source: src/InitTweak/InitTweak.h @ c36a419

//
// 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.
//
// InitTweak.h --
//
// Author           : Rob Schluntz
// Created On       : Fri May 13 11:26:36 2016
// Last Modified By : Andrew Beach
// Last Modified On : Wed Sep 22  9:21:00 2022
// Update Count     : 9
//

#pragma once

#include <list>               // for list
#include <memory>             // for shared_ptr
#include <string>             // for string, allocator
#include <vector>

#include "AST/Fwd.hpp"        // for AST nodes

// helper functions for initialization
namespace InitTweak {
        bool isAssignment( const ast::FunctionDecl * decl );
        bool isDestructor( const ast::FunctionDecl * decl );
        bool isDefaultConstructor( const ast::FunctionDecl * decl );
        bool isCopyConstructor( const ast::FunctionDecl * decl );
        bool isCopyFunction( const ast::FunctionDecl * decl );

        /// returns the base type of the first parameter to a constructor/destructor/assignment function
        const ast::Type * getTypeofThis( const ast::FunctionType * ftype );

        /// returns the first parameter of a constructor/destructor/assignment function
        const ast::ObjectDecl * getParamThis(const ast::FunctionDecl * func);

        /// generate a bitwise assignment operation.
        ast::Expr * createBitwiseAssignment( const ast::Expr * dst, const ast::Expr * src);

        /// transform Initializer into an argument list that can be passed to a call expression
        std::vector< ast::ptr< ast::Expr > > makeInitList( const ast::Init * init );

        /// True if the resolver should try to construct dwt
        bool tryConstruct( const ast::DeclWithType * dwt );

        /// True if the type can have a user-defined constructor
        bool isConstructable( const ast::Type * t );

        /// True if the Initializer contains designations
        bool isDesignated( const ast::Init * init );

        /// True if the ObjectDecl's Initializer nesting level is not deeper than the depth of its
        /// type, where the depth of its type is the number of nested ArrayTypes + 1
        bool checkInitDepth( const ast::ObjectDecl * objDecl );

        /// True if stmt is a call statement where the function called is intrinsic and takes one parameter.
        /// Intended to be used for default ctor/dtor calls, but might have use elsewhere.
        /// Currently has assertions that make it less than fully general.
        bool isIntrinsicSingleArgCallStmt( const ast::Stmt * stmt );

        /// get all Ctor/Dtor call expressions from a Statement
        std::vector< const ast::Expr * > collectCtorDtorCalls( const ast::Stmt * stmt );

        /// returns true if expr is trivially a compile-time constant
        bool isConstExpr( const ast::Expr * expr );
        bool isConstExpr( const ast::Init * init );

        /// Modifies objDecl to have:
        ///    __attribute__((section (".data#")))
        /// which makes gcc put the declared variable in the data section,
        /// which is helpful for global constants on newer gcc versions,
        /// so that CFA's generated initialization won't segfault when writing it via a const cast.
        /// The trailing # is an injected assembly comment, to suppress the "a" in
        ///    .section .data,"a"
        ///    .section .data#,"a"
        /// to avoid assembler warning "ignoring changed section attributes for .data"
        void addDataSectionAttribute( ast::ObjectDecl * objDecl );

        class InitExpander final {
        public:
                using IndexList = std::vector< ast::ptr< ast::Expr > >;
                class ExpanderImpl;

        private:
                std::shared_ptr< ExpanderImpl > expander;
                std::vector< ast::ptr< ast::Expr > > crnt;
                // invariant: list of size 2N (elements come in pairs [index, dimension])
                IndexList indices;

        public:
                /// Expand by stepping through init to get each list of arguments
                InitExpander( const ast::Init * init );

                /// Always expand to expression
                InitExpander( const ast::Expr * expr );

                std::vector< ast::ptr< ast::Expr > > operator* ();
                InitExpander & operator++ ();

                /// builds statement which has the same semantics as a C-style list initializer (for array
                /// initializers) using callExpr as the base expression to perform initialization.
                /// Mutates callExpr
                ast::ptr< ast::Stmt > buildListInit( ast::UntypedExpr * callExpr );

                void addArrayIndex( const ast::Expr * index, const ast::Expr * dimension );

                void clearArrayIndices();

                bool addReference();
        };
} // namespace InitTweak

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