago)
Author:
Peter A. Buhr <pabuhr@…>
Branches:
ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, ctor, deferred_resn, demangler, enum, forall-pointer-decay, gc_noraii, jacob/cs343-translation, jenkins-sandbox, master, memory, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, resolv-new, string, with_gc
Children:
1ead581
Parents:
8c17ab0
Message:

reformat files

File:
1 edited

Legend:

Unmodified
Added
Removed

  • translator/SymTab/Validate.cc

    r8c17ab0 rc8ffe20b  
    11/*
    2  * This file is part of the Cforall project
    3  *
    4  * $Id: Validate.cc,v 1.22 2005/08/29 20:14:18 rcbilson Exp $
    5  *
    6  */
    7 
    8 /*
    9    The "validate" phase of translation is used to take a syntax tree and convert it into a
    10    standard form that aims to be as regular in structure as possible.  Some assumptions can be
    11    made regarding the state of the tree after this pass is complete, including:
    12 
    13    - No nested structure or union definitions; any in the input are "hoisted" to the level of
    14      the containing struct or union.
    15 
    16    - All enumeration constants have type EnumInstType.
    17 
    18    - The type "void" never occurs in lists of function parameter or return types; neither do
    19      tuple types.  A function taking no arguments has no argument types, and tuples are flattened.
    20 
    21    - No context instances exist; they are all replaced by the set of declarations signified by
    22      the context, instantiated by the particular set of type arguments.
    23 
    24    - Every declaration is assigned a unique id.
    25 
    26    - No typedef declarations or instances exist; the actual type is substituted for each instance.
    27 
    28    - Each type, struct, and union definition is followed by an appropriate assignment operator.
    29 
    30    - Each use of a struct or union is connected to a complete definition of that struct or union,
    31      even if that definition occurs later in the input.
     2  The "validate" phase of translation is used to take a syntax tree and convert it into a
     3  standard form that aims to be as regular in structure as possible.  Some assumptions can be
     4  made regarding the state of the tree after this pass is complete, including:
     5
     6  - No nested structure or union definitions; any in the input are "hoisted" to the level of
     7  the containing struct or union.
     8
     9  - All enumeration constants have type EnumInstType.
     10
     11  - The type "void" never occurs in lists of function parameter or return types; neither do
     12  tuple types.  A function taking no arguments has no argument types, and tuples are flattened.
     13
     14  - No context instances exist; they are all replaced by the set of declarations signified by
     15  the context, instantiated by the particular set of type arguments.
     16
     17  - Every declaration is assigned a unique id.
     18
     19  - No typedef declarations or instances exist; the actual type is substituted for each instance.
     20
     21  - Each type, struct, and union definition is followed by an appropriate assignment operator.
     22
     23  - Each use of a struct or union is connected to a complete definition of that struct or union,
     24  even if that definition occurs later in the input.
    3225*/
    3326
    … …  
    4841
    4942
    50 #define debugPrint(x) if( doDebug ) { std::cout << x; }
     43#define debugPrint( x ) if ( doDebug ) { std::cout << x; }
    5144
    5245namespace SymTab {
    53 
    54 class HoistStruct : public Visitor
    55 {
    56 public:
    57   static void hoistStruct( std::list< Declaration* > &translationUnit );
    58  
    59   std::list< Declaration* > &get_declsToAdd() { return declsToAdd; }
    60  
    61   virtual void visit(StructDecl *aggregateDecl);
    62   virtual void visit(UnionDecl *aggregateDecl);
    63 
    64   virtual void visit(CompoundStmt *compoundStmt);
    65   virtual void visit(IfStmt *ifStmt);
    66   virtual void visit(WhileStmt *whileStmt);
    67   virtual void visit(ForStmt *forStmt);
    68   virtual void visit(SwitchStmt *switchStmt);
    69   virtual void visit(ChooseStmt *chooseStmt);
    70   virtual void visit(CaseStmt *caseStmt);
    71   virtual void visit(CatchStmt *catchStmt);
    72  
    73 private:
    74   HoistStruct();
    75 
    76   template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl );
    77 
    78   std::list< Declaration* > declsToAdd;
    79   bool inStruct;
    80 };
    81 
    82 class Pass1 : public Visitor
    83 {
    84   typedef Visitor Parent;
    85   virtual void visit( EnumDecl *aggregateDecl);
    86   virtual void visit( FunctionType *func );
    87 };
    88  
    89 class Pass2 : public Indexer
    90 {
    91   typedef Indexer Parent;
    92 
    93 public:
    94   Pass2( bool doDebug, const Indexer *indexer );
    95 
    96 private:
    97   virtual void visit( StructInstType *structInst );
    98   virtual void visit( UnionInstType *unionInst );
    99   virtual void visit( ContextInstType *contextInst );
    100   virtual void visit( StructDecl *structDecl );
    101   virtual void visit( UnionDecl *unionDecl );
    102   virtual void visit( TypeInstType *typeInst );
    103 
    104   const Indexer *indexer;
    105  
    106   typedef std::map< std::string, std::list< StructInstType* > > ForwardStructsType;
    107   typedef std::map< std::string, std::list< UnionInstType* > > ForwardUnionsType;
    108   ForwardStructsType forwardStructs;
    109   ForwardUnionsType forwardUnions;
    110 };
    111 
    112 class Pass3 : public Indexer
    113 {
    114   typedef Indexer Parent;
    115 
    116 public:
    117   Pass3( const Indexer *indexer );
    118 
    119 private:
    120   virtual void visit( ObjectDecl *object );
    121   virtual void visit( FunctionDecl *func );
    122 
    123   const Indexer *indexer;
    124 };
    125 
    126 class AddStructAssignment : public Visitor
    127 {
    128 public:
    129   static void addStructAssignment( std::list< Declaration* > &translationUnit );
    130 
    131   std::list< Declaration* > &get_declsToAdd() { return declsToAdd; }
    132  
    133   virtual void visit( StructDecl *structDecl );
    134   virtual void visit( UnionDecl *structDecl );
    135   virtual void visit( TypeDecl *typeDecl );
    136   virtual void visit( ContextDecl *ctxDecl );
    137 
    138   virtual void visit( FunctionType *ftype );
    139   virtual void visit( PointerType *ftype );
    140  
    141   virtual void visit(CompoundStmt *compoundStmt);
    142   virtual void visit(IfStmt *ifStmt);
    143   virtual void visit(WhileStmt *whileStmt);
    144   virtual void visit(ForStmt *forStmt);
    145   virtual void visit(SwitchStmt *switchStmt);
    146   virtual void visit(ChooseStmt *chooseStmt);
    147   virtual void visit(CaseStmt *caseStmt);
    148   virtual void visit(CatchStmt *catchStmt);
    149  
    150 private:
    151   template< typename StmtClass > void visitStatement(StmtClass *stmt);
    152  
    153   std::list< Declaration* > declsToAdd;
    154   std::set< std::string > structsDone;
    155 };
    156 
    157 class EliminateTypedef : public Mutator
    158 {
    159 public:
    160   static void eliminateTypedef( std::list< Declaration* > &translationUnit );
    161  
    162 private:
    163   virtual Declaration* mutate(TypedefDecl *typeDecl);
    164   virtual TypeDecl* mutate(TypeDecl *typeDecl);
    165   virtual DeclarationWithType* mutate(FunctionDecl *funcDecl);
    166   virtual ObjectDecl* mutate(ObjectDecl *objDecl);
    167   virtual CompoundStmt* mutate(CompoundStmt *compoundStmt);
    168   virtual Type* mutate(TypeInstType *aggregateUseType);
    169   virtual Expression* mutate(CastExpr *castExpr);
    170  
    171   std::map< std::string, TypedefDecl* > typedefNames;
    172 };
    173 
    174 void
    175 validate( std::list< Declaration* > &translationUnit, bool doDebug, const Indexer *indexer )
    176 {
    177   Pass1 pass1;
    178   Pass2 pass2( doDebug, indexer );
    179   Pass3 pass3( indexer );
    180   EliminateTypedef::eliminateTypedef( translationUnit );
    181   HoistStruct::hoistStruct( translationUnit );
    182   acceptAll( translationUnit, pass1 );
    183   acceptAll( translationUnit, pass2 );
    184   AddStructAssignment::addStructAssignment( translationUnit );
    185   acceptAll( translationUnit, pass3 );
    186 }
    187 
    188 void
    189 validateType( Type *type, const Indexer *indexer )
    190 {
    191   Pass1 pass1;
    192   Pass2 pass2( false, indexer );
    193   Pass3 pass3( indexer );
    194   type->accept( pass1 );
    195   type->accept( pass2 );
    196   type->accept( pass3 );
    197 }
    198 
    199 template< typename Visitor >
    200 void
    201 acceptAndAdd( std::list< Declaration* > &translationUnit, Visitor &visitor, bool addBefore )
    202 {
    203   std::list< Declaration* >::iterator i = translationUnit.begin();
