source: src/InitTweak/InitTweak.h @ afe2939

//
// 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 : Fri Jul 19 14:18:00 2019
// Update Count     : 6
//

#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
#include "SynTree/SynTree.h"  // for Visitor Nodes

// helper functions for initialization
namespace InitTweak {
        const FunctionDecl * isAssignment( const Declaration * decl );
        const FunctionDecl * isDestructor( const Declaration * decl );
        const FunctionDecl * isDefaultConstructor( const Declaration * decl );
        const FunctionDecl * isCopyConstructor( const Declaration * decl );
        const FunctionDecl * isCopyFunction( const Declaration * decl, const std::string & fname );
        bool isCopyFunction( const ast::FunctionDecl * decl );

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

        /// returns the first parameter of a constructor/destructor/assignment function
        ObjectDecl * getParamThis( FunctionType * ftype );

        /// generate a bitwise assignment operation.
        ApplicationExpr * createBitwiseAssignment( Expression * dst, Expression * src );

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

        /// True if the resolver should try to construct dwt
        bool tryConstruct( DeclarationWithType * dwt );

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

        /// True if the Initializer contains designations
        bool isDesignated( Initializer * 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( ObjectDecl * objDecl );

        /// returns the declaration of the function called by the expr (must be ApplicationExpr or UntypedExpr)
        DeclarationWithType * getFunction( Expression * expr );
        const DeclarationWithType * getFunction( const Expression * expr );
        const ast::DeclWithType * getFunction( const ast::Expr * expr );

        /// Non-Null if expr is a call expression whose target function is intrinsic
        ApplicationExpr * isIntrinsicCallExpr( Expression * expr );
        const ast::ApplicationExpr * isIntrinsicCallExpr( const ast::Expr * expr);

        /// 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( Statement * stmt );
        bool isIntrinsicSingleArgCallStmt( const ast::Stmt * stmt );

        /// True if stmt is a call statement where the function called is intrinsic.
        bool isIntrinsicCallStmt( Statement * stmt );

        /// get all Ctor/Dtor call expressions from a Statement
        void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches );
        std::vector< ast::ptr< ast::Expr > > collectCtorDtorCalls( const ast::Stmt * stmt );

        /// get the Ctor/Dtor call expression from a Statement that looks like a generated ctor/dtor call
        Expression * getCtorDtorCall( Statement * stmt );

        /// returns the name of the function being called
        std::string getFunctionName( Expression * expr );
        std::string getFunctionName( const ast::Expr * expr );

        /// returns the argument to a call expression in position N indexed from 0
        Expression *& getCallArg( Expression * callExpr, unsigned int pos );
        const ast::Expr * getCallArg( const ast::Expr * call, unsigned pos );

        /// returns the base type of a PointerType or ArrayType, else returns NULL
        Type * getPointerBase( Type * );
        const ast::Type* getPointerBase( const ast::Type* );

        /// returns the argument if it is a PointerType or ArrayType, else returns NULL
        Type * isPointerType( Type * );

        /// returns true if expr is trivially a compile-time constant
        bool isConstExpr( Expression * expr );
        bool isConstExpr( Initializer * 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 addDataSectonAttribute( ObjectDecl * objDecl );

        class InitExpander_old {
        public:
                // expand by stepping through init to get each list of arguments
                InitExpander_old( Initializer * init );

                // always expand to expr
                InitExpander_old( Expression * expr );

                // iterator-like interface
                std::list< Expression * > operator*();
                InitExpander_old & 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
                Statement * buildListInit( UntypedExpr * callExpr );
                void addArrayIndex( Expression * index, Expression * dimension );
                void clearArrayIndices();
                bool addReference();

                class ExpanderImpl;

                typedef std::list< Expression * > IndexList;
        private:
                std::shared_ptr< ExpanderImpl > expander;
                std::list< Expression * > cur;

                // invariant: list of size 2N (elements come in pairs [index, dimension])
                IndexList indices;
        };

        class InitExpander_new {
        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_new( const ast::Init * init );

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

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

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