source: src/Parser/DeclarationNode.cc @ 17a0ede2

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// DeclarationNode.cc --
//
// Author           : Rodolfo G. Esteves
// Created On       : Sat May 16 12:34:05 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Feb  1 16:49:17 2019
// Update Count     : 1113
//

#include <cassert>                 // for assert, assertf, strict_dynamic_cast
#include <iterator>                // for back_insert_iterator
#include <list>                    // for list
#include <memory>                  // for unique_ptr
#include <ostream>                 // for operator<<, ostream, basic_ostream
#include <string>                  // for string, operator+, allocator, char...

#include "Common/SemanticError.h"  // for SemanticError
#include "Common/UniqueName.h"     // for UniqueName
#include "Common/utility.h"        // for maybeClone, maybeBuild, CodeLocation
#include "Parser/LinkageSpec.h"    // for Spec, linkageName, Cforall
#include "Parser/ParseNode.h"      // for DeclarationNode, ExpressionNode
#include "SynTree/Attribute.h"     // for Attribute
#include "SynTree/Declaration.h"   // for TypeDecl, ObjectDecl, Declaration
#include "SynTree/Expression.h"    // for Expression, ConstantExpr
#include "SynTree/Statement.h"     // for AsmStmt
#include "SynTree/Type.h"          // for Type, Type::StorageClasses, Type::...
#include "TypeData.h"              // for TypeData, TypeData::Aggregate_t
#include "TypedefTable.h"          // for TypedefTable

class Initializer;

extern TypedefTable typedefTable;

using namespace std;

// These must harmonize with the corresponding DeclarationNode enumerations.
const char * DeclarationNode::basicTypeNames[] = { "void", "_Bool", "char", "int", "int128",
                                                                                                   "float", "double", "long double", "float80", "float128",
                                                                                                   "_float16", "_float32", "_float32x", "_float64", "_float64x", "_float128", "_float128x", "NoBasicTypeNames" };
const char * DeclarationNode::complexTypeNames[] = { "_Complex", "NoComplexTypeNames", "_Imaginary" }; // Imaginary unsupported => parse, but make invisible and print error message
const char * DeclarationNode::signednessNames[] = { "signed", "unsigned", "NoSignednessNames" };
const char * DeclarationNode::lengthNames[] = { "short", "long", "long long", "NoLengthNames" };
const char * DeclarationNode::aggregateNames[] = { "struct", "union", "trait", "coroutine", "monitor", "thread", "NoAggregateNames" };
const char * DeclarationNode::typeClassNames[] = { "otype", "dtype", "ftype", "NoTypeClassNames" };
const char * DeclarationNode::builtinTypeNames[] = { "__builtin_va_list", "zero_t", "one_t", "NoBuiltinTypeNames" };

UniqueName DeclarationNode::anonymous( "__anonymous" );

extern LinkageSpec::Spec linkage;                                               // defined in parser.yy

DeclarationNode::DeclarationNode() :
        linkage( ::linkage ) {

//      variable.name = nullptr;
        variable.tyClass = NoTypeClass;
        variable.assertions = nullptr;
        variable.initializer = nullptr;

//      attr.name = nullptr;
        attr.expr = nullptr;
        attr.type = nullptr;

        assert.condition = nullptr;
        assert.message = nullptr;
}

DeclarationNode::~DeclarationNode() {
//      delete attr.name;
        delete attr.expr;
        delete attr.type;

//      delete variable.name;
        delete variable.assertions;
        delete variable.initializer;

        delete type;
        delete bitfieldWidth;

        delete asmStmt;
        // asmName, no delete, passed to next stage
        delete initializer;

        delete assert.condition;
        delete assert.message;
}

DeclarationNode * DeclarationNode::clone() const {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->set_next( maybeClone( get_next() ) );
        newnode->name = name ? new string( *name ) : nullptr;

        newnode->builtin = NoBuiltinType;
        newnode->type = maybeClone( type );
        newnode->inLine = inLine;
        newnode->storageClasses = storageClasses;
        newnode->funcSpecs = funcSpecs;
        newnode->bitfieldWidth = maybeClone( bitfieldWidth );
        newnode->enumeratorValue.reset( maybeClone( enumeratorValue.get() ) );
        newnode->hasEllipsis = hasEllipsis;
        newnode->linkage = linkage;
        newnode->asmName = maybeClone( asmName );
        cloneAll( attributes, newnode->attributes );
        newnode->initializer = maybeClone( initializer );
        newnode->extension = extension;
        newnode->asmStmt = maybeClone( asmStmt );
        newnode->error = error;

//      newnode->variable.name = variable.name ? new string( *variable.name ) : nullptr;
        newnode->variable.tyClass = variable.tyClass;
        newnode->variable.assertions = maybeClone( variable.assertions );
        newnode->variable.initializer = maybeClone( variable.initializer );