    204   while( i != translationUnit.end() ) {
    205     (*i)->accept( visitor );
    206     std::list< Declaration* >::iterator next = i;
    207     next++;
    208     if( !visitor.get_declsToAdd().empty() ) {
    209       translationUnit.splice( addBefore ? i : next, visitor.get_declsToAdd() );
    210     }
    211     i = next;
    212   }
    213 }
    214 
    215 /* static class method */
    216 void
    217 HoistStruct::hoistStruct( std::list< Declaration* > &translationUnit )
    218 {
    219   HoistStruct hoister;
    220   acceptAndAdd( translationUnit, hoister, true );
    221 }
    222 
    223 HoistStruct::HoistStruct()
    224   : inStruct( false )
    225 {
    226 }
    227 
    228 void
    229 filter( std::list< Declaration* > &declList, bool (*pred)( Declaration* ), bool doDelete )
    230 {
    231   std::list< Declaration* >::iterator i = declList.begin();
    232   while( i != declList.end() ) {
    233     std::list< Declaration* >::iterator next = i;
    234     ++next;
    235     if( pred( *i ) ) {
    236       if( doDelete ) {
    237         delete *i;
    238       }
    239       declList.erase( i );
    240     }
    241     i = next;
    242   }
    243 }
    244 
    245 bool
    246 isStructOrUnion( Declaration *decl )
    247 {
    248   return dynamic_cast< StructDecl* >( decl ) || dynamic_cast< UnionDecl* >( decl );
    249 }
    250 
    251 template< typename AggDecl >
    252 void
    253 HoistStruct::handleAggregate( AggDecl *aggregateDecl )
    254 {
    255   if( inStruct ) {
    256     declsToAdd.push_back( aggregateDecl );
    257     Visitor::visit( aggregateDecl );
    258   } else {
    259     inStruct = true;
    260     Visitor::visit( aggregateDecl );
    261     inStruct = false;
    262     filter( aggregateDecl->get_members(), isStructOrUnion, false );
    263   }
    264 }
    265 
    266 void
    267 HoistStruct::visit(StructDecl *aggregateDecl)
    268 {
    269   handleAggregate( aggregateDecl );
    270 }
    271 
    272 void
    273 HoistStruct::visit(UnionDecl *aggregateDecl)
    274 {
    275   handleAggregate( aggregateDecl );
    276 }
    277 
    278 void
    279 HoistStruct::visit(CompoundStmt *compoundStmt)
    280 {
    281   addVisit( compoundStmt, *this );
    282 }
    283 
    284 void
    285 HoistStruct::visit(IfStmt *ifStmt)
    286 {
    287   addVisit( ifStmt, *this );
    288 }
    289 
    290 void
    291 HoistStruct::visit(WhileStmt *whileStmt)
    292 {
    293   addVisit( whileStmt, *this );
    294 }
    295 
    296 void
    297 HoistStruct::visit(ForStmt *forStmt)
    298 {
    299   addVisit( forStmt, *this );
    300 }
    301 
    302 void
    303 HoistStruct::visit(SwitchStmt *switchStmt)
    304 {
    305   addVisit( switchStmt, *this );
    306 }
    307 
    308 void
    309 HoistStruct::visit(ChooseStmt *switchStmt)
    310 {
    311   addVisit( switchStmt, *this );
    312 }
    313 
    314 void
    315 HoistStruct::visit(CaseStmt *caseStmt)
    316 {
    317   addVisit( caseStmt, *this );
    318 }
    319 
    320 void
    321 HoistStruct::visit(CatchStmt *cathStmt)
    322 {
    323   addVisit( cathStmt, *this );
    324 }
    325 
    326 void
    327 Pass1::visit( EnumDecl *enumDecl)
    328 {
    329   // Set the type of each member of the enumeration to be EnumConstant
    330  
    331   for( std::list< Declaration* >::iterator i = enumDecl->get_members().begin(); i != enumDecl->get_members().end(); ++i ) {
    332     ObjectDecl *obj = dynamic_cast< ObjectDecl* >( *i );
    333     assert( obj );
    334     obj->set_type( new EnumInstType( Type::Qualifiers( true, false, false, false ), enumDecl->get_name() ) );
    335   }
    336   Parent::visit( enumDecl );
    337 }
    338 
    339 namespace {
    340 template< typename DWTIterator >
    341 void
    342 fixFunctionList( DWTIterator begin, DWTIterator end, FunctionType *func )
    343 {
    344   // the only case in which "void" is valid is where it is the only one in the list; then
    345   // it should be removed entirely
    346   // other fix ups are handled by the FixFunction class
    347   if( begin == end ) return;
    348   FixFunction fixer;
    349   DWTIterator i = begin;
    350   *i = (*i)->acceptMutator( fixer );
    351   if( fixer.get_isVoid() ) {
    352     DWTIterator j = i;
    353     ++i;
    354     func->get_parameters().erase( j );
    355     if( i != end ) {
    356       throw SemanticError( "invalid type void in function type ", func );
    357     }
    358   } else {
    359     ++i;
    360     for( ; i != end; ++i ) {
    361       FixFunction fixer;
    362       *i = (*i)->acceptMutator( fixer );
    363       if( fixer.get_isVoid() ) {
    364         throw SemanticError( "invalid type void in function type ", func );
    365       }
    366     }
    367   }
    368 }
    369 }
    370 
    371 void
    372 Pass1::visit( FunctionType *func )
    373 {
    374   // Fix up parameters and return types
    375   fixFunctionList( func->get_parameters().begin(), func->get_parameters().end(), func );
    376   fixFunctionList( func->get_returnVals().begin(), func->get_returnVals().end(), func );
    377   Visitor::visit( func );
    378 }
    379 
    380 Pass2::Pass2( bool doDebug, const Indexer *other_indexer )
    381   : Indexer( doDebug )
    382 {
    383   if( other_indexer ) {
    384     indexer = other_indexer;
    385   } else {
    386     indexer = this;
    387   }
    388 }
    389 
    390 void
    391 Pass2::visit( StructInstType *structInst )
    392 {
    393   Parent::visit( structInst );
    394   StructDecl *st = indexer->lookupStruct( structInst->get_name() );
    395   // it's not a semantic error if the struct is not found, just an implicit forward declaration
    396   if( st ) {
    397     assert( !structInst->get_baseStruct() || structInst->get_baseStruct()->get_members().empty() || !st->get_members().empty() );
    398     structInst->set_baseStruct( st );
    399   }
    400   if( !st || st->get_members().empty() ) {
    401     // use of forward declaration
    402     forwardStructs[ structInst->get_name() ].push_back( structInst );
    403   }
    404 }
    405 
    406 void
    407 Pass2::visit( UnionInstType *unionInst )
    408 {
    409   Parent::visit( unionInst );
    410   UnionDecl *un = indexer->lookupUnion( unionInst->get_name() );
    411   // it's not a semantic error if the union is not found, just an implicit forward declaration
    412   if( un ) {
    413     unionInst->set_baseUnion( un );
    414   }
    415   if( !un || un->get_members().empty() ) {
    416     // use of forward declaration
    417     forwardUnions[ unionInst->get_name() ].push_back( unionInst );
    418   }
    419 }
    420 
    421 void
    422 Pass2::visit( ContextInstType *contextInst )
    423 {
    424   Parent::visit( contextInst );
    425   ContextDecl *ctx = indexer->lookupContext( contextInst->get_name() );
    426   if( !ctx ) {
    427     throw SemanticError( "use of undeclared context " + contextInst->get_name() );
    428   }
    429   for( std::list< TypeDecl* >::const_iterator i = ctx->get_parameters().begin(); i != ctx->get_parameters().end(); ++i ) {
    430     for( std::list< DeclarationWithType* >::const_iterator assert = (*i)->get_assertions().begin(); assert != (*i)->get_assertions().end(); ++assert ) {
    431       if( ContextInstType *otherCtx = dynamic_cast< ContextInstType* >(*assert) ) {
    432         cloneAll( otherCtx->get_members(), contextInst->get_members() );
    433       } else {
    434         contextInst->get_members().push_back( (*assert)->clone() );
    435       }
    436     }
    437   }
    438   applySubstitution( ctx->get_parameters().begin(), ctx->get_parameters().end(), contextInst->get_parameters().begin(), ctx->get_members().begin(), ctx->get_members().end(), back_inserter( contextInst->get_members() ) );
    439 }
    440 
    441 void
    442 Pass2::visit( StructDecl *structDecl )
    443 {
    444   if( !structDecl->get_members().empty() ) {
    445     ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->get_name() );
    446     if( fwds != forwardStructs.end() ) {
    447       for( std::list< StructInstType* >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
    448         (*inst)->set_baseStruct( structDecl );
    449       }
    450       forwardStructs.erase( fwds );
    451     }
    452   }
    453   Indexer::visit( structDecl );
    454 }
    455 
    456 void
    457 Pass2::visit( UnionDecl *unionDecl )
    458 {
    459   if( !unionDecl->get_members().empty() ) {
    460     ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->get_name() );
    461     if( fwds != forwardUnions.end() ) {
    462       for( std::list< UnionInstType* >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
    463         (*inst)->set_baseUnion( unionDecl );
    464       }
    465       forwardUnions.erase( fwds );
    466     }
    467   }
