source: src/Parser/DeclarationNode.cpp @ 960665c

//
// 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.cpp --
//
// Author           : Rodolfo G. Esteves
// Created On       : Sat May 16 12:34:05 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Feb 23 18:25:57 2024
// Update Count     : 1533
//

#include "DeclarationNode.hpp"

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

#include "AST/Attribute.hpp"           // for Attribute
#include "AST/Copy.hpp"                // for shallowCopy
#include "AST/Decl.hpp"                // for Decl
#include "AST/Expr.hpp"                // for Expr
#include "AST/Print.hpp"               // for print
#include "AST/Stmt.hpp"                // for AsmStmt, DirectiveStmt
#include "AST/StorageClasses.hpp"      // for Storage::Class
#include "AST/Type.hpp"                // for Type
#include "Common/CodeLocation.hpp"     // for CodeLocation
#include "Common/Iterate.hpp"          // for reverseIterate
#include "Common/SemanticError.hpp"    // for SemanticError
#include "Common/UniqueName.hpp"       // for UniqueName
#include "Common/Utility.hpp"          // for copy, spliceBegin
#include "Parser/ExpressionNode.hpp"   // for ExpressionNode
#include "Parser/InitializerNode.hpp"  // for InitializerNode
#include "Parser/StatementNode.hpp"    // for StatementNode
#include "TypeData.hpp"                // for TypeData, TypeData::Aggregate_t
#include "TypedefTable.hpp"            // for TypedefTable

extern TypedefTable typedefTable;

using namespace std;

UniqueName DeclarationNode::anonymous( "__anonymous" );

extern ast::Linkage::Spec linkage;                                              // defined in parser.yy

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

        variable.tyClass = ast::TypeDecl::NUMBER_OF_KINDS;
        variable.assertions = nullptr;
        variable.initializer = nullptr;

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

DeclarationNode::~DeclarationNode() {
        delete 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->next = maybeCopy( next );
        newnode->name = name ? new string( *name ) : nullptr;

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

        newnode->variable.tyClass = variable.tyClass;
        newnode->variable.assertions = maybeCopy( variable.assertions );
        newnode->variable.initializer = maybeCopy( variable.initializer );

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

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

        if ( linkage != ast::Linkage::Cforall ) {
                os << ast::Linkage::name( linkage ) << " ";
        } // if

        ast::print( os, storageClasses );
        ast::print( os, funcSpecs );

        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

        if ( ! attributes.empty() ) {
                os << string( indent + 2, ' ' ) << "with attributes" << endl;
                for ( ast::ptr<ast::Attribute> const & attr : reverseIterate( attributes ) ) {
                        os << string( indent + 4, ' ' );
                        ast::print( os, attr, indent + 2 );
                } // for
        } // if

        os << endl;
}

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

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

DeclarationNode * DeclarationNode::newStorageClass( ast::Storage::Classes sc ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->storageClasses = sc;
        return newnode;
} // DeclarationNode::newStorageClass

DeclarationNode * DeclarationNode::newFuncSpecifier( ast::Function::Specs fs ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->funcSpecs = fs;
        return newnode;
} // DeclarationNode::newFuncSpecifier

DeclarationNode * DeclarationNode::newAggregate( ast::AggregateDecl::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.anon = name == nullptr;
        newnode->type->aggregate.name = newnode->type->aggregate.anon ? new string( DeclarationNode::anonymous.newName() ) : name;
        newnode->type->aggregate.actuals = actuals;
        newnode->type->aggregate.fields = fields;
        newnode->type->aggregate.body = body;
        return newnode;
} // DeclarationNode::newAggregate