//      newnode->attr.name = attr.name ? new string( *attr.name ) : nullptr;
        newnode->attr.expr = maybeClone( attr.expr );
        newnode->attr.type = maybeClone( attr.type );

        newnode->assert.condition = maybeClone( assert.condition );
        newnode->assert.message = maybeClone( assert.message );
        return newnode;
} // DeclarationNode::clone

void DeclarationNode::print( std::ostream & os, int indent ) const {
        os << string( indent, ' ' );
        if ( name ) {
                os << *name << ": ";
        } else {
                os << "unnamed: ";
        } // if

        if ( linkage != LinkageSpec::Cforall ) {
                os << LinkageSpec::linkageName( linkage ) << " ";
        } // if

        storageClasses.print( os );
        funcSpecs.print( os );

        if ( type ) {
                type->print( os, indent );
        } else {
                os << "untyped entity ";
        } // if

        if ( bitfieldWidth ) {
                os << endl << string( indent + 2, ' ' ) << "with bitfield width ";
                bitfieldWidth->printOneLine( os );
        } // if

        if ( initializer ) {
                os << endl << string( indent + 2, ' ' ) << "with initializer ";
                initializer->printOneLine( os );
                os << " maybe constructed? " << initializer->get_maybeConstructed();

        } // if

        os << endl;
}

void DeclarationNode::printList( std::ostream & os, int indent ) const {
        ParseNode::printList( os, indent );
        if ( hasEllipsis ) {
                os << string( indent, ' ' )  << "and a variable number of other arguments" << endl;
        } // if
}

DeclarationNode * DeclarationNode::newFunction( const string * name, DeclarationNode * ret, DeclarationNode * param, StatementNode * body ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->name = name;
        newnode->type = new TypeData( TypeData::Function );
        newnode->type->function.params = param;
        newnode->type->function.body = body;

        if ( ret ) {
                newnode->type->base = ret->type;
                ret->type = nullptr;
                delete ret;
        } // if

        return newnode;
} // DeclarationNode::newFunction


DeclarationNode * DeclarationNode::newStorageClass( Type::StorageClasses sc ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->storageClasses = sc;
        return newnode;
} // DeclarationNode::newStorageClass

DeclarationNode * DeclarationNode::newFuncSpecifier( Type::FuncSpecifiers fs ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->funcSpecs = fs;
        return newnode;
} // DeclarationNode::newFuncSpecifier

DeclarationNode * DeclarationNode::newTypeQualifier( Type::Qualifiers tq ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData();
        newnode->type->qualifiers = tq;
        return newnode;
} // DeclarationNode::newQualifier

DeclarationNode * DeclarationNode::newBasicType( BasicType bt ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Basic );
        newnode->type->basictype = bt;
        return newnode;
} // DeclarationNode::newBasicType

DeclarationNode * DeclarationNode::newComplexType( ComplexType ct ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Basic );
        newnode->type->complextype = ct;
        return newnode;
} // DeclarationNode::newComplexType

DeclarationNode * DeclarationNode::newSignedNess( Signedness sn ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Basic );
        newnode->type->signedness = sn;
        return newnode;
} // DeclarationNode::newSignedNess

DeclarationNode * DeclarationNode::newLength( Length lnth ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Basic );
        newnode->type->length = lnth;
        return newnode;
} // DeclarationNode::newLength

DeclarationNode * DeclarationNode::newForall( DeclarationNode * forall ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Unknown );
        newnode->type->forall = forall;
        return newnode;
} // DeclarationNode::newForall

DeclarationNode * DeclarationNode::newFromTypedef( const string * name ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::SymbolicInst );
        newnode->type->symbolic.name = name;
        newnode->type->symbolic.isTypedef = true;
        newnode->type->symbolic.params = nullptr;
        return newnode;
} // DeclarationNode::newFromTypedef

DeclarationNode * DeclarationNode::newFromGlobalScope() {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::GlobalScope );
        return newnode;
}

DeclarationNode * DeclarationNode::newQualifiedType( DeclarationNode * parent, DeclarationNode * child) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Qualified );
        newnode->type->qualified.parent = parent->type;
        newnode->type->qualified.child = child->type;
        parent->type = nullptr;
        child->type = nullptr;
        delete parent;
        delete child;
        return newnode;
}

DeclarationNode * DeclarationNode::newAggregate( Aggregate kind, const string * name, ExpressionNode * actuals, DeclarationNode * fields, bool body ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Aggregate );
        newnode->type->aggregate.kind = kind;
        newnode->type->aggregate.name =  name == nullptr ? new string( DeclarationNode::anonymous.newName() ) : name;
        newnode->type->aggregate.actuals = actuals;
        newnode->type->aggregate.fields = fields;
        newnode->type->aggregate.body = body;
        newnode->type->aggregate.tagged = false;
        newnode->type->aggregate.parent = nullptr;
        newnode->type->aggregate.anon = name == nullptr;
        return newnode;
} // DeclarationNode::newAggregate

DeclarationNode * DeclarationNode::newEnum( const string * name, DeclarationNode * constants, bool body ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Enum );
        newnode->type->enumeration.name = name == nullptr ? new string( DeclarationNode::anonymous.newName() ) : name;
        newnode->type->enumeration.constants = constants;
        newnode->type->enumeration.body = body;
        newnode->type->enumeration.anon = name == nullptr;
        return newnode;
} // DeclarationNode::newEnum

DeclarationNode * DeclarationNode::newEnumConstant( const string * name, ExpressionNode * constant ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->name = name;
        newnode->enumeratorValue.reset( constant );
        return newnode;
} // DeclarationNode::newEnumConstant

DeclarationNode * DeclarationNode::newName( const string * name ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->name = name;
        return newnode;
} // DeclarationNode::newName

