source: src/CodeGen/FixNames.cc @ 921cd82

//
// 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 : Peter A. Buhr
// Last Modified On : Fri Dec 13 23:39:14 2019
// Update Count     : 21
//

#include "FixNames.h"

#include <memory>                  // for unique_ptr
#include <string>                  // for string, operator!=, operator==

#include "Common/PassVisitor.h"
#include "Common/SemanticError.h"  // for SemanticError
#include "FixMain.h"               // for FixMain
#include "SymTab/Mangler.h"        // for Mangler
#include "SynTree/LinkageSpec.h"   // for Cforall, isMangled
#include "SynTree/Constant.h"      // for Constant
#include "SynTree/Declaration.h"   // for FunctionDecl, ObjectDecl, Declarat...
#include "SynTree/Expression.h"    // for ConstantExpr
#include "SynTree/Label.h"         // for Label, noLabels
#include "SynTree/Statement.h"     // for ReturnStmt, CompoundStmt
#include "SynTree/Type.h"          // for Type, BasicType, Type::Qualifiers
#include "SynTree/Visitor.h"       // for Visitor, acceptAll

namespace CodeGen {
        class FixNames : public WithGuards {
          public:
                void postvisit( ObjectDecl *objectDecl );
                void postvisit( FunctionDecl *functionDecl );

                void previsit( 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", Type::StorageClasses(), LinkageSpec::Cforall,
                                                                                                                                   main_type = new FunctionType( Type::Qualifiers(), true ), nullptr )
                                };
                main_type->get_returnVals().push_back(
                        new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::Cforall, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), nullptr )
                );

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

                main_type->get_parameters().push_back(
                        new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::Cforall, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), nullptr )
                );

                main_type->get_parameters().push_back(
                        new ObjectDecl( "", Type::StorageClasses(), 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 std::move(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 ) {
                PassVisitor<FixNames> fixer;
                acceptAll( translationUnit, fixer );
        }

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

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

        void FixNames::postvisit( FunctionDecl * 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) ) {
                                SemanticError(functionDecl, "Main expected to have 0, 2 or 3 arguments\n");
                        }
                        functionDecl->get_statements()->get_kids().push_back( new ReturnStmt( new ConstantExpr( Constant::from_int( 0 ) ) ) );
                        CodeGen::FixMain::registerMain( functionDecl );
                }
        }

        void FixNames::previsit( CompoundStmt * ) {
                scopeLevel++;
                GuardAction( [this](){ scopeLevel--; } );
        }
} // namespace CodeGen

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