DeclarationNode * DeclarationNode::newEnum( const string * name, DeclarationNode * constants, bool body, bool isCfa, DeclarationNode * base, EnumHiding hiding ) {
        DeclarationNode * newnode = newAggregate( ast::AggregateDecl::Enum, name, nullptr, constants, body );
        newnode->type->aggregate.isCfa = isCfa;
        newnode->type->aggregate.hiding = hiding;
        if ( base ) {
                assert( isCfa );
                assert( base->type );
                newnode->type->base = base->type;
                base->type = nullptr;
                delete base;
        } // if

        return newnode;
} // DeclarationNode::newEnum

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

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

DeclarationNode * DeclarationNode::newEnumValueGeneric( const string * name, InitializerNode * init ) {
        if ( nullptr == init ) {
                return newName( name );
        } else if ( init->get_expression() ) {
                return newEnumConstant( name, init->get_expression() );
        } else {
                DeclarationNode * newnode = newName( name );
                newnode->initializer = init;
                return newnode;
        } // if
} // DeclarationNode::newEnumValueGeneric

DeclarationNode * DeclarationNode::newEnumInLine( const std::string * name ) {
        DeclarationNode * newnode = newName( name );
        newnode->enumInLine = true;
        return newnode;
}

DeclarationNode * DeclarationNode::newTypeParam( ast::TypeDecl::Kind tc, const string * name ) {
        DeclarationNode * newnode = newName( name );
        newnode->type = nullptr;
        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 = ast::AggregateDecl::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 = ast::AggregateDecl::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 = newName( 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;
        newnode->type->array.isVarLen = size && !size->isExpressionType<ast::ConstantExpr *>();
        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::newFunction( const string * name, DeclarationNode * ret, DeclarationNode * param, StatementNode * body ) {
        DeclarationNode * newnode = newName( 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::newAttribute( const string * name, ExpressionNode * expr ) {
        DeclarationNode * newnode = new DeclarationNode;
        newnode->type = nullptr;
        std::vector<ast::ptr<ast::Expr>> exprs;
        buildList( expr, exprs );
        newnode->attributes.push_back( new ast::Attribute( *name, std::move( exprs ) ) );
        delete name;
        return newnode;
}

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

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

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

static 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 ast::CV::Qualifiers qsrc = src->qualifiers, qdst = dst->qualifiers; // optimization
        const ast::CV::Qualifiers duplicates = qsrc & qdst;

        if ( duplicates.any() ) {
                std::stringstream str;
                str << "duplicate ";
                ast::print( str, duplicates );
                str << "qualifier(s)";
                appendError( error, str.str() );
        } // for
} // DeclarationNode::checkQualifiers

void DeclarationNode::checkSpecifiers( DeclarationNode * src ) {
        ast::Function::Specs fsDups = funcSpecs & src->funcSpecs;
        if ( fsDups.any() ) {
                std::stringstream str;
                str << "duplicate ";
                ast::print( str, fsDups );
                str << "function specifier(s)";
                appendError( error, str.str() );
        } // if

        // Skip if everything is unset.
        if ( storageClasses.any() && src->storageClasses.any() ) {
                ast::Storage::Classes dups = storageClasses & src->storageClasses;
                // Check for duplicates.
                if ( dups.any() ) {
                        std::stringstream str;
                        str << "duplicate ";
                        ast::print( str, dups );
                        str << "storage class(es)";
                        appendError( error, str.str() );
                // Check for conflicts.
                } else if ( !src->storageClasses.is_threadlocal_any() ) {
                        std::stringstream str;
                        str << "conflicting ";
                        ast::print( str, ast::Storage::Classes( 1 << storageClasses.ffs() ) );
                        str << "& ";
                        ast::print( str, ast::Storage::Classes( 1 << src->storageClasses.ffs() ) );
                        str << "storage classes";
                        appendError( error, str.str() );
                        // FIX to preserve invariant of one basic storage specifier
                        src->storageClasses.reset();
                }
        } // if