DeclarationNode * DeclarationNode::newFromTypeGen( const string * name, ExpressionNode * params ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::SymbolicInst );
        newnode->type->symbolic.name = name;
        newnode->type->symbolic.isTypedef = false;
        newnode->type->symbolic.actuals = params;
        return newnode;
} // DeclarationNode::newFromTypeGen

DeclarationNode * DeclarationNode::newTypeParam( TypeClass tc, const string * name ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = nullptr;
        assert( ! newnode->name );
//      newnode->variable.name = name;
        newnode->name = name;
        newnode->variable.tyClass = tc;
        newnode->variable.assertions = nullptr;
        return newnode;
} // DeclarationNode::newTypeParam

DeclarationNode * DeclarationNode::newTrait( const string * name, DeclarationNode * params, DeclarationNode * asserts ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Aggregate );
        newnode->type->aggregate.name = name;
        newnode->type->aggregate.kind = Trait;
        newnode->type->aggregate.params = params;
        newnode->type->aggregate.fields = asserts;
        return newnode;
} // DeclarationNode::newTrait

DeclarationNode * DeclarationNode::newTraitUse( const string * name, ExpressionNode * params ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::AggregateInst );
        newnode->type->aggInst.aggregate = new TypeData( TypeData::Aggregate );
        newnode->type->aggInst.aggregate->aggregate.kind = Trait;
        newnode->type->aggInst.aggregate->aggregate.name = name;
        newnode->type->aggInst.params = params;
        return newnode;
} // DeclarationNode::newTraitUse

DeclarationNode * DeclarationNode::newTypeDecl( const string * name, DeclarationNode * typeParams ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->name = name;
        newnode->type = new TypeData( TypeData::Symbolic );
        newnode->type->symbolic.isTypedef = false;
        newnode->type->symbolic.params = typeParams;
        return newnode;
} // DeclarationNode::newTypeDecl

DeclarationNode * DeclarationNode::newPointer( DeclarationNode * qualifiers, OperKinds kind ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( kind == OperKinds::PointTo ? TypeData::Pointer : TypeData::Reference );
        if ( kind == OperKinds::And ) {
                // T && is parsed as 'And' operator rather than two references => add a second reference type
                TypeData * td = new TypeData( TypeData::Reference );
                td->base = newnode->type;
                newnode->type = td;
        }
        if ( qualifiers ) {
                return newnode->addQualifiers( qualifiers );
        } else {
                return newnode;
        } // if
} // DeclarationNode::newPointer

DeclarationNode * DeclarationNode::newArray( ExpressionNode * size, DeclarationNode * qualifiers, bool isStatic ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Array );
        newnode->type->array.dimension = size;
        newnode->type->array.isStatic = isStatic;
        if ( newnode->type->array.dimension == nullptr || newnode->type->array.dimension->isExpressionType<ConstantExpr * >() ) {
                newnode->type->array.isVarLen = false;
        } else {
                newnode->type->array.isVarLen = true;
        } // if
        return newnode->addQualifiers( qualifiers );
} // DeclarationNode::newArray

DeclarationNode * DeclarationNode::newVarArray( DeclarationNode * qualifiers ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Array );
        newnode->type->array.dimension = nullptr;
        newnode->type->array.isStatic = false;
        newnode->type->array.isVarLen = true;
        return newnode->addQualifiers( qualifiers );
}

DeclarationNode * DeclarationNode::newBitfield( ExpressionNode * size ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->bitfieldWidth = size;
        return newnode;
}

DeclarationNode * DeclarationNode::newTuple( DeclarationNode * members ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Tuple );
        newnode->type->tuple = members;
        return newnode;
}

DeclarationNode * DeclarationNode::newTypeof( ExpressionNode * expr, bool basetypeof ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( basetypeof ? TypeData::Basetypeof : TypeData::Typeof );
        newnode->type->typeexpr = expr;
        return newnode;
}

DeclarationNode * DeclarationNode::newBuiltinType( BuiltinType bt ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = new TypeData( TypeData::Builtin );
        newnode->builtin = bt;
        newnode->type->builtintype = newnode->builtin;
        return newnode;
} // DeclarationNode::newBuiltinType

DeclarationNode * DeclarationNode::newAttr( const string * name, ExpressionNode * expr ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = nullptr;
//      newnode->attr.name = name;
        newnode->name = name;
        newnode->attr.expr = expr;
        return newnode;
}

DeclarationNode * DeclarationNode::newAttr( const string * name, DeclarationNode * type ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = nullptr;
//      newnode->attr.name = name;
        newnode->name = name;
        newnode->attr.type = type;
        return newnode;
}

DeclarationNode * DeclarationNode::newAttribute( const string * name, ExpressionNode * expr ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = nullptr;
        std::list< Expression * > exprs;
        buildList( expr, exprs );
        newnode->attributes.push_back( new Attribute( *name, exprs ) );
        delete name;
        return newnode;
}

DeclarationNode * DeclarationNode::newAsmStmt( StatementNode * stmt ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->asmStmt = stmt;
        return newnode;
}