    468   Indexer::visit( unionDecl );
    469 }
    470 
    471 void
    472 Pass2::visit( TypeInstType *typeInst )
    473 {
    474   if( NamedTypeDecl *namedTypeDecl = lookupType( typeInst->get_name() ) ) {
    475     if( TypeDecl *typeDecl = dynamic_cast< TypeDecl* >( namedTypeDecl ) ) {
    476       typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype );
    477     }
    478   }
    479 }
    480 
    481 Pass3::Pass3( const Indexer *other_indexer )
    482   : Indexer( false )
    483 {
    484   if( other_indexer ) {
    485     indexer = other_indexer;
    486   } else {
    487     indexer = this;
    488   }
    489 }
    490 
    491 void
    492 forallFixer( Type *func )
    493 {
    494   // Fix up assertions
    495   for( std::list< TypeDecl* >::iterator type = func->get_forall().begin(); type != func->get_forall().end(); ++type ) {
    496     std::list< DeclarationWithType* > toBeDone, nextRound;
    497     toBeDone.splice( toBeDone.end(), (*type)->get_assertions() );
    498     while( !toBeDone.empty() ) {
    499       for( std::list< DeclarationWithType* >::iterator assertion = toBeDone.begin(); assertion != toBeDone.end(); ++assertion ) {
    500         if( ContextInstType *ctx = dynamic_cast< ContextInstType* >( (*assertion)->get_type() ) ) {
    501           for( std::list< Declaration* >::const_iterator i = ctx->get_members().begin(); i != ctx->get_members().end(); ++i ) {
    502             DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *i );
    503             assert( dwt );
    504             nextRound.push_back( dwt->clone() );
    505           }
    506           delete ctx;
    507         } else {
    508           FixFunction fixer;
    509           *assertion = (*assertion)->acceptMutator( fixer );
    510           if( fixer.get_isVoid() ) {
    511             throw SemanticError( "invalid type void in assertion of function ", func );
    512           }
    513           (*type)->get_assertions().push_back( *assertion );
    514         }
    515       }
    516       toBeDone.clear();
    517       toBeDone.splice( toBeDone.end(), nextRound );
    518     }
    519   }
    520 }
    521 
    522 void
    523 Pass3::visit( ObjectDecl *object )
    524 {
    525   forallFixer( object->get_type() );
    526   if( PointerType *pointer = dynamic_cast< PointerType* >( object->get_type() ) ) {
    527     forallFixer( pointer->get_base() );
    528   }
    529   Parent::visit( object );
    530   object->fixUniqueId();
    531 }
    532 
    533 void
    534 Pass3::visit( FunctionDecl *func )
    535 {
    536   forallFixer( func->get_type() );
    537   Parent::visit( func );
    538   func->fixUniqueId();
    539 }
    540 
    541 static const std::list< std::string > noLabels;
    542 
    543 /* static class method */
    544 void
    545 AddStructAssignment::addStructAssignment( std::list< Declaration* > &translationUnit )
    546 {
    547   AddStructAssignment visitor;
    548   acceptAndAdd( translationUnit, visitor, false );
    549 }
    550 
    551 template< typename OutputIterator >
    552 void
    553 makeScalarAssignment( ObjectDecl *srcParam, ObjectDecl *dstParam, DeclarationWithType *member, OutputIterator out )
    554 {
    555   ObjectDecl *obj = dynamic_cast<ObjectDecl *>( member ); // PAB: unnamed bit fields are not copied
    556   if ( obj != NULL && obj->get_name() == "" && obj->get_bitfieldWidth() != NULL ) return;
    557 
    558   UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
    559  
    560   UntypedExpr *derefExpr = new UntypedExpr( new NameExpr( "*?" ) );
    561   derefExpr->get_args().push_back( new VariableExpr( dstParam ) );
    562  
    563   // do something special for unnamed members
    564   Expression *dstselect = new AddressExpr( new MemberExpr( member, derefExpr ) );
    565   assignExpr->get_args().push_back( dstselect );
    566  
    567   Expression *srcselect = new MemberExpr( member, new VariableExpr( srcParam ) );
    568   assignExpr->get_args().push_back( srcselect );
    569  
    570   *out++ = new ExprStmt( noLabels, assignExpr );
    571 }
    572 
    573 template< typename OutputIterator >
    574 void
    575 makeArrayAssignment( ObjectDecl *srcParam, ObjectDecl *dstParam, DeclarationWithType *member, ArrayType *array, OutputIterator out )
    576 {
    577   static UniqueName indexName( "_index" );
    578  
    579   // for a flexible array member nothing is done -- user must define own assignment
    580   if( !array->get_dimension() ) return;
    581  
    582   ObjectDecl *index = new ObjectDecl( indexName.newName(), Declaration::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), 0 );
    583   *out++ = new DeclStmt( noLabels, index );
    584  
    585   UntypedExpr *init = new UntypedExpr( new NameExpr( "?=?" ) );
    586   init->get_args().push_back( new AddressExpr( new VariableExpr( index ) ) );
    587   init->get_args().push_back( new NameExpr( "0" ) );
    588   Statement *initStmt = new ExprStmt( noLabels, init );
    589  
    590   UntypedExpr *cond = new UntypedExpr( new NameExpr( "?<?" ) );
    591   cond->get_args().push_back( new VariableExpr( index ) );
    592   cond->get_args().push_back( array->get_dimension()->clone() );
    593  
    594   UntypedExpr *inc = new UntypedExpr( new NameExpr( "++?" ) );
    595   inc->get_args().push_back( new AddressExpr( new VariableExpr( index ) ) );
    596  
    597   UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
    598  
    599   UntypedExpr *derefExpr = new UntypedExpr( new NameExpr( "*?" ) );
    600   derefExpr->get_args().push_back( new VariableExpr( dstParam ) );
    601  
    602   Expression *dstselect = new MemberExpr( member, derefExpr );
    603   UntypedExpr *dstIndex = new UntypedExpr( new NameExpr( "?+?" ) );
    604   dstIndex->get_args().push_back( dstselect );
    605   dstIndex->get_args().push_back( new VariableExpr( index ) );
    606   assignExpr->get_args().push_back( dstIndex );
    607  
    608   Expression *srcselect = new MemberExpr( member, new VariableExpr( srcParam ) );
    609   UntypedExpr *srcIndex = new UntypedExpr( new NameExpr( "?[?]" ) );
    610   srcIndex->get_args().push_back( srcselect );
    611   srcIndex->get_args().push_back( new VariableExpr( index ) );
    612   assignExpr->get_args().push_back( srcIndex );
    613  
    614   *out++ = new ForStmt( noLabels, initStmt, cond, inc, new ExprStmt( noLabels, assignExpr ) );
    615 }
    616 
    617 Declaration*
    618 makeStructAssignment( StructDecl *aggregateDecl, StructInstType *refType )
    619 {
    620   FunctionType *assignType = new FunctionType( Type::Qualifiers(), false );
    621  
    622   ObjectDecl *returnVal = new ObjectDecl( "", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType->clone(), 0 );
    623   assignType->get_returnVals().push_back( returnVal );
    624  
    625   ObjectDecl *dstParam = new ObjectDecl( "_dst", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), refType->clone() ), 0 );
    626   assignType->get_parameters().push_back( dstParam );
    627  
    628   ObjectDecl *srcParam = new ObjectDecl( "_src", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType, 0 );
    629   assignType->get_parameters().push_back( srcParam );
    630  
    631   FunctionDecl *assignDecl = new FunctionDecl( "?=?", Declaration::Static, LinkageSpec::AutoGen, assignType, new CompoundStmt( noLabels ), true );
    632   assignDecl->fixUniqueId();
    633  
    634   for( std::list< Declaration* >::const_iterator member = aggregateDecl->get_members().begin(); member != aggregateDecl->get_members().end(); ++member ) {
    635     if( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType* >( *member ) ) {
    636       if( ArrayType *array = dynamic_cast< ArrayType* >( dwt->get_type() ) ) {
    637         makeArrayAssignment( srcParam, dstParam, dwt, array, back_inserter( assignDecl->get_statements()->get_kids() ) );
    638       } else {
    639         makeScalarAssignment( srcParam, dstParam, dwt, back_inserter( assignDecl->get_statements()->get_kids() ) );
    640       }
    641     }
    642   }
    643   assignDecl->get_statements()->get_kids().push_back( new ReturnStmt( noLabels, new VariableExpr( srcParam ) ) );
    644  
    645   return assignDecl;
    646 }
    647 
    648 Declaration*
    649 makeUnionAssignment( UnionDecl *aggregateDecl, UnionInstType *refType )
    650 {
    651   FunctionType *assignType = new FunctionType( Type::Qualifiers(), false );
    652  
    653   ObjectDecl *returnVal = new ObjectDecl( "", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType->clone(), 0 );
    654   assignType->get_returnVals().push_back( returnVal );
    655  
    656   ObjectDecl *dstParam = new ObjectDecl( "_dst", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), refType->clone() ), 0 );
    657   assignType->get_parameters().push_back( dstParam );
    658  
    659   ObjectDecl *srcParam = new ObjectDecl( "_src", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType, 0 );