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

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

        if ( copyattr ) {
                std::vector<ast::ptr<ast::Attribute>> tmp;
                tmp.reserve( q->attributes.size() );
                for ( auto const & attr : q->attributes ) {
                        tmp.emplace_back( ast::shallowCopy( attr.get() ) );
                } // for
                spliceBegin( attributes, tmp );
        } // if

        return this;
} // DeclarationNode::copySpecifiers

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

        checkQualifiers( type, q->type );
        TypeData::BuiltinType const builtin = type->builtintype;
        if ( (builtin == TypeData::Zero || builtin == TypeData::One) && q->type->qualifiers.any() && error.length() == 0 ) {
                SemanticWarning( yylloc, Warning::BadQualifiersZeroOne, TypeData::builtinTypeNames[builtin] );
        } // if
        type = ::addQualifiers( type, q->type );
        q->type = nullptr;

        delete q;
        return this;
} // addQualifiers

DeclarationNode * DeclarationNode::addType( DeclarationNode * o, bool copyattr ) {
        if ( !o ) return this;

        checkSpecifiers( o );
        copySpecifiers( o, copyattr );
        if ( o->type ) {
                type = ::addType( type, o->type, o->attributes );
                o->type = nullptr;
        } // if
        if ( o->bitfieldWidth ) {
                bitfieldWidth = o->bitfieldWidth;
        } // if

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

        delete o;
        return this;
}

DeclarationNode * DeclarationNode::addEnumBase( DeclarationNode * o ) {
        if ( o && o->type ) {
                type->base = o->type;
        } // if
        delete o;
        return this;
}

// This code handles a special issue with the attribute transparent_union.
//
//    typedef union U { int i; } typedef_name __attribute__(( aligned(16) )) __attribute__(( transparent_union ))
//
// Here the attribute aligned goes with the typedef_name, so variables declared of this type are
// aligned.  However, the attribute transparent_union must be moved from the typedef_name to
// alias union U.  Currently, this is the only know attribute that must be moved from typedef to
// alias.
static void moveUnionAttribute( DeclarationNode * decl, DeclarationNode * unionDecl ) {
        assert( decl->type->kind == TypeData::Symbolic );
        assert( decl->type->symbolic.isTypedef );
        assert( unionDecl->type->kind == TypeData::Aggregate );

        if ( unionDecl->type->aggregate.kind != ast::AggregateDecl::Union ) return;

        // Ignore the Aggregate_t::attributes. Why did we add that before the rework?
        for ( auto attr = decl->attributes.begin() ; attr != decl->attributes.end() ; ) {
                if ( (*attr)->name == "transparent_union" || (*attr)->name == "__transparent_union__" ) {
                        unionDecl->attributes.emplace_back( attr->release() );
                        attr = decl->attributes.erase( attr );
                } else {
                        ++attr;
                }
        }
}

// Helper for addTypedef, handles the case where the typedef wraps an
// aggregate declaration (not a type), returns a chain of nodes.
static DeclarationNode * addTypedefAggr(
                DeclarationNode * olddecl, TypeData * newtype ) {
        TypeData *& oldaggr = olddecl->type->aggInst.aggregate;

        // Handle anonymous aggregates: typedef struct { int i; } foo
        // Give the typedefed type a consistent name across translation units.
        if ( oldaggr->aggregate.anon ) {
                delete oldaggr->aggregate.name;
                oldaggr->aggregate.name = new string( "__anonymous_" + *olddecl->name );
                oldaggr->aggregate.anon = false;
                oldaggr->qualifiers.reset();
        }

        // Replace the wrapped TypeData with a forward declaration.
        TypeData * newaggr = new TypeData( TypeData::Aggregate );
        newaggr->aggregate.kind = oldaggr->aggregate.kind;
        newaggr->aggregate.name = oldaggr->aggregate.name ? new string( *oldaggr->aggregate.name ) : nullptr;
        newaggr->aggregate.body = false;
        newaggr->aggregate.anon = oldaggr->aggregate.anon;
        newaggr->aggregate.isCfa = oldaggr->aggregate.isCfa;
        newaggr->aggregate.hiding = oldaggr->aggregate.hiding;
        swap( newaggr, oldaggr );