DeclarationNode * DeclarationNode::newStaticAssert( ExpressionNode * condition, Expression * message ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->assert.condition = condition;
        newnode->assert.message = message;
        return newnode;
}


void appendError( string & dst, const string & src ) {
        if ( src.empty() ) return;
        if ( dst.empty() ) { dst = src; return; }
        dst += ", " + src;
} // appendError

void DeclarationNode::checkQualifiers( const TypeData * src, const TypeData * dst ) {
        const Type::Qualifiers qsrc = src->qualifiers, qdst = dst->qualifiers; // optimization

        if ( (qsrc & qdst).any() ) {                                            // duplicates ?
                for ( unsigned int i = 0; i < Type::NumTypeQualifier; i += 1 ) { // find duplicates
                        if ( qsrc[i] && qdst[i] ) {
                                appendError( error, string( "duplicate " ) + Type::QualifiersNames[i] );
                        } // if
                } // for
        } // for
} // DeclarationNode::checkQualifiers

void DeclarationNode::checkSpecifiers( DeclarationNode * src ) {
        if ( (funcSpecs & src->funcSpecs).any() ) {                     // duplicates ?
                for ( unsigned int i = 0; i < Type::NumFuncSpecifier; i += 1 ) { // find duplicates
                        if ( funcSpecs[i] && src->funcSpecs[i] ) {
                                appendError( error, string( "duplicate " ) + Type::FuncSpecifiersNames[i] );
                        } // if
                } // for
        } // if

        if ( storageClasses.any() && src->storageClasses.any() ) { // any reason to check ?
                if ( (storageClasses & src->storageClasses ).any() ) { // duplicates ?
                        for ( unsigned int i = 0; i < Type::NumStorageClass; i += 1 ) { // find duplicates
                                if ( storageClasses[i] && src->storageClasses[i] ) {
                                        appendError( error, string( "duplicate " ) + Type::StorageClassesNames[i] );
                                } // if
                        } // for
                        // src is the new item being added and has a single bit
                } else if ( ! src->storageClasses.is_threadlocal ) { // conflict ?
                        appendError( error, string( "conflicting " ) + Type::StorageClassesNames[storageClasses.ffs()] +
                                                 " & " + Type::StorageClassesNames[src->storageClasses.ffs()] );
                        src->storageClasses.reset();                            // FIX to preserve invariant of one basic storage specifier
                } // if
        } // if

        appendError( error, src->error );
} // DeclarationNode::checkSpecifiers

DeclarationNode * DeclarationNode::copySpecifiers( DeclarationNode * q ) {
        funcSpecs |= q->funcSpecs;
        storageClasses |= q->storageClasses;

        for ( Attribute *attr: reverseIterate( q->attributes ) ) {
                attributes.push_front( attr->clone() );
        } // for
        return this;
} // DeclarationNode::copySpecifiers

static void addQualifiersToType( TypeData *& src, TypeData * dst ) {
        if ( dst->base ) {
                addQualifiersToType( src, dst->base );
        } else if ( dst->kind == TypeData::Function ) {
                dst->base = src;
                src = nullptr;
        } else {
                dst->qualifiers |= src->qualifiers;
        } // if
} // addQualifiersToType

DeclarationNode * DeclarationNode::addQualifiers( DeclarationNode * q ) {
        if ( ! q ) { return this; }                                                     // empty qualifier

        checkSpecifiers( q );
        copySpecifiers( q );

        if ( ! q->type ) { delete q; return this; }

        if ( ! type ) {
                type = q->type;                                                                 // reuse structure
                q->type = nullptr;
                delete q;
                return this;
        } // if

        if ( q->type->forall ) {                                                        // forall qualifier ?
                if ( type->forall ) {                                                   // polymorphic routine ?
                        type->forall->appendList( q->type->forall ); // augment forall qualifier
                } else {
                        if ( type->kind == TypeData::Aggregate ) {      // struct/union ?
                                if ( type->aggregate.params ) {                 // polymorphic ?
                                        type->aggregate.params->appendList( q->type->forall ); // augment forall qualifier
                                } else {                                                                // not polymorphic
                                        type->aggregate.params = q->type->forall; // set forall qualifier
                                } // if
                        } else {                                                                        // not polymorphic
                                type->forall = q->type->forall;                 // make polymorphic routine
                        } // if
                } // if
                q->type->forall = nullptr;                                              // forall qualifier moved
        } // if

        checkQualifiers( type, q->type );
        if ( (builtin == Zero || builtin == One) && q->type->qualifiers.val != 0 && error.length() == 0 ) {
                SemanticWarning( yylloc, Warning::BadQualifiersZeroOne, Type::QualifiersNames[ilog2( q->type->qualifiers.val )], builtinTypeNames[builtin] );
        } // if
        addQualifiersToType( q->type, type );

        delete q;
        return this;
} // addQualifiers

static void addTypeToType( TypeData *& src, TypeData *& dst ) {
        if ( src->forall && dst->kind == TypeData::Function ) {
                if ( dst->forall ) {
                        dst->forall->appendList( src->forall );
                } else {
                        dst->forall = src->forall;
                } // if
                src->forall = nullptr;
        } // if
        if ( dst->base ) {
                addTypeToType( src, dst->base );
        } else {
                switch ( dst->kind ) {
                  case TypeData::Unknown:
                        src->qualifiers |= dst->qualifiers;
                        dst = src;
                        src = nullptr;
                        break;
                  case TypeData::Basic:
                        dst->qualifiers |= src->qualifiers;
                        if ( src->kind != TypeData::Unknown ) {
                                assert( src->kind == TypeData::Basic );

                                if ( dst->basictype == DeclarationNode::NoBasicType ) {
                                        dst->basictype = src->basictype;
                                } else if ( src->basictype != DeclarationNode::NoBasicType )
                                        SemanticError( yylloc, src, string( "conflicting type specifier " ) + DeclarationNode::basicTypeNames[ src->basictype ] + " in type: " );

