source: src/ResolvExpr/ResolveTypeof.cpp @ 81e768d

//
// 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.
//
// ResolveTypeof.cpp --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 12:12:20 2015
// Last Modified By : Andrew Beach
// Last Modified On : Wed Mar 16 16:09:00 2022
// Update Count     : 4
//

#include "ResolveTypeof.hpp"

#include <cassert>                  // for assert

#include "AST/CVQualifiers.hpp"
#include "AST/Node.hpp"
#include "AST/Pass.hpp"
#include "AST/TranslationUnit.hpp"
#include "AST/Type.hpp"
#include "AST/TypeEnvironment.hpp"
#include "Common/Utility.hpp"       // for copy
#include "InitTweak/InitTweak.hpp"  // for isConstExpr
#include "RenameVars.hpp"
#include "Resolver.hpp"             // for resolveInVoidContext
#include "SymTab/Mangler.hpp"

namespace ResolvExpr {

namespace {

struct ResolveTypeof : public ast::WithShortCircuiting {
        const ResolveContext & context;

        ResolveTypeof( const ResolveContext & context ) : context( context ) {}

        void previsit( const ast::TypeofType * ) { visit_children = false; }

        const ast::Type * postvisit( const ast::TypeofType * typeofType ) {
                // pass on null expression
                if ( ! typeofType->expr ) return typeofType;

                ast::ptr< ast::Type > newType;
                if ( auto tyExpr = typeofType->expr.as< ast::TypeExpr >() ) {
                        // typeof wrapping type
                        newType = tyExpr->type;
                } else {
                        // typeof wrapping expression
                        ast::TypeEnvironment dummy;
                        ast::ptr< ast::Expr > newExpr =
                                resolveInVoidContext( typeofType->expr, context, dummy );
                        assert( newExpr->result && ! newExpr->result->isVoid() );
                        newType = newExpr->result;
                }

                // clear qualifiers for base, combine with typeoftype quals regardless
                if ( typeofType->kind == ast::TypeofType::Basetypeof ) {
                        // replace basetypeof(<enum>) by int
                        auto enumInst = newType.as< ast::EnumInstType >();
                        if ( enumInst && (!enumInst->base || !enumInst->base->isCfa) ) {
                                newType = new ast::BasicType(
                                        ast::BasicKind::SignedInt, newType->qualifiers, copy(newType->attributes) );
                        }
                        reset_qualifiers(
                                newType,
                                ( newType->qualifiers & ~ast::CV::EquivQualifiers ) | typeofType->qualifiers );
                } else {
                        add_qualifiers( newType, typeofType->qualifiers );
                }

                return newType.release();
        }
};

} // anonymous namespace

const ast::Type * resolveTypeof( const ast::Type * type , const ResolveContext & context ) {
        ast::Pass< ResolveTypeof > mutator( context );
        return type->accept( mutator );
}

struct FixArrayDimension {
        const ResolveContext & context;
        FixArrayDimension(const ResolveContext & context) : context( context ) {}

        template< typename PtrType >
        const PtrType * previsitImpl( const PtrType * type ) {
                // Note: resolving dimension expressions seems to require duplicate logic,
                // here and Resolver.cpp: handlePtrType

                if (!type->dimension) return type;
                auto mutType = mutate(type);
                auto globalSizeType = context.global.sizeType;
                ast::ptr<ast::Type> sizetype = globalSizeType ? globalSizeType : new ast::BasicType( ast::BasicKind::LongUnsignedInt );
                mutType->dimension = findSingleExpression(type->dimension, sizetype, context );

                if (InitTweak::isConstExpr(mutType->dimension)) {
                        mutType->isVarLen = ast::LengthFlag::FixedLen;
                }
                else {
                        mutType->isVarLen = ast::LengthFlag::VariableLen;
                }
                return mutType;
        }

        const ast::ArrayType * previsit (const ast::ArrayType * arrayType) {
                return previsitImpl( arrayType );
        }