        newtype->base = olddecl->type;
        olddecl->type = newtype;
        DeclarationNode * newdecl = new DeclarationNode;
        newdecl->type = newaggr;
        newdecl->next = olddecl;

        moveUnionAttribute( olddecl, newdecl );

        return newdecl;
}

// Wrap the declaration in a typedef. It actually does that by modifying the
// existing declaration, and may split it into two declarations.
// This only happens if the wrapped type is actually a declaration of a SUE
// type. If it does, the DeclarationNode for the SUE declaration is the node
// returned, make sure later transformations are applied to the right node.
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;
        // If this typedef is wrapping an aggregate, separate them out.
        if ( TypeData::AggregateInst == type->kind
                        && TypeData::Aggregate == type->aggInst.aggregate->kind
                        && type->aggInst.aggregate->aggregate.body ) {
                return addTypedefAggr( this, newtype );
        // There is no internal declaration, just a type.
        } else {
                newtype->base = type;
                type = newtype;
                return this;
        }
}

DeclarationNode * DeclarationNode::addAssertions( DeclarationNode * assertions ) {
        if ( variable.tyClass != ast::TypeDecl::NUMBER_OF_KINDS ) {
                extend( variable.assertions, assertions );
                return this;
        } // if

        assert( type );
        assert( TypeData::Symbolic == type->kind );
        extend( type->symbolic.assertions, assertions );

        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 ) {
                type->setLastBase( newType );
        } else {
                type = newType;
        } // if
        return this;
}

DeclarationNode * DeclarationNode::copyAttribute( DeclarationNode * a ) {
        if ( a ) {
                spliceBegin( attributes, a->attributes );
                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 ) return this;
        assert( p->type->kind == TypeData::Pointer || p->type->kind == TypeData::Reference );
        if ( type ) {
                p->type->base = makeNewBase( type );
                type = nullptr;
        } // if
        delete this;
        return p;
}

DeclarationNode * DeclarationNode::addNewArray( DeclarationNode * a ) {
        if ( !a ) return this;
        assert( a->type->kind == TypeData::Array );
        if ( type ) {
                a->type->setLastBase( makeNewBase( type ) );
                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 != ast::TypeDecl::NUMBER_OF_KINDS, "Called addTypeInitializer on something that isn't a type variable." );
        variable.initializer = init;
        return this;
}

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

DeclarationNode * DeclarationNode::cloneBaseType( DeclarationNode * o, bool copyattr ) {
        if ( ! o ) return nullptr;
        o->copySpecifiers( this, copyattr );
        if ( type ) {
                o->type = ::cloneBaseType( type, o->type );
        } // if
        return o;
}

DeclarationNode * DeclarationNode::extractAggregate() const {
        if ( type ) {
                TypeData * ret = typeextractAggregate( type );
                if ( ret ) {
                        DeclarationNode * newnode = new DeclarationNode;
                        newnode->type = ret;
                        if ( ret->kind == TypeData::Aggregate ) {
                                newnode->attributes.swap( ret->aggregate.attributes );
                        } // if
                        return newnode;
                } // if
        } // if
        return nullptr;
}

// Get the non-anonymous name of the instance type of the declaration,
// if one exists.
static const std::string * getInstTypeOfName( ast::Decl * decl ) {
        if ( auto dwt = dynamic_cast<ast::DeclWithType *>( decl ) ) {
                if ( auto aggr = dynamic_cast<ast::BaseInstType const *>( dwt->get_type() ) ) {
                        if ( aggr->name.find("anonymous") == std::string::npos ) {
                                return &aggr->name;
                        }
                }
        }
        return nullptr;
}

void buildList( DeclarationNode * firstNode, std::vector<ast::ptr<ast::Decl>> & outputList ) {
        SemanticErrorException errors;
        std::back_insert_iterator<std::vector<ast::ptr<ast::Decl>>> out( outputList );

        for ( const DeclarationNode * cur = firstNode ; cur ; cur = cur->next ) {
                try {
                        bool extracted_named = false;