                                if ( dst->complextype == DeclarationNode::NoComplexType ) {
                                        dst->complextype = src->complextype;
                                } else if ( src->complextype != DeclarationNode::NoComplexType )
                                        SemanticError( yylloc, src, string( "conflicting type specifier " ) + DeclarationNode::complexTypeNames[ src->complextype ] + " in type: " );

                                if ( dst->signedness == DeclarationNode::NoSignedness ) {
                                        dst->signedness = src->signedness;
                                } else if ( src->signedness != DeclarationNode::NoSignedness )
                                        SemanticError( yylloc, src, string( "conflicting type specifier " ) + DeclarationNode::signednessNames[ src->signedness ] + " in type: " );

                                if ( dst->length == DeclarationNode::NoLength ) {
                                        dst->length = src->length;
                                } else if ( dst->length == DeclarationNode::Long && src->length == DeclarationNode::Long ) {
                                        dst->length = DeclarationNode::LongLong;
                                } else if ( src->length != DeclarationNode::NoLength )
                                        SemanticError( yylloc, src, string( "conflicting type specifier " ) + DeclarationNode::lengthNames[ src->length ] + " in type: " );
                        } // if
                        break;
                  default:
                        switch ( src->kind ) {
                          case TypeData::Aggregate:
                          case TypeData::Enum:
                                dst->base = new TypeData( TypeData::AggregateInst );
                                dst->base->aggInst.aggregate = src;
                                if ( src->kind == TypeData::Aggregate ) {
                                        dst->base->aggInst.params = maybeClone( src->aggregate.actuals );
                                } // if
                                dst->base->qualifiers |= src->qualifiers;
                                src = nullptr;
                                break;
                          default:
                                if ( dst->forall ) {
                                        dst->forall->appendList( src->forall );
                                } else {
                                        dst->forall = src->forall;
                                } // if
                                src->forall = nullptr;
                                dst->base = src;
                                src = nullptr;
                        } // switch
                } // switch
        } // if
}

DeclarationNode * DeclarationNode::addType( DeclarationNode * o ) {
        if ( o ) {
                checkSpecifiers( o );
                copySpecifiers( o );
                if ( o->type ) {
                        if ( ! type ) {
                                if ( o->type->kind == TypeData::Aggregate || o->type->kind == TypeData::Enum ) {
                                        type = new TypeData( TypeData::AggregateInst );
                                        type->aggInst.aggregate = o->type;
                                        if ( o->type->kind == TypeData::Aggregate ) {
                                                type->aggInst.hoistType = o->type->aggregate.body;
                                                type->aggInst.params = maybeClone( o->type->aggregate.actuals );
                                        } else {
                                                type->aggInst.hoistType = o->type->enumeration.body;
                                        } // if
                                        type->qualifiers |= o->type->qualifiers;
                                } else {
                                        type = o->type;
                                } // if
                                o->type = nullptr;
                        } else {
                                addTypeToType( o->type, type );
                        } // if
                } // if
                if ( o->bitfieldWidth ) {
                        bitfieldWidth = o->bitfieldWidth;
                } // if

                // there may be typedefs chained onto the type
                if ( o->get_next() ) {
                        set_last( o->get_next()->clone() );
                } // if
        } // if
        delete o;
        return this;
}

DeclarationNode * DeclarationNode::addTypedef() {
        TypeData * newtype = new TypeData( TypeData::Symbolic );
        newtype->symbolic.params = nullptr;
        newtype->symbolic.isTypedef = true;
        newtype->symbolic.name = name ? new string( *name ) : nullptr;
        newtype->base = type;
        type = newtype;
        return this;
}

DeclarationNode * DeclarationNode::addAssertions( DeclarationNode * assertions ) {
        if ( variable.tyClass != NoTypeClass ) {
                if ( variable.assertions ) {
                        variable.assertions->appendList( assertions );
                } else {
                        variable.assertions = assertions;
                } // if
                return this;
        } // if

        assert( type );
        switch ( type->kind ) {
          case TypeData::Symbolic:
                if ( type->symbolic.assertions ) {
                        type->symbolic.assertions->appendList( assertions );
                } else {
                        type->symbolic.assertions = assertions;
                } // if
                break;
          default:
                assert( false );
        } // switch

        return this;
}

DeclarationNode * DeclarationNode::addName( string * newname ) {
        assert( ! name );
        name = newname;
        return this;
}

DeclarationNode * DeclarationNode::addAsmName( DeclarationNode * newname ) {
        assert( ! asmName );
        asmName = newname ? newname->asmName : nullptr;
        return this->addQualifiers( newname );
}

DeclarationNode * DeclarationNode::addBitfield( ExpressionNode * size ) {
        bitfieldWidth = size;
        return this;
}

DeclarationNode * DeclarationNode::addVarArgs() {
        assert( type );
        hasEllipsis = true;
        return this;
}

DeclarationNode * DeclarationNode::addFunctionBody( StatementNode * body, ExpressionNode * withExprs ) {
        assert( type );
        assert( type->kind == TypeData::Function );
        assert( ! type->function.body );
        type->function.body = body;
        type->function.withExprs = withExprs;
        return this;
}

DeclarationNode * DeclarationNode::addOldDeclList( DeclarationNode * list ) {
        assert( type );
        assert( type->kind == TypeData::Function );
        assert( ! type->function.oldDeclList );
        type->function.oldDeclList = list;
        return this;
}

