An object oriented dynamic type system for reasoning with. Pdf debugging optimized code with dynamic deoptimization. Feb 12, 2010 concepts in object oriented programming languages 1. Do objectoriented languages need special hardware support. This is surprising, considering that encapsulation is one of the most fundamental and important concepts behind objectoriented programming and that it is es. Although this comparison is part of the eiffel pages, its intent is to provide a balanced coverage and to generate light, not heat. Object oriented programming uses objects, but not all of the associated techniques and structures are supported directly in languages that claim to support oop. Optimizing compiler technology for self, a dynamicallytyped objectoriented programming language craig chambers david ungar stanford university abstract dynamicallytyped objectoriented languages please programmers, but their lack of static type information penalizes performance. Optimizing dynamicallytyped objectoriented languages with. Our self implementation runs twice as fast as the fastest smalltalk implementation, despite selfs lack of classes and explicit variables. Fast and effective optimization of statically typed object. For me, a purely object oriented language must have two qualities.
A language can force you to use objects if everything is an object, for example but using one of those languages isnt going to force you to learn objectoriented programming i do not use much of inheritance nor multiple instances. As a consequence, dynamicallytyped languages have only limited support for encapsulation. Classes versus prototypes in objectoriented languages. Coloring, a versatile technique for implementing objectoriented. Grift applies this optimization to proxied references and tuples as well. Wholeprogram optimization of objectoriented languages. This is surprising, considering that encapsulation is one of the most fundamental and important concepts behind object oriented programming and that it is es. Iterative type analysis and extended message splitting have cut the performance penalty for dynamicallytyped objectoriented languages in half. Attempts to adapt procedural type systems to objectoriented languages have resulted in. A language can force you to use objects if everything is an object, for example but using one of those languages isnt going to force you to learn object oriented programming. A type declaration and inference system for smalltalk request pdf.
Were upgrading the acm dl, and would like your input. As a consequence, dynamically typed languages have only limited support for encapsulation. Optimizing compilers for objectoriented languages apply static. Wholeprogram optimization of object oriented languages chambers et al.
Functional programming has emerged since the mid2000s as an attractive basis for software construction. Static class analysis provides a conservative upper bound on the set of classes of which the receiver of a message can be an instance. The second ingredient for scalas impressive adoption history is that it rides, and to a certain degree drives, the emerging trend of combining functional and objectoriented programming. An efficient implementation of self a dynamicallytyped. We have developed and implemented techniques that eliminate the space and time costs of these features. Optimizing compiler technology for self, a dynamicallytyped. Unifying functional and objectoriented programming with. In a pure objectoriented language this is the only runtime error that can occur. Implementations of dynamicallytyped objectoriented languages have been limited by the paucity of type information available to the compiler. Optimizing dynamicallytyped 0 bject oriented languages withpolymorphic inline caches urs htilzle craig chambers david ungart computer systems laboratory, stanford university, stanford, ca 94305. This disparity in performance stemmed largely from the relatively slow speed and high frequency of message passing and from the lack of type information which could be used to reduce these costs. The features listed below are common among languages considered to be strongly class and object oriented or multiparadigm with oop support, with notable exceptions mentioned.
Gradual typing combines static and dynamic typing in the same program. We have developed and implemented techniques that double the performance of dynamicallytyped objectoriented languages. Which programming language is fully object oriented. Dynamic deoptimization transforms old compiled code which may contain inlined copies of the old. Optimization of objectoriented programs using static. Every function is a method and methods are always called on an object. Many objectoriented ideas originated or were popularised by the smalltalk group, which built on alan. We propose a new approach to the optimization of dynamicallytyped object oriented languages based on polymorphic inline caches pics.
To compensate for the absence of classes, our system uses implementationlevelmaps to transparently group objects cloned. Encapsulation in object oriented languages has traditionally been based on static type systems. The object model in simula was based on procedures activation records, with objects originally described as procedures that return a pointer to their own activation record. Implementing statically typed objectoriented programming languages roland ducournau lirmm cnrs et universit. Self is a pure objectoriented language designed for rapid. In a dynamically typed programming language smalltalk or lisp, a variable is just a name. Iterative type analysis and extended message splitting. Implementing statically typed objectoriented programming. We have developed and implemented techniques that double the performance of dynamically typed object oriented languages. The features listed below are common among languages considered to be strongly class and objectoriented or multiparadigm with oop support, with notable exceptions mentioned. We propose a new approach to the optimization of dynamicallytyped objectoriented languages based on polymorphic inline caches pics. As with other compiler analyses, class analysis can be performed at a variety. Concepts in object oriented programming languages 1.
The object model in simula was based on procedures. The abundance of the type information provided by pics suggests a new compilation approach for these languages, adaptive compilation. Reconciling responsiveness with performance in pure object. Fast and effective optimization of statically typed objectoriented languages by david francis bacon doctor of philosophy in computer science university of california, berkeley professor susan l. Objectoriented encapsulation for dynamically typed languages. Wholeprogram optimization of objectoriented languages chambers et al.
Optimizing dynamicallytyped objectoriented languages with polymorphic inline caches. Comparison of programming languages objectoriented. Keywords and phrases type specialization, guards optimization, automatic. For a set of typical objectoriented programs, the experimental system obtains a median speedup of 27% over the current self compiler and signi. Javascript is an objectoriented programming language in. Concepts in object oriented programming languages dr. Cse 505 types in objectoriented languages november 1999. Apr 03, 2011 urs holzle, craig chambers, david ungar, optimizing dynamicallytyped objectoriented languages with polymorphic inline caches, proceedings of the european conference on objectoriented programming, p. Optimizing dynamicallytyped 0 bjectoriented languages. The impact on memory management the meaning of assignment the distinction between testing for identity and testing for equality 42.
Optimizing dynamicallytyped objectoriented languages. Typically, this type of programming language uses multiple va. Historically, dynamicallytyped objectoriented languages have run much slower than staticallytyped languages. An efficient implementation of self, a dynamicallytyped. A collection of operation signatures, where each signature consists of the operation name, the types of the arguments, and the type of the results we will say that an object is of an abstract type if it has the properties defined by that type. Such compilers may succeed in generating very efficient code for the. Encapsulation in objectoriented languages has traditionally been based on static type systems. What are the different types of programming languages. The procedural programming language is used to execute a sequence of statements which lead to a result. With a characterization study of various workloads, we find that the overhead of these persistence. Everything in the language must be an object and a firstclass value. The second ingredient for scalas impressive adoption history is that it rides, and to a certain degree drives, the emerging trend of combining functional and object oriented programming. Cse 505 types in object oriented languages november 1999. Pdf dynamicallytyped objectoriented languages please programmers, but their lack of static type information penalizes performance.
To compensate for the absence of classes, our system uses implementationlevelmaps to transparently group objects cloned from the same. Objectoriented programming uses objects, but not all of the associated techniques and structures are supported directly in languages that claim to support oop. Dynamicallytyped languages have fewer options to simplify gpu. I do not use much of inheritance nor multiple instances.
Optimizing dynamicallytyped objectoriented languages withpolymorphic inline caches. Jun 14, 2006 implementations of dynamically typed object oriented languages have been limited by the paucity of type information available to the compiler. The following tables compare four major oo languages. This alternative characterization of coloring amounts to note that a color table cannot. We propose a new approach to the optimization of dynamicallytyped objectoriented languages based on.