                        if ( DeclarationNode * extr = cur->extractAggregate() ) {
                                assert( cur->type );

                                if ( ast::Decl * decl = extr->build() ) {
                                        *out++ = decl;

                                        // need to remember the cases where a declaration contains an anonymous aggregate definition
                                        assert( extr->type );
                                        if ( extr->type->kind == TypeData::Aggregate ) {
                                                // typedef struct { int A } B is the only case?
                                                extracted_named = ! extr->type->aggregate.anon;
                                        } else {
                                                extracted_named = true;
                                        }
                                } // if
                                delete extr;
                        } // if

                        if ( ast::Decl * decl = cur->build() ) {
                                if ( "" == decl->name && !cur->get_inLine() ) {
                                        // 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_named ) {
                                                continue;
                                        }

                                        if ( auto name = getInstTypeOfName( decl ) ) {
                                                // 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, name->c_str() );
                                        }
                                } // if
                                *out++ = decl;
                        } // 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( DeclarationNode * firstNode, std::vector<ast::ptr<ast::DeclWithType>> & outputList ) {
        SemanticErrorException errors;
        std::back_insert_iterator<std::vector<ast::ptr<ast::DeclWithType>>> out( outputList );

        for ( const DeclarationNode * cur = firstNode; cur; cur = cur->next ) {
                try {
                        ast::Decl * decl = cur->build();
                        assertf( decl, "buildList: build for ast::DeclWithType." );
                        if ( ast::DeclWithType * dwt = dynamic_cast<ast::DeclWithType *>( decl ) ) {
                                dwt->location = cur->location;
                                *out++ = dwt;
                        } else if ( ast::StructDecl * agg = dynamic_cast<ast::StructDecl *>( decl ) ) {
                                // e.g., int foo(struct S) {}
                                auto inst = new ast::StructInstType( agg->name );
                                auto obj = new ast::ObjectDecl( cur->location, "", inst );
                                obj->linkage = linkage;
                                *out++ = obj;
                                delete agg;
                        } else if ( ast::UnionDecl * agg = dynamic_cast<ast::UnionDecl *>( decl ) ) {
                                // e.g., int foo(union U) {}
                                auto inst = new ast::UnionInstType( agg->name );
                                auto obj = new ast::ObjectDecl( cur->location,
                                        "", inst, nullptr, ast::Storage::Classes(),
                                        linkage );
                                *out++ = obj;
                        } else if ( ast::EnumDecl * agg = dynamic_cast<ast::EnumDecl *>( decl ) ) {
                                // e.g., int foo(enum E) {}
                                auto inst = new ast::EnumInstType( agg->name );
                                auto obj = new ast::ObjectDecl( cur->location,
                                        "",
                                        inst,
                                        nullptr,
                                        ast::Storage::Classes(),
                                        linkage
                                );
                                *out++ = obj;
                        } else {
                                assertf( false, "buildList: Could not convert to ast::DeclWithType." );
                        } // if
                } catch ( SemanticErrorException & e ) {
                        errors.append( e );
                } // try
        } // for

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

void buildTypeList( const DeclarationNode * firstNode,
                std::vector<ast::ptr<ast::Type>> & outputList ) {
        SemanticErrorException errors;
        std::back_insert_iterator<std::vector<ast::ptr<ast::Type>>> out( outputList );

        for ( const DeclarationNode * cur = firstNode ; cur ; cur = cur->next ) {
                try {
                        * out++ = cur->buildType();
                } catch ( SemanticErrorException & e ) {
                        errors.append( e );
                } // try
        } // for