    660   assignType->get_parameters().push_back( srcParam );
    661  
    662   FunctionDecl *assignDecl = new FunctionDecl( "?=?", Declaration::Static, LinkageSpec::AutoGen, assignType, new CompoundStmt( noLabels ), true );
    663   assignDecl->fixUniqueId();
    664  
    665   UntypedExpr *copy = new UntypedExpr( new NameExpr( "__builtin_memcpy" ) );
    666   copy->get_args().push_back( new VariableExpr( dstParam ) );
    667   copy->get_args().push_back( new AddressExpr( new VariableExpr( srcParam ) ) );
    668   copy->get_args().push_back( new SizeofExpr( refType->clone() ) );
    669 
    670   assignDecl->get_statements()->get_kids().push_back( new ExprStmt( noLabels, copy ) );
    671   assignDecl->get_statements()->get_kids().push_back( new ReturnStmt( noLabels, new VariableExpr( srcParam ) ) );
    672  
    673   return assignDecl;
    674 }
    675 
    676 void
    677 AddStructAssignment::visit( StructDecl *structDecl )
    678 {
    679   if( !structDecl->get_members().empty() && structsDone.find( structDecl->get_name() ) == structsDone.end() ) {
    680     StructInstType *structInst = new StructInstType( Type::Qualifiers(), structDecl->get_name() );
    681     structInst->set_baseStruct( structDecl );
    682     declsToAdd.push_back( makeStructAssignment( structDecl, structInst ) );
    683     structsDone.insert( structDecl->get_name() );
    684   }
    685 }
    686 
    687 void
    688 AddStructAssignment::visit( UnionDecl *unionDecl )
    689 {
    690   if( !unionDecl->get_members().empty() ) {
    691     UnionInstType *unionInst = new UnionInstType( Type::Qualifiers(), unionDecl->get_name() );
    692     unionInst->set_baseUnion( unionDecl );
    693     declsToAdd.push_back( makeUnionAssignment( unionDecl, unionInst ) );
    694   }
    695 }
    696 
    697 void
    698 AddStructAssignment::visit( TypeDecl *typeDecl )
    699 {
    700   CompoundStmt *stmts = 0;
    701   TypeInstType *typeInst = new TypeInstType( Type::Qualifiers(), typeDecl->get_name(), false );
    702   typeInst->set_baseType( typeDecl );
    703   ObjectDecl *src = new ObjectDecl( "_src", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, typeInst->clone(), 0 );
    704   ObjectDecl *dst = new ObjectDecl( "_dst", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), typeInst->clone() ), 0 );
    705   if( typeDecl->get_base() ) {
    706     stmts = new CompoundStmt( std::list< Label >() );
    707     UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
    708     assign->get_args().push_back( new CastExpr( new VariableExpr( dst ), new PointerType( Type::Qualifiers(), typeDecl->get_base()->clone() ) ) );
    709     assign->get_args().push_back( new CastExpr( new VariableExpr( src ), typeDecl->get_base()->clone() ) );
    710     stmts->get_kids().push_back( new ReturnStmt( std::list< Label >(), assign ) );
    711   }
    712   FunctionType *type = new FunctionType( Type::Qualifiers(), false );
    713   type->get_returnVals().push_back( new ObjectDecl( "", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, typeInst, 0 ) );
    714   type->get_parameters().push_back( dst );
    715   type->get_parameters().push_back( src );
    716   FunctionDecl *func = new FunctionDecl( "?=?", Declaration::NoStorageClass, LinkageSpec::AutoGen, type, stmts, false );
    717   declsToAdd.push_back( func );
    718 }
    719 
    720 void
    721 addDecls( std::list< Declaration* > &declsToAdd, std::list< Statement* > &statements, std::list< Statement* >::iterator i )
    722 {
    723   if( !declsToAdd.empty() ) {
    724     for( std::list< Declaration* >::iterator decl = declsToAdd.begin(); decl != declsToAdd.end(); ++decl ) {
    725       statements.insert( i, new DeclStmt( noLabels, *decl ) );
    726     }
    727     declsToAdd.clear();
    728   }
    729 }
    730 
    731 void
    732 AddStructAssignment::visit(FunctionType *)
    733 {
    734   // ensure that we don't add assignment ops for types defined
    735   // as part of the function
    736 }
    737 
    738 void
    739 AddStructAssignment::visit(PointerType *)
    740 {
    741   // ensure that we don't add assignment ops for types defined
    742   // as part of the pointer
    743 }
    744 
    745 void
    746 AddStructAssignment::visit(ContextDecl *)
    747 {
    748   // ensure that we don't add assignment ops for types defined
    749   // as part of the context
    750 }
    751 
    752 template< typename StmtClass >
    753 inline void
    754 AddStructAssignment::visitStatement(StmtClass *stmt)
    755 {
    756   std::set< std::string > oldStructs = structsDone;
    757   addVisit( stmt, *this );
    758   structsDone = oldStructs;
    759 }
    760 
    761 void
    762 AddStructAssignment::visit(CompoundStmt *compoundStmt)
    763 {
    764   visitStatement( compoundStmt );
    765 }
    766 
    767 void
    768 AddStructAssignment::visit(IfStmt *ifStmt)
    769 {
    770   visitStatement( ifStmt );
    771 }
    772 
    773 void
    774 AddStructAssignment::visit(WhileStmt *whileStmt)
    775 {
    776   visitStatement( whileStmt );
    777 }
    778 
    779 void
    780 AddStructAssignment::visit(ForStmt *forStmt)
    781 {
    782   visitStatement( forStmt );
    783 }
    784 
    785 void
    786 AddStructAssignment::visit(SwitchStmt *switchStmt)
    787 {
    788   visitStatement( switchStmt );
    789 }
    790 
    791 void
    792 AddStructAssignment::visit(ChooseStmt *switchStmt)
    793 {
    794   visitStatement( switchStmt );
    795 }
    796 
    797 void
    798 AddStructAssignment::visit(CaseStmt *caseStmt)
    799 {
    800   visitStatement( caseStmt );
    801 }
    802 
    803 void
    804 AddStructAssignment::visit(CatchStmt *cathStmt)
    805 {
    806   visitStatement( cathStmt );
    807 }
    808 
    809 bool
    810 isTypedef( Declaration *decl )
    811 {
    812   return dynamic_cast< TypedefDecl* >( decl );
    813 }
    814 
    815 
    816 /* static class method */
    817 void
    818 EliminateTypedef::eliminateTypedef( std::list< Declaration* > &translationUnit )
    819 {
    820   EliminateTypedef eliminator;
    821   mutateAll( translationUnit, eliminator );
    822   filter( translationUnit, isTypedef, true );
    823 }
    824 
    825 Type*
    826 EliminateTypedef::mutate( TypeInstType *typeInst )
    827 {
    828   std::map< std::string, TypedefDecl* >::const_iterator def = typedefNames.find( typeInst->get_name() );
    829   if( def != typedefNames.end() ) {
    830     Type *ret = def->second->get_base()->clone();
    831     ret->get_qualifiers() += typeInst->get_qualifiers();
    832     delete typeInst;
    833     return ret;
    834   }
    835   return typeInst;
    836 }
    837 
    838 Declaration*
    839 EliminateTypedef::mutate( TypedefDecl *tyDecl )
    840 {
    841   Declaration *ret = Mutator::mutate( tyDecl );
    842   typedefNames[ tyDecl->get_name() ] = tyDecl;
    843   if( AggregateDecl *aggDecl = dynamic_cast< AggregateDecl* >( tyDecl->get_base() ) ) {
    844     tyDecl->set_base( 0 );
    845     delete tyDecl;
    846     return aggDecl;
    847   } else {
    848     return ret;
    849   }
    850 }
    851 
    852 TypeDecl*
    853 EliminateTypedef::mutate(TypeDecl *typeDecl)
    854 {
    855   std::map< std::string, TypedefDecl* >::iterator i = typedefNames.find( typeDecl->get_name() );
    856   if( i != typedefNames.end() ) {
    857     typedefNames.erase( i ) ;
    858   }
    859   return typeDecl;
    860 }
    861 
    862 DeclarationWithType*
    863 EliminateTypedef::mutate(FunctionDecl *funcDecl)
    864 {
    865   std::map< std::string, TypedefDecl* > oldNames = typedefNames;
    866   DeclarationWithType *ret = Mutator::mutate( funcDecl );
    867   typedefNames = oldNames;
    868   return ret;
    869 }
    870 
    871 ObjectDecl*
    872 EliminateTypedef::mutate(ObjectDecl *objDecl)
    873 {
    874   std::map< std::string, TypedefDecl* > oldNames = typedefNames;
    875   ObjectDecl *ret = Mutator::mutate( objDecl );
    876   typedefNames = oldNames;
    877   return ret;
    878 }
    879 
    880 Expression*
    881 EliminateTypedef::mutate(CastExpr *castExpr)
    882 {
    883   std::map< std::string, TypedefDecl* > oldNames = typedefNames;
    884   Expression *ret = Mutator::mutate( castExpr );
    885   typedefNames = oldNames;
    886   return ret;
    887 }
    888 
    889 CompoundStmt *
    890 EliminateTypedef::mutate( CompoundStmt *compoundStmt )
    891 {
    892   std::map< std::string, TypedefDecl* > oldNames = typedefNames;
    893   CompoundStmt *ret = Mutator::mutate( compoundStmt );
    894   std::list< Statement* >::iterator i = compoundStmt->get_kids().begin();
    895   while( i != compoundStmt->get_kids().end() ) {
    896     std::list< Statement* >::iterator next = i;
    897     ++next;
    898     if( DeclStmt *declStmt = dynamic_cast< DeclStmt* >( *i ) ) {
    899       if( dynamic_cast< TypedefDecl* >( declStmt->get_decl() ) ) {
    900         delete *i;
    901         compoundStmt->get_kids().erase( i );
    902       }
    903     }
    904     i = next;
    905   }
    906   typedefNames = oldNames;
    907   return ret;
    908 }
    909 
     46    class HoistStruct : public Visitor {
     47      public:
     48        static void hoistStruct( std::list< Declaration * > &translationUnit );
     49 
     50        std::list< Declaration * > &get_declsToAdd() { return declsToAdd; }
     51 
     52        virtual void visit( StructDecl *aggregateDecl );
     53        virtual void visit( UnionDecl *aggregateDecl );
     54
     55        virtual void visit( CompoundStmt *compoundStmt );
     56        virtual void visit( IfStmt *ifStmt );
     57        virtual void visit( WhileStmt *whileStmt );
     58        virtual void visit( ForStmt *forStmt );
     59        virtual void visit( SwitchStmt *switchStmt );
     60        virtual void visit( ChooseStmt *chooseStmt );
     61        virtual void visit( CaseStmt *caseStmt );
     62        virtual void visit( CatchStmt *catchStmt );
     63      private:
     64        HoistStruct();
     65
     66        template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl );
     67
     68        std::list< Declaration * > declsToAdd;
     69        bool inStruct;
     70    };
     71
     72    class Pass1 : public Visitor {
     73        typedef Visitor Parent;
     74        virtual void visit( EnumDecl *aggregateDecl );
     75        virtual void visit( FunctionType *func );
     76    };
     77 
     78    class Pass2 : public Indexer {
     79        typedef Indexer Parent;
     80      public:
     81        Pass2( bool doDebug, const Indexer *indexer );
     82      private:
     83        virtual void visit( StructInstType *structInst );
     84        virtual void visit( UnionInstType *unionInst );
     85        virtual void visit( ContextInstType *contextInst );
     86        virtual void visit( StructDecl *structDecl );
     87        virtual void visit( UnionDecl *unionDecl );
     88        virtual void visit( TypeInstType *typeInst );
     89
     90        const Indexer *indexer;
     91 
     92        typedef std::map< std::string, std::list< StructInstType * > > ForwardStructsType;
     93        typedef std::map< std::string, std::list< UnionInstType * > > ForwardUnionsType;
     94        ForwardStructsType forwardStructs;
     95        ForwardUnionsType forwardUnions;
     96    };
     97
     98    class Pass3 : public Indexer {
     99        typedef Indexer Parent;
     100      public:
     101        Pass3( const Indexer *indexer );
     102      private:
     103        virtual void visit( ObjectDecl *object );
     104        virtual void visit( FunctionDecl *func );
     105
     106        const Indexer *indexer;
     107    };
     108
     109    class AddStructAssignment : public Visitor {
     110      public:
     111        static void addStructAssignment( std::list< Declaration * > &translationUnit );
     112
     113        std::list< Declaration * > &get_declsToAdd() { return declsToAdd; }
     114 
     115        virtual void visit( StructDecl *structDecl );
     116        virtual void visit( UnionDecl *structDecl );
     117        virtual void visit( TypeDecl *typeDecl );
     118        virtual void visit( ContextDecl *ctxDecl );
     119
     120        virtual void visit( FunctionType *ftype );
     121        virtual void visit( PointerType *ftype );
     122 
     123        virtual void visit( CompoundStmt *compoundStmt );
     124        virtual void visit( IfStmt *ifStmt );
     125        virtual void visit( WhileStmt *whileStmt );
     126        virtual void visit( ForStmt *forStmt );
     127        virtual void visit( SwitchStmt *switchStmt );
     128        virtual void visit( ChooseStmt *chooseStmt );
     129        virtual void visit( CaseStmt *caseStmt );
     130        virtual void visit( CatchStmt *catchStmt );
     131      private:
     132        template< typename StmtClass > void visitStatement( StmtClass *stmt );
     133 
     134        std::list< Declaration * > declsToAdd;
     135        std::set< std::string > structsDone;
     136    };
     137
     138    class EliminateTypedef : public Mutator {
     139      public:
     140        static void eliminateTypedef( std::list< Declaration * > &translationUnit );
     141      private:
     142        virtual Declaration *mutate( TypedefDecl *typeDecl );
     143        virtual TypeDecl *mutate( TypeDecl *typeDecl );
     144        virtual DeclarationWithType *mutate( FunctionDecl *funcDecl );
     145        virtual ObjectDecl *mutate( ObjectDecl *objDecl );
     146        virtual CompoundStmt *mutate( CompoundStmt *compoundStmt );
     147        virtual Type *mutate( TypeInstType *aggregateUseType );
     148        virtual Expression *mutate( CastExpr *castExpr );
     149 
     150        std::map< std::string, TypedefDecl * > typedefNames;
     151    };
     152
     153    void validate( std::list< Declaration * > &translationUnit, bool doDebug, const Indexer *indexer ) {
     154        Pass1 pass1;
     155        Pass2 pass2( doDebug, indexer );
     156        Pass3 pass3( indexer );
     157        EliminateTypedef::eliminateTypedef( translationUnit );
     158        HoistStruct::hoistStruct( translationUnit );
     159        acceptAll( translationUnit, pass1 );
     160        acceptAll( translationUnit, pass2 );
     161        AddStructAssignment::addStructAssignment( translationUnit );
     162        acceptAll( translationUnit, pass3 );
     163    }
     164
     165    void validateType( Type *type, const Indexer *indexer ) {
     166        Pass1 pass1;
     167        Pass2 pass2( false, indexer );
     168        Pass3 pass3( indexer );
     169        type->accept( pass1 );
     170        type->accept( pass2 );
     171        type->accept( pass3 );
     172    }
     173
     174    template< typename Visitor >
     175    void acceptAndAdd( std::list< Declaration * > &translationUnit, Visitor &visitor, bool addBefore ) {
     176        std::list< Declaration * >::iterator i = translationUnit.begin();
     177        while ( i != translationUnit.end() ) {
     178            (*i )->accept( visitor );
     179            std::list< Declaration * >::iterator next = i;
     180            next++;
     181            if ( ! visitor.get_declsToAdd().empty() ) {
     182                translationUnit.splice( addBefore ? i : next, visitor.get_declsToAdd() );
     183            }
     184            i = next;
     185        }
     186    }
     187
     188    void HoistStruct::hoistStruct( std::list< Declaration * > &translationUnit ) {
     189        HoistStruct hoister;
     190        acceptAndAdd( translationUnit, hoister, true );
     191    }
     192
     193    HoistStruct::HoistStruct()
     194        : inStruct( false ) {
     195    }
     196
     197    void filter( std::list< Declaration * > &declList, bool (*pred )( Declaration * ), bool doDelete ) {
     198        std::list< Declaration * >::iterator i = declList.begin();
     199        while ( i != declList.end() ) {
     200            std::list< Declaration * >::iterator next = i;
     201            ++next;
     202            if ( pred( *i ) ) {
     203                if ( doDelete ) {
     204                    delete *i;
     205                }
     206                declList.erase( i );
     207            }
     208            i = next;
     209        }
     210    }
     211
     212    bool
     213    isStructOrUnion( Declaration *decl ) {
     214        return dynamic_cast< StructDecl * >( decl ) || dynamic_cast< UnionDecl * >( decl );
     215    }
     216
     217    template< typename AggDecl >
     218    void HoistStruct::handleAggregate( AggDecl *aggregateDecl ) {
     219        if ( inStruct ) {
     220            declsToAdd.push_back( aggregateDecl );
     221            Visitor::visit( aggregateDecl );
     222        } else {
     223            inStruct = true;
     224            Visitor::visit( aggregateDecl );
     225            inStruct = false;
     226            filter( aggregateDecl->get_members(), isStructOrUnion, false );
     227        }
     228    }
     229
     230    void HoistStruct::visit( StructDecl *aggregateDecl ) {
     231        handleAggregate( aggregateDecl );
     232    }
     233
     234    void HoistStruct::visit( UnionDecl *aggregateDecl ) {
     235        handleAggregate( aggregateDecl );
     236    }
     237
     238    void HoistStruct::visit( CompoundStmt *compoundStmt ) {
     239        addVisit( compoundStmt, *this );
     240    }
     241
     242    void HoistStruct::visit( IfStmt *ifStmt ) {
     243        addVisit( ifStmt, *this );
     244    }
     245
     246    void HoistStruct::visit( WhileStmt *whileStmt ) {
     247        addVisit( whileStmt, *this );
     248    }
     249
