source: src/InitTweak/FixGlobalInit.cc@ 1ccae59

//
// 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.
//
// FixGlobalInit.cc --
//
// Author           : Rob Schluntz
// Created On       : Mon May 04 15:14:56 2016
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Dec 13 23:41:10 2019
// Update Count     : 19
//

#include "FixGlobalInit.h"

#include <cassert>                 // for assert
#include <stddef.h>                // for NULL
#include <algorithm>               // for replace_if

#include "AST/Expr.hpp"
#include "AST/Node.hpp"
#include "AST/Pass.hpp"
#include "Common/UniqueName.h"     // for UniqueName
#include "InitTweak.h"             // for isIntrinsicSingleArgCallStmt

namespace InitTweak {
        class GlobalFixer : public ast::WithShortCircuiting {
        public:
                void previsit (const ast::ObjectDecl *);
                void previsit (const ast::FunctionDecl *) { visit_children = false; }
                void previsit (const ast::StructDecl *) { visit_children = false; }
                void previsit (const ast::UnionDecl *) { visit_children = false; }
                void previsit (const ast::EnumDecl *) { visit_children = false; }
                void previsit (const ast::TraitDecl *) { visit_children = false; }
                void previsit (const ast::TypeDecl *) { visit_children = false; }

                std::list< ast::ptr<ast::Stmt> > initStmts;
                std::list< ast::ptr<ast::Stmt> > destroyStmts;
        };

        void fixGlobalInit(ast::TranslationUnit & translationUnit, bool inLibrary) {
                ast::Pass<GlobalFixer> fixer;
                accept_all(translationUnit, fixer);

                // Say these magic declarations come at the end of the file.
                CodeLocation const & location = translationUnit.decls.back()->location;

                if ( !fixer.core.initStmts.empty() ) {
                        std::vector<ast::ptr<ast::Expr>> ctorParams;
                        if (inLibrary) ctorParams.emplace_back(ast::ConstantExpr::from_int(location, 200));
                        auto initFunction = new ast::FunctionDecl(location,
                                "__global_init__", {}, {}, {},
                                new ast::CompoundStmt(location, std::move(fixer.core.initStmts)),
                                ast::Storage::Static, ast::Linkage::C,
                                {new ast::Attribute("constructor", std::move(ctorParams))});

                        translationUnit.decls.emplace_back( initFunction );
                } // if

                if ( !fixer.core.destroyStmts.empty() ) {
                        std::vector<ast::ptr<ast::Expr>> dtorParams;
                        if (inLibrary) dtorParams.emplace_back(ast::ConstantExpr::from_int(location, 200));
                        auto destroyFunction = new ast::FunctionDecl( location,
                                "__global_destroy__", {}, {}, {},
                                new ast::CompoundStmt(location, std::move(fixer.core.destroyStmts)),
                                ast::Storage::Static, ast::Linkage::C,
                                {new ast::Attribute("destructor", std::move(dtorParams))});

                        translationUnit.decls.emplace_back(destroyFunction);
                } // if
        }

        void GlobalFixer::previsit(const ast::ObjectDecl * objDecl) {
                auto mutDecl = mutate(objDecl);
                assertf(mutDecl == objDecl, "Global object decl must be unique");
                if ( auto ctorInit = objDecl->init.as<ast::ConstructorInit>() ) {
                        // a decision should have been made by the resolver, so ctor and init are not both non-NULL
                        assert( ! ctorInit->ctor || ! ctorInit->init );

                        const ast::Stmt * dtor = ctorInit->dtor;
                        if ( dtor && ! isIntrinsicSingleArgCallStmt( dtor ) ) {
                                // don't need to call intrinsic dtor, because it does nothing, but
                                // non-intrinsic dtors must be called
                                destroyStmts.push_front( dtor );
                                // ctorInit->dtor = nullptr;
                        } // if
                        if ( const ast::Stmt * ctor = ctorInit->ctor ) {
                                addDataSectionAttribute(mutDecl);
                                initStmts.push_back( ctor );
                                mutDecl->init = nullptr;
                                // ctorInit->ctor = nullptr;
                        } else if ( const ast::Init * init = ctorInit->init ) {
                                mutDecl->init = init;
                                // ctorInit->init = nullptr;
                        } else {
                                // no constructor and no initializer, which is okay
                                mutDecl->init = nullptr;
                        } // if
                        // delete ctorInit;
                } // if
        }

} // namespace InitTweak

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