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

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

        if ( asmStmt ) {
                auto stmt = strict_dynamic_cast<ast::AsmStmt *>( asmStmt->build() );
                return new ast::AsmDecl( stmt->location, stmt );
        } // if
        if ( directiveStmt ) {
                auto stmt = strict_dynamic_cast<ast::DirectiveStmt *>( directiveStmt->build() );
                return new ast::DirectiveDecl( stmt->location, stmt );
        } // if

        if ( variable.tyClass != ast::TypeDecl::NUMBER_OF_KINDS ) {
                // otype is internally converted to dtype + otype parameters
                static const ast::TypeDecl::Kind kindMap[] = { ast::TypeDecl::Dtype, ast::TypeDecl::Dtype, ast::TypeDecl::Dtype, ast::TypeDecl::Ftype, ast::TypeDecl::Ttype, ast::TypeDecl::Dimension };
                static_assert( sizeof(kindMap) / sizeof(kindMap[0]) == ast::TypeDecl::NUMBER_OF_KINDS, "DeclarationNode::build: kindMap is out of sync." );
                assertf( variable.tyClass < sizeof(kindMap)/sizeof(kindMap[0]), "Variable's tyClass is out of bounds." );
                ast::TypeDecl * ret = new ast::TypeDecl( location,
                        *name,
                        ast::Storage::Classes(),
                        (ast::Type *)nullptr,
                        kindMap[ variable.tyClass ],
                        variable.tyClass == ast::TypeDecl::Otype || variable.tyClass == ast::TypeDecl::DStype,
                        variable.initializer ? variable.initializer->buildType() : nullptr
                );
                buildList( variable.assertions, ret->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();
                ast::Decl * decl = buildDecl(
                        type,
                        name ? *name : string( "" ),
                        storageClasses,
                        maybeBuild( bitfieldWidth ),
                        funcSpecs,
                        linkage,
                        asmName,
                        isDelete ? nullptr : maybeBuild( initializer ),
                        copy( attributes )
                )->set_extension( extension );
                if ( isDelete ) {
                        auto dwt = strict_dynamic_cast<ast::DeclWithType *>( decl );
                        dwt->isDeleted = true;
                }
                return decl;
        } // if

        if ( assert.condition ) {
                auto cond = maybeBuild( assert.condition );
                auto msg = strict_dynamic_cast<ast::ConstantExpr *>( maybeCopy( assert.message ) );
                return new ast::StaticAssertDecl( location, cond, msg );
        }

        // SUE's cannot have function specifiers, either
        //
        //    inline _Noreturn struct S { ... };                // disallowed
        //    inline _Noreturn enum   E { ... };                // disallowed
        if ( funcSpecs.any() ) {
                SemanticError( this, "invalid function specifier for " );
        } // if
        if ( enumInLine ) {
                return new ast::InlineMemberDecl( location,
                        *name, (ast::Type*)nullptr, storageClasses, linkage );
        } // if
        assertf( name, "ObjectDecl must a have name\n" );
        auto ret = new ast::ObjectDecl( location,
                *name,
                (ast::Type*)nullptr,
                maybeBuild( initializer ),
                storageClasses,
                linkage,
                maybeBuild( bitfieldWidth )
        );
        ret->asmName = asmName;
        ret->extension = extension;
        return ret;
}

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

        // Some types are parsed as declarations and, syntactically, can have
        // initializers. However, semantically, this is meaningless.
        if ( initializer ) {
                SemanticError( this, "Initializer on type declaration " );
        }

        switch ( type->kind ) {
        case TypeData::Aggregate: {
                ast::BaseInstType * ret =
                        buildComAggInst( type, copy( attributes ), linkage );
                buildList( type->aggregate.actuals, ret->params );
                return ret;
        }
        case TypeData::Symbolic: {
                ast::TypeInstType * ret = new ast::TypeInstType(
                        *type->symbolic.name,
                        // This is just a default, the true value is not known yet.
                        ast::TypeDecl::Dtype,
                        buildQualifiers( type ),
                        copy( attributes ) );
                buildList( type->symbolic.actuals, ret->params );
                return ret;
        }
        default:
                ast::Type * simpletypes = typebuild( type );
                // copy because member is const
                simpletypes->attributes = attributes;
                return simpletypes;
        } // switch
}

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