source: src/CodeGen/FixNames.cc@ df47e2f

//
// 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.
//
// FixNames.cc --
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Rob Schluntz
// Last Modified On : Mon Apr 11 15:38:10 2016
// Update Count     : 1
//

#include <memory>

#include "FixNames.h"
#include "SynTree/Declaration.h"
#include "SynTree/Expression.h"
#include "SynTree/Visitor.h"
#include "SymTab/Mangler.h"
#include "OperatorTable.h"
#include "FixMain.h"

namespace CodeGen {
        class FixNames : public Visitor {
          public:
                virtual void visit( ObjectDecl *objectDecl );
                virtual void visit( FunctionDecl *functionDecl );

                virtual void visit( CompoundStmt *compoundStmt );
          private:
                int scopeLevel = 1;

                void fixDWT( DeclarationWithType *dwt );
        };

        std::string mangle_main() {
                FunctionType* main_type;
                std::unique_ptr<FunctionDecl> mainDecl { new FunctionDecl(
                        "main", 
                        DeclarationNode::NoStorageClass, 
                        LinkageSpec::Cforall, 
                        main_type = new FunctionType( Type::Qualifiers(), true ), 
                        nullptr, false, false
                ) };
                main_type->get_returnVals().push_back( 
                        new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), nullptr )
                );

                auto&& name = SymTab::Mangler::mangle( mainDecl.get() );
                // std::cerr << name << std::endl;
                return name;
        }
        std::string mangle_main_args() {
                FunctionType* main_type;
                std::unique_ptr<FunctionDecl> mainDecl { new FunctionDecl(
                        "main", 
                        DeclarationNode::NoStorageClass, 
                        LinkageSpec::Cforall, 
                        main_type = new FunctionType( Type::Qualifiers(), false ), 
                        nullptr, false, false
                ) };
                main_type->get_returnVals().push_back( 
                        new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), nullptr )
                );

                mainDecl->get_functionType()->get_parameters().push_back( 
                        new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), nullptr )
                );

                mainDecl->get_functionType()->get_parameters().push_back( 
                        new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, 
                        new PointerType( Type::Qualifiers(), new PointerType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::Char ) ) ), 
                        nullptr )
                );

                auto&& name = SymTab::Mangler::mangle( mainDecl.get() );
                // std::cerr << name << std::endl;
                return name;
        }

        bool is_main(const std::string& name) {
                static std::string mains[] = { 
                        mangle_main(), 
                        mangle_main_args()
                };

                for(const auto& m : mains) {
                        if( name == m ) return true;
                }
                return false;
        }

        void fixNames( std::list< Declaration* > translationUnit ) {
                FixNames fixer;
                acceptAll( translationUnit, fixer );
        }

        void FixNames::fixDWT( DeclarationWithType *dwt ) {
                if ( dwt->get_name() != "" ) {
                        if ( LinkageSpec::isDecoratable( dwt->get_linkage() ) ) {
                                dwt->set_mangleName( SymTab::Mangler::mangle( dwt ) );
                                dwt->set_scopeLevel( scopeLevel );
                        } // if
                } // if
        }

        void FixNames::visit( ObjectDecl *objectDecl ) {
                Visitor::visit( objectDecl );
                fixDWT( objectDecl );
        }

        void FixNames::visit( FunctionDecl *functionDecl ) {
                Visitor::visit( functionDecl );
                fixDWT( functionDecl );

                if(is_main( SymTab::Mangler::mangle(functionDecl, true, true) )) {
                        int nargs = functionDecl->get_functionType()->get_parameters().size();
                        if( !(nargs == 0 || nargs == 2 || nargs == 3) ) {
                                throw SemanticError("Main expected to have 0, 2 or 3 arguments\n", functionDecl); 
                        }
                        functionDecl->get_statements()->get_kids().push_back( new ReturnStmt( noLabels, new ConstantExpr( Constant( new BasicType( Type::Qualifiers(), BasicType::SignedInt ), "0") ) ) );
                        CodeGen::FixMain::registerMain( functionDecl );
                }
        }

        void FixNames::visit( CompoundStmt *compoundStmt ) {
                scopeLevel++;
                Visitor::visit( compoundStmt );
                scopeLevel--;
        }
} // namespace CodeGen

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