DeclarationNode * DeclarationNode::setBase( TypeData * newType ) {
        if ( type ) {
                TypeData * prevBase = type;
                TypeData * curBase = type->base;
                while ( curBase != nullptr ) {
                        prevBase = curBase;
                        curBase = curBase->base;
                } // while
                prevBase->base = newType;
        } else {
                type = newType;
        } // if
        return this;
}

DeclarationNode * DeclarationNode::copyAttribute( DeclarationNode * a ) {
        if ( a ) {
                for ( Attribute *attr: reverseIterate( a->attributes ) ) {
                        attributes.push_front( attr );
                } // for
                a->attributes.clear();
        } // if
        return this;
} // copyAttribute

DeclarationNode * DeclarationNode::addPointer( DeclarationNode * p ) {
        if ( p ) {
                assert( p->type->kind == TypeData::Pointer || p->type->kind == TypeData::Reference );
                setBase( p->type );
                p->type = nullptr;
                copyAttribute( p );
                delete p;
        } // if
        return this;
}

DeclarationNode * DeclarationNode::addArray( DeclarationNode * a ) {
        if ( a ) {
                assert( a->type->kind == TypeData::Array );
                setBase( a->type );
                a->type = nullptr;
                copyAttribute( a );
                delete a;
        } // if
        return this;
}

DeclarationNode * DeclarationNode::addNewPointer( DeclarationNode * p ) {
        if ( p ) {
                assert( p->type->kind == TypeData::Pointer || p->type->kind == TypeData::Reference );
                if ( type ) {
                        switch ( type->kind ) {
                          case TypeData::Aggregate:
                          case TypeData::Enum:
                                p->type->base = new TypeData( TypeData::AggregateInst );
                                p->type->base->aggInst.aggregate = type;
                                if ( type->kind == TypeData::Aggregate ) {
                                        p->type->base->aggInst.params = maybeClone( type->aggregate.actuals );
                                } // if
                                p->type->base->qualifiers |= type->qualifiers;
                                break;

                          default:
                                p->type->base = type;
                        } // switch
                        type = nullptr;
                } // if
                delete this;
                return p;
        } else {
                return this;
        } // if
}

static TypeData * findLast( TypeData * a ) {
        assert( a );
        TypeData * cur = a;
        while ( cur->base ) {
                cur = cur->base;
        } // while
        return cur;
}

DeclarationNode * DeclarationNode::addNewArray( DeclarationNode * a ) {
  if ( ! a ) return this;
        assert( a->type->kind == TypeData::Array );
        TypeData * lastArray = findLast( a->type );
        if ( type ) {
                switch ( type->kind ) {
                  case TypeData::Aggregate:
                  case TypeData::Enum:
                        lastArray->base = new TypeData( TypeData::AggregateInst );
                        lastArray->base->aggInst.aggregate = type;
                        if ( type->kind == TypeData::Aggregate ) {
                                lastArray->base->aggInst.params = maybeClone( type->aggregate.actuals );
                        } // if
                        lastArray->base->qualifiers |= type->qualifiers;
                        break;
                  default:
                        lastArray->base = type;
                } // switch
                type = nullptr;
        } // if
        delete this;
        return a;
}

DeclarationNode * DeclarationNode::addParamList( DeclarationNode * params ) {
        TypeData * ftype = new TypeData( TypeData::Function );
        ftype->function.params = params;
        setBase( ftype );
        return this;
}

static TypeData * addIdListToType( TypeData * type, DeclarationNode * ids ) {
        if ( type ) {
                if ( type->kind != TypeData::Function ) {
                        type->base = addIdListToType( type->base, ids );
                } else {
                        type->function.idList = ids;
                } // if
                return type;
        } else {
                TypeData * newtype = new TypeData( TypeData::Function );
                newtype->function.idList = ids;
                return newtype;
        } // if
} // addIdListToType

DeclarationNode * DeclarationNode::addIdList( DeclarationNode * ids ) {
        type = addIdListToType( type, ids );
        return this;
}

DeclarationNode * DeclarationNode::addInitializer( InitializerNode * init ) {
        initializer = init;
        return this;
}

DeclarationNode * DeclarationNode::addTypeInitializer( DeclarationNode * init ) {
        assertf( variable.tyClass != NoTypeClass, "Called addTypeInitializer on something that isn't a type variable." );
        variable.initializer = init;
        return this;
}

DeclarationNode * DeclarationNode::cloneType( string * newName ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = maybeClone( type );
        newnode->copySpecifiers( this );
        assert( newName );
        newnode->name = newName;
        return newnode;
}

DeclarationNode * DeclarationNode::cloneBaseType( DeclarationNode * o ) {
        if ( ! o ) return nullptr;

        o->copySpecifiers( this );
        if ( type ) {
                TypeData * srcType = type;

                // search for the base type by scanning off pointers and array designators
                while ( srcType->base ) {
                        srcType = srcType->base;
                } // while

