source: translator/SymTab/Indexer.cc @ 02e9ae2

#include "SynTree/Declaration.h"
#include "SynTree/Type.h"
#include "SynTree/Expression.h"
#include "SynTree/Initializer.h"
#include "SynTree/Statement.h"
#include "Indexer.h"
#include <typeinfo>
#include "utility.h"

#define debugPrint(x) if ( doDebug ) { std::cout << x; }

namespace SymTab {
    Indexer::Indexer( bool useDebug ) : doDebug( useDebug ) {}

    Indexer::~Indexer() {}

    void Indexer::visit( ObjectDecl *objectDecl ) {
        maybeAccept( objectDecl->get_type(), *this );
        maybeAccept( objectDecl->get_init(), *this );
        maybeAccept( objectDecl->get_bitfieldWidth(), *this );
        if ( objectDecl->get_name() != "" ) {
            debugPrint( "Adding object " << objectDecl->get_name() << std::endl );
            idTable.addDecl( objectDecl );
        }
    }

    void Indexer::visit( FunctionDecl *functionDecl ) {
        if ( functionDecl->get_name() == "" ) return;
        debugPrint( "Adding function " << functionDecl->get_name() << std::endl );
        idTable.addDecl( functionDecl );
        enterScope();
        maybeAccept( functionDecl->get_functionType(), *this );
        acceptAll( functionDecl->get_oldDecls(), *this );
        maybeAccept( functionDecl->get_statements(), *this );
        leaveScope();
    }

/********
 * A NOTE ON THE ORDER OF TRAVERSAL
 *
 * Types and typedefs have their base types visited before they are added to the type table.
 * This is ok, since there is no such thing as a recursive type or typedef.
 *             typedef struct { T *x; } T; // never allowed
 *
 * for structs/unions, it is possible to have recursion, so the decl should be added as if it's
 * incomplete to begin, the members are traversed, and then the complete type should be added
 * (assuming the type is completed by this particular declaration).
 *             struct T { struct T *x; }; // allowed
 *
 * It's important to add the complete type to the symbol table *after* the members/base has been
 * traversed, since that traversal may modify the definition of the type and these modifications
 * should be visible when the symbol table is queried later in this pass.
 *
 * TODO: figure out whether recursive contexts are sensible/possible/reasonable.
 */

    void Indexer::visit( TypeDecl *typeDecl ) {
        // see A NOTE ON THE ORDER OF TRAVERSAL, above
        // note that assertions come after the type is added to the symtab, since they aren't part
        // of the type proper and may depend on the type itself
        enterScope();
        acceptAll( typeDecl->get_parameters(), *this );
        maybeAccept( typeDecl->get_base(), *this );
        leaveScope();
        debugPrint( "Adding type " << typeDecl->get_name() << std::endl );
        typeTable.add( typeDecl );
        acceptAll( typeDecl->get_assertions(), *this );
    }

    void Indexer::visit( TypedefDecl *typeDecl ) {
        enterScope();
        acceptAll( typeDecl->get_parameters(), *this );
        maybeAccept( typeDecl->get_base(), *this );
        leaveScope();
        debugPrint( "Adding typedef " << typeDecl->get_name() << std::endl );
        typeTable.add( typeDecl );
    }

    void Indexer::visit( StructDecl *aggregateDecl ) {
        // make up a forward declaration and add it before processing the members
        StructDecl fwdDecl( aggregateDecl->get_name() );
        cloneAll( aggregateDecl->get_parameters(), fwdDecl.get_parameters() );
        debugPrint( "Adding fwd decl for struct " << fwdDecl.get_name() << std::endl );
        structTable.add( &fwdDecl );
  
        enterScope();
        acceptAll( aggregateDecl->get_parameters(), *this );
        acceptAll( aggregateDecl->get_members(), *this );
        leaveScope();
  
        debugPrint( "Adding struct " << aggregateDecl->get_name() << std::endl );
        // this addition replaces the forward declaration
        structTable.add( aggregateDecl );
    }

    void Indexer::visit( UnionDecl *aggregateDecl ) {
        // make up a forward declaration and add it before processing the members
        UnionDecl fwdDecl( aggregateDecl->get_name() );
        cloneAll( aggregateDecl->get_parameters(), fwdDecl.get_parameters() );
        debugPrint( "Adding fwd decl for union " << fwdDecl.get_name() << std::endl );
        unionTable.add( &fwdDecl );
  
        enterScope();
        acceptAll( aggregateDecl->get_parameters(), *this );
        acceptAll( aggregateDecl->get_members(), *this );
        leaveScope();
  
        debugPrint( "Adding union " << aggregateDecl->get_name() << std::endl );
        unionTable.add( aggregateDecl );
    }

    void Indexer::visit( EnumDecl *aggregateDecl ) {
        debugPrint( "Adding enum " << aggregateDecl->get_name() << std::endl );
        enumTable.add( aggregateDecl );
        // unlike structs, contexts, and unions, enums inject their members into the global scope
        acceptAll( aggregateDecl->get_members(), *this );
    }

    void Indexer::visit( ContextDecl *aggregateDecl ) {
        enterScope();
        acceptAll( aggregateDecl->get_parameters(), *this );
        acceptAll( aggregateDecl->get_members(), *this );
        leaveScope();
  
        debugPrint( "Adding context " << aggregateDecl->get_name() << std::endl );
        contextTable.add( aggregateDecl );
    }

    void Indexer::visit( CompoundStmt *compoundStmt ) {
        enterScope();
        acceptAll( compoundStmt->get_kids(), *this );
        leaveScope();
    }

    void Indexer::visit( ContextInstType *contextInst ) {
        acceptAll( contextInst->get_parameters(), *this );
        acceptAll( contextInst->get_members(), *this );
    }

    void Indexer::visit( StructInstType *structInst ) {
        if ( ! structTable.lookup( structInst->get_name() ) ) {
            debugPrint( "Adding struct " << structInst->get_name() << " from implicit forward declaration" << std::endl );
            structTable.add( structInst->get_name() );
        }
        enterScope();
        acceptAll( structInst->get_parameters(), *this );
        leaveScope();
    }

    void Indexer::visit( UnionInstType *unionInst ) {
        if ( ! unionTable.lookup( unionInst->get_name() ) ) {
            debugPrint( "Adding union " << unionInst->get_name() << " from implicit forward declaration" << std::endl );
            unionTable.add( unionInst->get_name() );
        }
        enterScope();
        acceptAll( unionInst->get_parameters(), *this );
        leaveScope();
    }

    void Indexer::lookupId( const std::string &id, std::list< DeclarationWithType* > &list ) const {
        idTable.lookupId( id, list );
    }

    NamedTypeDecl *Indexer::lookupType( const std::string &id ) const {
        return typeTable.lookup( id );
    }

    StructDecl *Indexer::lookupStruct( const std::string &id ) const {
        return structTable.lookup( id );
    }

    EnumDecl *Indexer::lookupEnum( const std::string &id ) const {
        return enumTable.lookup( id );
    }

    UnionDecl *Indexer::lookupUnion( const std::string &id ) const {
        return unionTable.lookup( id );
    }

    ContextDecl  * Indexer::lookupContext( const std::string &id ) const {
        return contextTable.lookup( id );
    }

    void Indexer::enterScope() {
        if ( doDebug ) {
            std::cout << "--- Entering scope" << std::endl;
        }
        idTable.enterScope();
        typeTable.enterScope();
        structTable.enterScope();
        enumTable.enterScope();
        unionTable.enterScope();
        contextTable.enterScope();
    }

    void Indexer::leaveScope() {
        using std::cout;
        using std::endl;
  
        if ( doDebug ) {
            cout << "--- Leaving scope containing" << endl;
            idTable.dump( cout );
            typeTable.dump( cout );
            structTable.dump( cout );
            enumTable.dump( cout );
            unionTable.dump( cout );
            contextTable.dump( cout );
        }
        idTable.leaveScope();
        typeTable.leaveScope();
        structTable.leaveScope();
        enumTable.leaveScope();
        unionTable.leaveScope();
        contextTable.leaveScope();
    }

    void Indexer::print( std::ostream &os, int indent ) const {
        idTable.dump( os );
        typeTable.dump( os );
        structTable.dump( os );
        enumTable.dump( os );
        unionTable.dump( os );
        contextTable.dump( os );
    }
} // namespace SymTab