161 papers · page 3 of 9
There are several different gradual typing semantics, reflecting different trade-offs between performance and type soundness guarantees. Notably absent, however, are any data on which of these semantics developers actually prefer.
Modern object-oriented programming languages greatly alleviate the memory management for programmers. Despite the efficiency of garbage collection and Just-In-Time program analyzes, memory still remains prone to be wasted.
JavaScript code running in the Node.js runtime is a major platform for developers building cloud, mobile, or IoT applications. A fundamental concept in Node.js programming is the use of asynchronous callbacks and event loops to provide highly responsive applications. While concep…
Today's complex software systems combine high-level concurrency models. Each model is used to solve a specific set of problems. Unfortunately, debuggers support only the low-level notions of threads and shared memory, forcing developers to reason about these notions instead of th…
In dynamic object-oriented languages, low-level mechanisms such as just-in-time compilation, object allocation, garbage collection (GC) and method dispatch are often handled by virtual machines (VMs). VMs are typically implemented using static languages, allowing only few changes…
JavaScriptCore (JSC) is an open-source high-performance implementation of JavaScript. JSC is used in the WebKit open source browser engine as well as a system framework on macOS and iOS. This talk will give a broad high-level overview of JSC’s performance-oriented architecture, i…
Mixing static and dynamic type checking in the same language is catching on, with the TypeScript and Flow variants of JavaScript, the MyPy and Reticulated variants of Python, the Strongtalk and Gradualtalk variants of Smalltalk, as well as Typed Racket, Typed Clojure, and Perl 6.…
We provide formal semantics for a large subset of the Lua programming language, in its version 5.2. We validate our model by mechanizing it and testing it against the test suite of the reference interpreter of Lua, obtaining evidence that our model accurately represents the langu…
Swift is a modern multi-paradigm programming language with an extensive developer community and open source ecosystem. Swift 3's memory management strategy is based on Automatic Reference Counting (ARC) augmented with unsafe APIs for manually-managed memory. We have seen ARC cons…
Grace is a dynamic object oriented programming language designed to aid programming education. We present a formal model of and give an operational semantics for its object model and name resolution algorithm. Our main contributions are a systematic model of Grace’s name resoluti…
Programming language virtual machines (VMs) realize language semantics, enforce security properties, and execute applications efficiently. Fully Reflective Execution Environments (EEs) are VMs that additionally expose their whole structure and behavior to applications. This enabl…
Compiling MATLAB---a dynamic, array-based language---to JavaScript is an attractive proposal: the output code can be deployed on a platform used by billions and can leverage the countless hours that have gone into making JavaScript JIT engines fast. But before that can happen, th…
Optional typing is traditionally viewed as a compromise between static and dynamic type checking, where code without type annotations is not checked until runtime. We demonstrate that optional type annotations in Dart programs can be integrated into a flow analysis to provide sta…
We present a straightforward, call-by-value embedding of a small logic programming language with a simple complete search. We construct the entire language in 54 lines of Racket---half of which implement unification. We then layer over it, in 43 lines, a reconstruction of an exis…
Comparing the performance of programming languages is difficult because they differ in many aspects including preferred programming abstractions, available frameworks, and their runtime systems. Nonetheless, the question about relative performance comes up repeatedly in the resea…
The RPython framework takes an interpreter for a dynamic language as its input and produces a Virtual Machine (VM) for that language. RPython is being used to develop PyPy, a high-performance Python interpreter. However, the produced VM does not support parallel execution since t…
The type system in the Dart programming language is deliberately designed to be unsound: for a number of reasons, it may happen that a program encounters type errors at runtime although the static type checker reports no warnings. According to the language designers, this ensures…
jQuery is the most popular JavaScript library but the state-of-the-art static analyzers for JavaScript applications fail to analyze simple programs that use jQuery. In this paper, we present a novel abstract string domain whose elements are simple regular expressions that can rep…
The R language, from the point of view of language design and implementation, is a unique combination of various programming language concepts. It has functional characteristics like lazy evaluation of arguments, but also allows expressions to have arbitrary side effects. Many ru…
Multiple inheritance is often criticised for the ambiguity that arises when multiple parents want to pass on a feature with the same name to their offspring. A survey of programming languages reveals that no programming language has an inherently implicit and dynamic approach to …