                TypeData * newType = srcType->clone();
                if ( newType->kind == TypeData::AggregateInst ) {
                        // don't duplicate members
                        if ( newType->aggInst.aggregate->kind == TypeData::Enum ) {
                                delete newType->aggInst.aggregate->enumeration.constants;
                                newType->aggInst.aggregate->enumeration.constants = nullptr;
                                newType->aggInst.aggregate->enumeration.body = false;
                        } else {
                                assert( newType->aggInst.aggregate->kind == TypeData::Aggregate );
                                delete newType->aggInst.aggregate->aggregate.fields;
                                newType->aggInst.aggregate->aggregate.fields = nullptr;
                                newType->aggInst.aggregate->aggregate.body = false;
                        } // if
                        // don't hoist twice
                        newType->aggInst.hoistType = false;
                } // if

                newType->forall = maybeClone( type->forall );
                if ( ! o->type ) {
                        o->type = newType;
                } else {
                        addTypeToType( newType, o->type );
                        delete newType;
                } // if
        } // if
        return o;
}

DeclarationNode * DeclarationNode::extractAggregate() const {
        if ( type ) {
                TypeData * ret = typeextractAggregate( type );
                if ( ret ) {
                        DeclarationNode * newnode = new DeclarationNode;
                        newnode->type = ret;
                        return newnode;
                } // if
        } // if
        return nullptr;
}

void buildList( const DeclarationNode * firstNode, std::list< Declaration * > & outputList ) {
        SemanticErrorException errors;
        std::back_insert_iterator< std::list< Declaration * > > out( outputList );

        for ( const DeclarationNode * cur = firstNode; cur; cur = dynamic_cast< DeclarationNode * >( cur->get_next() ) ) {
                try {
                        bool extracted = false;
                        bool anon = false;
                        if ( DeclarationNode * extr = cur->extractAggregate() ) {
                                // handle the case where a structure declaration is contained within an object or type declaration
                                Declaration * decl = extr->build();
                                if ( decl ) {
                                        // hoist the structure declaration
                                        decl->location = cur->location;
                                        * out++ = decl;

                                        // need to remember the cases where a declaration contains an anonymous aggregate definition
                                        extracted = true;
                                        assert( extr->type );
                                        if ( extr->type->kind == TypeData::Aggregate ) {
                                                anon = extr->type->aggregate.anon;
                                        } else if ( extr->type->kind == TypeData::Enum ) {
                                                // xxx - is it useful to have an implicit anonymous enum member?
                                                anon = extr->type->enumeration.anon;
                                        }
                                } // if
                                delete extr;
                        } // if

                        Declaration * decl = cur->build();
                        if ( decl ) {
                                // don't include anonymous declaration for named aggregates, but do include them for anonymous aggregates, e.g.:
                                // struct S {
                                //   struct T { int x; }; // no anonymous member
                                //   struct { int y; };   // anonymous member
                                //   struct T;            // anonymous member
                                // };
                                if ( ! (extracted && decl->name == "" && ! anon && ! cur->get_inLine()) ) {
                                        if ( decl->name == "" ) {
                                                if ( DeclarationWithType * dwt = dynamic_cast<DeclarationWithType *>( decl ) ) {
                                                        if ( ReferenceToType * aggr = dynamic_cast<ReferenceToType *>( dwt->get_type() ) ) {
                                                                if ( aggr->name.find("anonymous") == std::string::npos ) {
                                                                        if ( ! cur->get_inLine() ) {
                                                                                // temporary: warn about anonymous member declarations of named types, since
                                                                                // this conflicts with the syntax for the forward declaration of an anonymous type
                                                                                SemanticWarning( cur->location, Warning::AggrForwardDecl, aggr->name.c_str() );
                                                                        } // if
                                                                } // if
                                                        } // if
                                                } // if
                                        } // if
                                        decl->location = cur->location;
                                        *out++ = decl;
                                } // if
                        } // if
                } catch( SemanticErrorException & e ) {
                        errors.append( e );
                } // try
        } // for

        if ( ! errors.isEmpty() ) {
                throw errors;
        } // if
} // buildList

// currently only builds assertions, function parameters, and return values
void buildList( const DeclarationNode * firstNode, std::list< DeclarationWithType * > & outputList ) {
        SemanticErrorException errors;
        std::back_insert_iterator< std::list< DeclarationWithType * > > out( outputList );

        for ( const DeclarationNode * cur = firstNode; cur; cur = dynamic_cast< DeclarationNode * >( cur->get_next() ) ) {
                try {
                        Declaration * decl = cur->build();
                        assert( decl );
                        if ( DeclarationWithType * dwt = dynamic_cast< DeclarationWithType * >( decl ) ) {
                                dwt->location = cur->location;
                                * out++ = dwt;
                        } else if ( StructDecl * agg = dynamic_cast< StructDecl * >( decl ) ) {
                                // e.g., int foo(struct S) {}
                                StructInstType * inst = new StructInstType( Type::Qualifiers(), agg->name );
                                auto obj = new ObjectDecl( "", Type::StorageClasses(), linkage, nullptr, inst, nullptr );
                                obj->location = cur->location;
                                * out++ = obj;
                                delete agg;
                        } else if ( UnionDecl * agg = dynamic_cast< UnionDecl * >( decl ) ) {
                                // e.g., int foo(union U) {}
                                UnionInstType * inst = new UnionInstType( Type::Qualifiers(), agg->name );
                                auto obj = new ObjectDecl( "", Type::StorageClasses(), linkage, nullptr, inst, nullptr );
                                obj->location = cur->location;
                                * out++ = obj;
                        } else if ( EnumDecl * agg = dynamic_cast< EnumDecl * >( decl ) ) {
                                // e.g., int foo(enum E) {}
                                EnumInstType * inst = new EnumInstType( Type::Qualifiers(), agg->name );
                                auto obj = new ObjectDecl( "", Type::StorageClasses(), linkage, nullptr, inst, nullptr );
                                obj->location = cur->location;
                                * out++ = obj;
                        } // if
                } catch( SemanticErrorException & e ) {
                        errors.append( e );
                } // try
        } // for