        const ast::PointerType * previsit (const ast::PointerType * pointerType) {
                return previsitImpl( pointerType );
        }
};

const ast::Type * fixArrayType( const ast::Type * type, const ResolveContext & context ) {
        ast::Pass<FixArrayDimension> visitor(context);
        return type->accept(visitor);
}

const ast::ObjectDecl * fixObjectType( const ast::ObjectDecl * decl , const ResolveContext & context ) {
        if ( decl->isTypeFixed ) {
                return decl;
        }

        auto mutDecl = mutate(decl);
        fixObjectInit(decl, context);
        {
                auto resolvedType = resolveTypeof(decl->type, context);
                resolvedType = fixArrayType(resolvedType, context);
                mutDecl->type = resolvedType;
        }

        // Do not mangle unnamed variables.
        if ( !mutDecl->name.empty() ) {
                mutDecl->mangleName = Mangle::mangle(mutDecl);
        }

        mutDecl->type = renameTyVars(mutDecl->type, RenameMode::GEN_EXPR_ID);
        mutDecl->isTypeFixed = true;

        auto enumInst = decl->type.as<ast::EnumInstType>();
        if ( enumInst && enumInst->base->isCfa ) {
                if ( auto init = decl->init.as<ast::SingleInit>() ) {
                        if ( auto initExpr = init->value.as<ast::ConstantExpr>() ) {
                                if ( initExpr->result.as<ast::ZeroType>() ) {
                                        auto newInit = new ast::SingleInit( init->location, 
                                                ast::UntypedExpr::createCall( init->location, "lowerBound", {} )
                                        );
                                        mutDecl->init = newInit;
                                }
                        }
                }
        }

        return mutDecl;
}

const ast::ObjectDecl *fixObjectInit(
                const ast::ObjectDecl *decl, const ResolveContext &context) {
        if ( decl->isTypeFixed ) {
                return decl;
        }

        if ( auto listInit = decl->init.as<ast::ListInit>() ) {
                for ( size_t k = 0; k < listInit->designations.size(); k++ ) {
                        const ast::Designation *des = listInit->designations[k].get();
                        // Desination here
                        ast::Designation * newDesignation = new ast::Designation(des->location);
                        std::deque<ast::ptr<ast::Expr>> newDesignators;

                        for ( ast::ptr<ast::Expr> designator : des->designators ) {
                                // Stupid flag variable for development, to be removed
                                if ( const ast::NameExpr * designatorName = designator.as<ast::NameExpr>() ) {
                                        auto candidates = context.symtab.lookupId(designatorName->name);
                                        // Does not work for the overloading case currently
                                        // assert( candidates.size() == 1 );
                                        if ( candidates.size() != 1 ) return decl;
                                        auto candidate = candidates.at(0);
                                        if ( const ast::EnumInstType * enumInst = dynamic_cast<const ast::EnumInstType *>(candidate.id->get_type())) {
                                                // determine that is an enumInst, swap it with its const value
                                                assert( candidates.size() == 1 );
                                                const ast::EnumDecl * baseEnum = enumInst->base;
                                                // Need to iterate over all enum value to find the initializer to swap
                                                for ( size_t m = 0; m < baseEnum->members.size(); ++m ) {
                                                        const ast::ObjectDecl * mem = baseEnum->members.at(m).as<const ast::ObjectDecl>();
                                                        if ( baseEnum->members.at(m)->name == designatorName->name ) {
                                                                assert( mem );
                                                                newDesignators.push_back( ast::ConstantExpr::from_int(designator->location, m) );
                                                                break;
                                                        }
                                                }
                                        } else {
                                                newDesignators.push_back( des->designators.at(0) );
                                        }
                                } else {
                                        newDesignators.push_back( des->designators.at(0) );
                                }
                        }
                        newDesignation->designators = newDesignators;
                        listInit = ast::mutate_field_index(listInit, &ast::ListInit::designations, k, newDesignation);
                }
        }
        return decl;
}

} // namespace ResolvExpr

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