source: src/InitTweak/FixGlobalInit.cc

//
// 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 {

namespace {

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 GlobalFixer::previsit(const ast::ObjectDecl * objDecl) {
        auto mutDecl = mutate(objDecl);
        assertf(mutDecl == objDecl, "Global object decl must be unique");
        auto ctorInit = objDecl->init.as<ast::ConstructorInit>();
        if ( nullptr == ctorInit ) return;

        // 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 );
        } // if
        if ( const ast::Stmt * ctor = ctorInit->ctor ) {
                addDataSectionAttribute(mutDecl);
                initStmts.push_back( ctor );
                mutDecl->init = nullptr;
        } else if ( const ast::Init * init = ctorInit->init ) {
                mutDecl->init = init;
        } else {
                // no constructor and no initializer, which is okay
                mutDecl->init = nullptr;
        }
}

} // namespace

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
}

} // namespace InitTweak

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