        if ( ! errors.isEmpty() ) {
                throw errors;
        } // if
} // buildList

void buildTypeList( const DeclarationNode * firstNode, std::list< Type * > & outputList ) {
        SemanticErrorException errors;
        std::back_insert_iterator< std::list< Type * > > out( outputList );
        const DeclarationNode * cur = firstNode;

        while ( cur ) {
                try {
                        * out++ = cur->buildType();
                } catch( SemanticErrorException & e ) {
                        errors.append( e );
                } // try
                cur = dynamic_cast< DeclarationNode * >( cur->get_next() );
        } // while

        if ( ! errors.isEmpty() ) {
                throw errors;
        } // if
} // buildTypeList

Declaration * DeclarationNode::build() const {
        if ( ! error.empty() ) SemanticError( this, error + " in declaration of " );

        if ( asmStmt ) {
                return new AsmDecl( strict_dynamic_cast<AsmStmt *>( asmStmt->build() ) );
        } // if

        if ( variable.tyClass != NoTypeClass ) {
                // otype is internally converted to dtype + otype parameters
                static const TypeDecl::Kind kindMap[] = { TypeDecl::Dtype, TypeDecl::Dtype, TypeDecl::Ftype, TypeDecl::Ttype };
                assertf( sizeof(kindMap)/sizeof(kindMap[0]) == NoTypeClass, "DeclarationNode::build: kindMap is out of sync." );
                assertf( variable.tyClass < sizeof(kindMap)/sizeof(kindMap[0]), "Variable's tyClass is out of bounds." );
                TypeDecl * ret = new TypeDecl( *name, Type::StorageClasses(), nullptr, kindMap[ variable.tyClass ], variable.tyClass == Otype, variable.initializer ? variable.initializer->buildType() : nullptr );
                buildList( variable.assertions, ret->get_assertions() );
                return ret;
        } // if

        if ( type ) {
                // Function specifiers can only appear on a function definition/declaration.
                //
                //    inline _Noreturn int f();                 // allowed
                //    inline _Noreturn int g( int i );  // allowed
                //    inline _Noreturn int i;                   // disallowed
                if ( type->kind != TypeData::Function && funcSpecs.any() ) {
                        SemanticError( this, "invalid function specifier for " );
                } // if
                // Forall qualifier can only appear on a function/aggregate definition/declaration.
                //
                //    forall int f();                                   // allowed
                //    forall int g( int i );                    // allowed
                //    forall int i;                                             // disallowed
                if ( type->kind != TypeData::Function && type->forall ) {
                        SemanticError( this, "invalid type qualifier for " );
                } // if
                bool isDelete = initializer && initializer->get_isDelete();
                Declaration * decl = buildDecl( type, name ? *name : string( "" ), storageClasses, maybeBuild< Expression >( bitfieldWidth ), funcSpecs, linkage, asmName, isDelete ? nullptr : maybeBuild< Initializer >(initializer), attributes )->set_extension( extension );
                if ( isDelete ) {
                        DeclarationWithType * dwt = strict_dynamic_cast<DeclarationWithType *>( decl );
                        dwt->isDeleted = true;
                }
                return decl;
        } // if

        if ( assert.condition ) {
                return new StaticAssertDecl( maybeBuild< Expression >( assert.condition ), strict_dynamic_cast< ConstantExpr * >( maybeClone( assert.message ) ) );
        }

        // SUE's cannot have function specifiers, either
        //
        //    inlne _Noreturn struct S { ... };         // disallowed
        //    inlne _Noreturn enum   E { ... };         // disallowed
        if ( funcSpecs.any() ) {
                SemanticError( this, "invalid function specifier for " );
        } // if
        assertf( name, "ObjectDecl must a have name\n" );
        return (new ObjectDecl( *name, storageClasses, linkage, maybeBuild< Expression >( bitfieldWidth ), nullptr, maybeBuild< Initializer >( initializer ) ))->set_asmName( asmName )->set_extension( extension );
}

Type * DeclarationNode::buildType() const {
        assert( type );

        if ( attr.expr ) {
                return new AttrType( buildQualifiers( type ), *name, attr.expr->build(), attributes );
        } else if ( attr.type ) {
                return new AttrType( buildQualifiers( type ), *name, attr.type->buildType(), attributes );
        } // if

        switch ( type->kind ) {
          case TypeData::Enum:
          case TypeData::Aggregate: {
                  ReferenceToType * ret = buildComAggInst( type, attributes, linkage );
                  buildList( type->aggregate.actuals, ret->get_parameters() );
                  return ret;
          }
          case TypeData::Symbolic: {
                  TypeInstType * ret = new TypeInstType( buildQualifiers( type ), *type->symbolic.name, false, attributes );
                  buildList( type->symbolic.actuals, ret->get_parameters() );
                  return ret;
          }
          default:
                Type * simpletypes = typebuild( type );
                simpletypes->get_attributes() = attributes;             // copy because member is const
                return simpletypes;
        } // switch
}

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //