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ECOOP
2010
Springer

Recency Types for Analyzing Scripting Languages

9 years 8 months ago
Recency Types for Analyzing Scripting Languages
Abstract. With the current surge of scripting technologies, large programs are being built with dynamically typed languages. As these programs grow in size, semantics-based tools gain importance for detecting programming errors as well as for program understanding. As a basis for such tools, we propose a descriptive type system for an imperative call-by-value lambda calculus with objects. The calculus models essential features of JavaScript, a widely used dynamically-typed language: first-class functions, objects as property maps, and prototypes. Our type system infers precise singleton object types for recently allocated objects. These object types are handled flow-sensitively and change during the objects’ initialization phase. The notion of recency provides an automatic criterion to subsume these precise object types to summary object types, which are handled flow-insensitively. The criterion applies on a per-object basis. Thus, the type system identifies a generalized initial...
Phillip Heidegger, Peter Thiemann
Added 19 Jul 2010
Updated 19 Jul 2010
Type Conference
Year 2010
Where ECOOP
Authors Phillip Heidegger, Peter Thiemann
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