     250    void HoistStruct::visit( ForStmt *forStmt ) {
     251        addVisit( forStmt, *this );
     252    }
     253
     254    void HoistStruct::visit( SwitchStmt *switchStmt ) {
     255        addVisit( switchStmt, *this );
     256    }
     257
     258    void HoistStruct::visit( ChooseStmt *switchStmt ) {
     259        addVisit( switchStmt, *this );
     260    }
     261
     262    void HoistStruct::visit( CaseStmt *caseStmt ) {
     263        addVisit( caseStmt, *this );
     264    }
     265
     266    void HoistStruct::visit( CatchStmt *cathStmt ) {
     267        addVisit( cathStmt, *this );
     268    }
     269
     270    void Pass1::visit( EnumDecl *enumDecl ) {
     271        // Set the type of each member of the enumeration to be EnumConstant
     272 
     273        for( std::list< Declaration * >::iterator i = enumDecl->get_members().begin(); i != enumDecl->get_members().end(); ++i ) {
     274            ObjectDecl *obj = dynamic_cast< ObjectDecl * >( *i );
     275            assert( obj );
     276            obj->set_type( new EnumInstType( Type::Qualifiers( true, false, false, false ), enumDecl->get_name() ) );
     277        }
     278        Parent::visit( enumDecl );
     279    }
     280
     281    namespace {
     282        template< typename DWTIterator >
     283        void
     284        fixFunctionList( DWTIterator begin, DWTIterator end, FunctionType *func ) {
     285            // the only case in which "void" is valid is where it is the only one in the list; then
     286            // it should be removed entirely
     287            // other fix ups are handled by the FixFunction class
     288            if ( begin == end ) return;
     289            FixFunction fixer;
     290            DWTIterator i = begin;
     291            *i = (*i )->acceptMutator( fixer );
     292            if ( fixer.get_isVoid() ) {
     293                DWTIterator j = i;
     294                ++i;
     295                func->get_parameters().erase( j );
     296                if ( i != end ) {
     297                    throw SemanticError( "invalid type void in function type ", func );
     298                }
     299            } else {
     300                ++i;
     301                for( ; i != end; ++i ) {
     302                    FixFunction fixer;
     303                    *i = (*i )->acceptMutator( fixer );
     304                    if ( fixer.get_isVoid() ) {
     305                        throw SemanticError( "invalid type void in function type ", func );
     306                    }
     307                }
     308            }
     309        }
     310    }
     311
     312    void Pass1::visit( FunctionType *func ) {
     313        // Fix up parameters and return types
     314        fixFunctionList( func->get_parameters().begin(), func->get_parameters().end(), func );
     315        fixFunctionList( func->get_returnVals().begin(), func->get_returnVals().end(), func );
     316        Visitor::visit( func );
     317    }
     318
     319    Pass2::Pass2( bool doDebug, const Indexer *other_indexer )
     320        : Indexer( doDebug ) {
     321        if ( other_indexer ) {
     322            indexer = other_indexer;
     323        } else {
     324            indexer = this;
     325        }
     326    }
     327
     328    void Pass2::visit( StructInstType *structInst ) {
     329        Parent::visit( structInst );
     330        StructDecl *st = indexer->lookupStruct( structInst->get_name() );
     331        // it's not a semantic error if the struct is not found, just an implicit forward declaration
     332        if ( st ) {
     333            assert( ! structInst->get_baseStruct() || structInst->get_baseStruct()->get_members().empty() || ! st->get_members().empty() );
     334            structInst->set_baseStruct( st );
     335        }
     336        if ( ! st || st->get_members().empty() ) {
     337            // use of forward declaration
     338            forwardStructs[ structInst->get_name() ].push_back( structInst );
     339        }
     340    }
     341
     342    void Pass2::visit( UnionInstType *unionInst ) {
     343        Parent::visit( unionInst );
     344        UnionDecl *un = indexer->lookupUnion( unionInst->get_name() );
     345        // it's not a semantic error if the union is not found, just an implicit forward declaration
     346        if ( un ) {
     347            unionInst->set_baseUnion( un );
     348        }
     349        if ( ! un || un->get_members().empty() ) {
     350            // use of forward declaration
     351            forwardUnions[ unionInst->get_name() ].push_back( unionInst );
     352        }
     353    }
     354
     355    void Pass2::visit( ContextInstType *contextInst ) {
     356        Parent::visit( contextInst );
     357        ContextDecl *ctx = indexer->lookupContext( contextInst->get_name() );
     358        if ( ! ctx ) {
     359            throw SemanticError( "use of undeclared context " + contextInst->get_name() );
     360        }
     361        for( std::list< TypeDecl * >::const_iterator i = ctx->get_parameters().begin(); i != ctx->get_parameters().end(); ++i ) {
     362            for( std::list< DeclarationWithType * >::const_iterator assert = (*i )->get_assertions().begin(); assert != (*i )->get_assertions().end(); ++assert ) {
     363                if ( ContextInstType *otherCtx = dynamic_cast< ContextInstType * >(*assert ) ) {
     364                    cloneAll( otherCtx->get_members(), contextInst->get_members() );
     365                } else {
     366                    contextInst->get_members().push_back( (*assert )->clone() );
     367                }
     368            }
     369        }
     370        applySubstitution( ctx->get_parameters().begin(), ctx->get_parameters().end(), contextInst->get_parameters().begin(), ctx->get_members().begin(), ctx->get_members().end(), back_inserter( contextInst->get_members() ) );
     371    }
     372
     373    void Pass2::visit( StructDecl *structDecl ) {
     374        if ( ! structDecl->get_members().empty() ) {
     375            ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->get_name() );
     376            if ( fwds != forwardStructs.end() ) {
     377                for( std::list< StructInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
     378                    (*inst )->set_baseStruct( structDecl );
     379                }
     380                forwardStructs.erase( fwds );
     381            }
     382        }
     383        Indexer::visit( structDecl );
     384    }
     385
     386    void Pass2::visit( UnionDecl *unionDecl ) {
     387        if ( ! unionDecl->get_members().empty() ) {
     388            ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->get_name() );
     389            if ( fwds != forwardUnions.end() ) {
     390                for( std::list< UnionInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
     391                    (*inst )->set_baseUnion( unionDecl );
     392                }
     393                forwardUnions.erase( fwds );
     394            }
     395        }
     396        Indexer::visit( unionDecl );
     397    }
     398
     399    void Pass2::visit( TypeInstType *typeInst ) {
     400        if ( NamedTypeDecl *namedTypeDecl = lookupType( typeInst->get_name() ) ) {
     401            if ( TypeDecl *typeDecl = dynamic_cast< TypeDecl * >( namedTypeDecl ) ) {
     402                typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype );
     403            }
     404        }
     405    }
     406
     407    Pass3::Pass3( const Indexer *other_indexer )
     408        : Indexer( false ) {
     409        if ( other_indexer ) {
     410            indexer = other_indexer;
     411        } else {
     412            indexer = this;
     413        }
     414    }
     415
     416    void forallFixer( Type *func ) {
     417        // Fix up assertions
     418        for( std::list< TypeDecl * >::iterator type = func->get_forall().begin(); type != func->get_forall().end(); ++type ) {
     419            std::list< DeclarationWithType * > toBeDone, nextRound;
     420            toBeDone.splice( toBeDone.end(), (*type )->get_assertions() );
     421            while ( ! toBeDone.empty() ) {
     422                for( std::list< DeclarationWithType * >::iterator assertion = toBeDone.begin(); assertion != toBeDone.end(); ++assertion ) {
     423                    if ( ContextInstType *ctx = dynamic_cast< ContextInstType * >( (*assertion )->get_type() ) ) {
     424                        for( std::list< Declaration * >::const_iterator i = ctx->get_members().begin(); i != ctx->get_members().end(); ++i ) {
     425                            DeclarationWithType *dwt = dynamic_cast< DeclarationWithType * >( *i );
     426                            assert( dwt );
     427                            nextRound.push_back( dwt->clone() );
     428                        }
     429                        delete ctx;
     430                    } else {
     431                        FixFunction fixer;
     432                        *assertion = (*assertion )->acceptMutator( fixer );
     433                        if ( fixer.get_isVoid() ) {
     434                            throw SemanticError( "invalid type void in assertion of function ", func );
     435                        }
     436                        (*type )->get_assertions().push_back( *assertion );
     437                    }
     438                }
     439                toBeDone.clear();
     440                toBeDone.splice( toBeDone.end(), nextRound );
     441            }
     442        }
     443    }
     444
     445    void Pass3::visit( ObjectDecl *object ) {
     446        forallFixer( object->get_type() );
     447        if ( PointerType *pointer = dynamic_cast< PointerType * >( object->get_type() ) ) {
     448            forallFixer( pointer->get_base() );
     449        }
     450        Parent::visit( object );
     451        object->fixUniqueId();
     452    }
     453
     454    void Pass3::visit( FunctionDecl *func ) {
     455        forallFixer( func->get_type() );
     456        Parent::visit( func );
     457        func->fixUniqueId();
     458    }
     459
     460    static const std::list< std::string > noLabels;
     461
     462    void AddStructAssignment::addStructAssignment( std::list< Declaration * > &translationUnit ) {
     463        AddStructAssignment visitor;
     464        acceptAndAdd( translationUnit, visitor, false );
     465    }
     466
     467    template< typename OutputIterator >
     468    void makeScalarAssignment( ObjectDecl *srcParam, ObjectDecl *dstParam, DeclarationWithType *member, OutputIterator out ) {
     469        ObjectDecl *obj = dynamic_cast<ObjectDecl *>( member ); // PAB: unnamed bit fields are not copied
     470        if ( obj != NULL && obj->get_name() == "" && obj->get_bitfieldWidth() != NULL ) return;
     471
     472        UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
     473 
     474        UntypedExpr *derefExpr = new UntypedExpr( new NameExpr( "*?" ) );
     475        derefExpr->get_args().push_back( new VariableExpr( dstParam ) );
     476 
     477        // do something special for unnamed members
     478        Expression *dstselect = new AddressExpr( new MemberExpr( member, derefExpr ) );
     479        assignExpr->get_args().push_back( dstselect );
     480 
     481        Expression *srcselect = new MemberExpr( member, new VariableExpr( srcParam ) );
     482        assignExpr->get_args().push_back( srcselect );
     483 
     484        *out++ = new ExprStmt( noLabels, assignExpr );
     485    }
     486
     487    template< typename OutputIterator >
     488    void makeArrayAssignment( ObjectDecl *srcParam, ObjectDecl *dstParam, DeclarationWithType *member, ArrayType *array, OutputIterator out ) {
     489        static UniqueName indexName( "_index" );
     490 
     491        // for a flexible array member nothing is done -- user must define own assignment
     492        if ( ! array->get_dimension() ) return;
     493 
     494        ObjectDecl *index = new ObjectDecl( indexName.newName(), Declaration::NoStorageClass, LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), 0 );
     495        *out++ = new DeclStmt( noLabels, index );
     496 
     497        UntypedExpr *init = new UntypedExpr( new NameExpr( "?=?" ) );
     498        init->get_args().push_back( new AddressExpr( new VariableExpr( index ) ) );
     499        init->get_args().push_back( new NameExpr( "0" ) );
     500        Statement *initStmt = new ExprStmt( noLabels, init );
     501 
     502        UntypedExpr *cond = new UntypedExpr( new NameExpr( "?<?" ) );
     503        cond->get_args().push_back( new VariableExpr( index ) );
     504        cond->get_args().push_back( array->get_dimension()->clone() );
     505 
     506        UntypedExpr *inc = new UntypedExpr( new NameExpr( "++?" ) );
     507        inc->get_args().push_back( new AddressExpr( new VariableExpr( index ) ) );
     508 
     509        UntypedExpr *assignExpr = new UntypedExpr( new NameExpr( "?=?" ) );
     510 
     511        UntypedExpr *derefExpr = new UntypedExpr( new NameExpr( "*?" ) );
     512        derefExpr->get_args().push_back( new VariableExpr( dstParam ) );
     513 
     514        Expression *dstselect = new MemberExpr( member, derefExpr );
     515        UntypedExpr *dstIndex = new UntypedExpr( new NameExpr( "?+?" ) );
     516        dstIndex->get_args().push_back( dstselect );
     517        dstIndex->get_args().push_back( new VariableExpr( index ) );
     518        assignExpr->get_args().push_back( dstIndex );
     519 
     520        Expression *srcselect = new MemberExpr( member, new VariableExpr( srcParam ) );
     521        UntypedExpr *srcIndex = new UntypedExpr( new NameExpr( "?[?]" ) );
     522        srcIndex->get_args().push_back( srcselect );
     523        srcIndex->get_args().push_back( new VariableExpr( index ) );
     524        assignExpr->get_args().push_back( srcIndex );
     525 
     526        *out++ = new ForStmt( noLabels, initStmt, cond, inc, new ExprStmt( noLabels, assignExpr ) );
     527    }
     528
     529    Declaration *makeStructAssignment( StructDecl *aggregateDecl, StructInstType *refType ) {
     530        FunctionType *assignType = new FunctionType( Type::Qualifiers(), false );
     531 
     532        ObjectDecl *returnVal = new ObjectDecl( "", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType->clone(), 0 );
     533        assignType->get_returnVals().push_back( returnVal );
     534 
     535        ObjectDecl *dstParam = new ObjectDecl( "_dst", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), refType->clone() ), 0 );
     536        assignType->get_parameters().push_back( dstParam );
     537 
     538        ObjectDecl *srcParam = new ObjectDecl( "_src", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType, 0 );
     539        assignType->get_parameters().push_back( srcParam );
     540 
     541        FunctionDecl *assignDecl = new FunctionDecl( "?=?", Declaration::Static, LinkageSpec::AutoGen, assignType, new CompoundStmt( noLabels ), true );
     542        assignDecl->fixUniqueId();
     543 
     544        for( std::list< Declaration * >::const_iterator member = aggregateDecl->get_members().begin(); member != aggregateDecl->get_members().end(); ++member ) {
     545            if ( DeclarationWithType *dwt = dynamic_cast< DeclarationWithType * >( *member ) ) {
     546                if ( ArrayType *array = dynamic_cast< ArrayType * >( dwt->get_type() ) ) {
     547                    makeArrayAssignment( srcParam, dstParam, dwt, array, back_inserter( assignDecl->get_statements()->get_kids() ) );
     548                } else {
     549                    makeScalarAssignment( srcParam, dstParam, dwt, back_inserter( assignDecl->get_statements()->get_kids() ) );
     550                }
     551            }
     552        }
     553        assignDecl->get_statements()->get_kids().push_back( new ReturnStmt( noLabels, new VariableExpr( srcParam ) ) );
     554 
     555        return assignDecl;
     556    }
     557
     558    Declaration *makeUnionAssignment( UnionDecl *aggregateDecl, UnionInstType *refType ) {
     559        FunctionType *assignType = new FunctionType( Type::Qualifiers(), false );
     560 
     561        ObjectDecl *returnVal = new ObjectDecl( "", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType->clone(), 0 );
     562        assignType->get_returnVals().push_back( returnVal );
     563 
     564        ObjectDecl *dstParam = new ObjectDecl( "_dst", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), refType->clone() ), 0 );
     565        assignType->get_parameters().push_back( dstParam );
     566 
     567        ObjectDecl *srcParam = new ObjectDecl( "_src", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, refType, 0 );
     568        assignType->get_parameters().push_back( srcParam );
     569 
     570        FunctionDecl *assignDecl = new FunctionDecl( "?=?", Declaration::Static, LinkageSpec::AutoGen, assignType, new CompoundStmt( noLabels ), true );
     571        assignDecl->fixUniqueId();
     572 
     573        UntypedExpr *copy = new UntypedExpr( new NameExpr( "__builtin_memcpy" ) );
     574        copy->get_args().push_back( new VariableExpr( dstParam ) );
     575        copy->get_args().push_back( new AddressExpr( new VariableExpr( srcParam ) ) );
     576        copy->get_args().push_back( new SizeofExpr( refType->clone() ) );
     577
     578        assignDecl->get_statements()->get_kids().push_back( new ExprStmt( noLabels, copy ) );
     579        assignDecl->get_statements()->get_kids().push_back( new ReturnStmt( noLabels, new VariableExpr( srcParam ) ) );
     580 
     581        return assignDecl;
     582    }
     583
     584    void AddStructAssignment::visit( StructDecl *structDecl ) {
     585        if ( ! structDecl->get_members().empty() && structsDone.find( structDecl->get_name() ) == structsDone.end() ) {
     586            StructInstType *structInst = new StructInstType( Type::Qualifiers(), structDecl->get_name() );
     587            structInst->set_baseStruct( structDecl );
     588            declsToAdd.push_back( makeStructAssignment( structDecl, structInst ) );
     589            structsDone.insert( structDecl->get_name() );
     590        }
     591    }
     592
     593    void AddStructAssignment::visit( UnionDecl *unionDecl ) {
     594        if ( ! unionDecl->get_members().empty() ) {
     595            UnionInstType *unionInst = new UnionInstType( Type::Qualifiers(), unionDecl->get_name() );
     596            unionInst->set_baseUnion( unionDecl );
     597            declsToAdd.push_back( makeUnionAssignment( unionDecl, unionInst ) );
     598        }
     599    }
     600
     601    void AddStructAssignment::visit( TypeDecl *typeDecl ) {
     602        CompoundStmt *stmts = 0;
     603        TypeInstType *typeInst = new TypeInstType( Type::Qualifiers(), typeDecl->get_name(), false );
     604        typeInst->set_baseType( typeDecl );
     605        ObjectDecl *src = new ObjectDecl( "_src", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, typeInst->clone(), 0 );
     606        ObjectDecl *dst = new ObjectDecl( "_dst", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, new PointerType( Type::Qualifiers(), typeInst->clone() ), 0 );
     607        if ( typeDecl->get_base() ) {
     608            stmts = new CompoundStmt( std::list< Label >() );
     609            UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
     610            assign->get_args().push_back( new CastExpr( new VariableExpr( dst ), new PointerType( Type::Qualifiers(), typeDecl->get_base()->clone() ) ) );
     611            assign->get_args().push_back( new CastExpr( new VariableExpr( src ), typeDecl->get_base()->clone() ) );
     612            stmts->get_kids().push_back( new ReturnStmt( std::list< Label >(), assign ) );
     613        }
     614        FunctionType *type = new FunctionType( Type::Qualifiers(), false );
     615        type->get_returnVals().push_back( new ObjectDecl( "", Declaration::NoStorageClass, LinkageSpec::Cforall, 0, typeInst, 0 ) );
     616        type->get_parameters().push_back( dst );
     617        type->get_parameters().push_back( src );
     618        FunctionDecl *func = new FunctionDecl( "?=?", Declaration::NoStorageClass, LinkageSpec::AutoGen, type, stmts, false );
     619        declsToAdd.push_back( func );
     620    }
     621
     622    void addDecls( std::list< Declaration * > &declsToAdd, std::list< Statement * > &statements, std::list< Statement * >::iterator i ) {
     623        if ( ! declsToAdd.empty() ) {
     624            for( std::list< Declaration * >::iterator decl = declsToAdd.begin(); decl != declsToAdd.end(); ++decl ) {
     625                statements.insert( i, new DeclStmt( noLabels, *decl ) );
     626            }
     627            declsToAdd.clear();
     628        }
     629    }
     630
     631    void AddStructAssignment::visit( FunctionType *) {
     632        // ensure that we don't add assignment ops for types defined
     633        // as part of the function
     634    }
     635
     636    void AddStructAssignment::visit( PointerType *) {
     637        // ensure that we don't add assignment ops for types defined
     638        // as part of the pointer
     639    }
     640
     641    void AddStructAssignment::visit( ContextDecl *) {
     642        // ensure that we don't add assignment ops for types defined
     643        // as part of the context
     644    }
     645
     646    template< typename StmtClass >
     647    inline void AddStructAssignment::visitStatement( StmtClass *stmt ) {
     648        std::set< std::string > oldStructs = structsDone;
     649        addVisit( stmt, *this );
     650        structsDone = oldStructs;
     651    }
     652
     653    void AddStructAssignment::visit( CompoundStmt *compoundStmt ) {
     654        visitStatement( compoundStmt );
     655    }
     656
     657    void AddStructAssignment::visit( IfStmt *ifStmt ) {
     658        visitStatement( ifStmt );
     659    }
     660
     661    void AddStructAssignment::visit( WhileStmt *whileStmt ) {
     662        visitStatement( whileStmt );
     663    }
     664
     665    void AddStructAssignment::visit( ForStmt *forStmt ) {
     666        visitStatement( forStmt );
     667    }
     668
     669    void AddStructAssignment::visit( SwitchStmt *switchStmt ) {
     670        visitStatement( switchStmt );
     671    }
     672
     673    void AddStructAssignment::visit( ChooseStmt *switchStmt ) {
     674        visitStatement( switchStmt );
     675    }
     676
     677    void AddStructAssignment::visit( CaseStmt *caseStmt ) {
     678        visitStatement( caseStmt );
     679    }
     680
     681    void AddStructAssignment::visit( CatchStmt *cathStmt ) {
     682        visitStatement( cathStmt );
     683    }
     684
     685    bool isTypedef( Declaration *decl ) {
     686        return dynamic_cast< TypedefDecl * >( decl );
     687    }
     688
     689    void EliminateTypedef::eliminateTypedef( std::list< Declaration * > &translationUnit ) {
     690        EliminateTypedef eliminator;
     691        mutateAll( translationUnit, eliminator );
     692        filter( translationUnit, isTypedef, true );
     693    }
     694
     695    Type *EliminateTypedef::mutate( TypeInstType *typeInst ) {
     696        std::map< std::string, TypedefDecl * >::const_iterator def = typedefNames.find( typeInst->get_name() );
     697        if ( def != typedefNames.end() ) {
     698            Type *ret = def->second->get_base()->clone();
     699            ret->get_qualifiers() += typeInst->get_qualifiers();
     700            delete typeInst;
     701            return ret;
     702        }
     703        return typeInst;
     704    }
     705
     706    Declaration *EliminateTypedef::mutate( TypedefDecl *tyDecl ) {
     707        Declaration *ret = Mutator::mutate( tyDecl );
     708        typedefNames[ tyDecl->get_name() ] = tyDecl;
     709        if ( AggregateDecl *aggDecl = dynamic_cast< AggregateDecl * >( tyDecl->get_base() ) ) {
     710            tyDecl->set_base( 0 );
     711            delete tyDecl;
     712            return aggDecl;
     713        } else {
     714            return ret;
     715        }
     716    }
     717
     718    TypeDecl *EliminateTypedef::mutate( TypeDecl *typeDecl ) {
     719        std::map< std::string, TypedefDecl * >::iterator i = typedefNames.find( typeDecl->get_name() );
     720        if ( i != typedefNames.end() ) {
     721            typedefNames.erase( i ) ;
     722        }
     723        return typeDecl;
     724    }
     725
     726    DeclarationWithType *EliminateTypedef::mutate( FunctionDecl *funcDecl ) {
     727        std::map< std::string, TypedefDecl * > oldNames = typedefNames;
     728        DeclarationWithType *ret = Mutator::mutate( funcDecl );
     729        typedefNames = oldNames;
     730        return ret;
     731    }
     732
     733    ObjectDecl *EliminateTypedef::mutate( ObjectDecl *objDecl ) {
     734        std::map< std::string, TypedefDecl * > oldNames = typedefNames;
     735        ObjectDecl *ret = Mutator::mutate( objDecl );
     736        typedefNames = oldNames;
     737        return ret;
     738    }
     739
     740    Expression *EliminateTypedef::mutate( CastExpr *castExpr ) {
     741        std::map< std::string, TypedefDecl * > oldNames = typedefNames;
     742        Expression *ret = Mutator::mutate( castExpr );
     743        typedefNames = oldNames;
     744        return ret;
     745    }
     746
     747    CompoundStmt *EliminateTypedef::mutate( CompoundStmt *compoundStmt ) {
     748        std::map< std::string, TypedefDecl * > oldNames = typedefNames;
     749        CompoundStmt *ret = Mutator::mutate( compoundStmt );
     750        std::list< Statement * >::iterator i = compoundStmt->get_kids().begin();
     751        while ( i != compoundStmt->get_kids().end() ) {
     752            std::list< Statement * >::iterator next = i;
     753            ++next;
     754            if ( DeclStmt *declStmt = dynamic_cast< DeclStmt * >( *i ) ) {
     755                if ( dynamic_cast< TypedefDecl * >( declStmt->get_decl() ) ) {
     756                    delete *i;
     757                    compoundStmt->get_kids().erase( i );
     758                }
     759            }
     760            i = next;
     761        }
     762        typedefNames = oldNames;
     763        return ret;
     764    }
    910765} // namespace SymTab
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