Alias Types for Recursive Data Structures

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Alias Types for Recursive Data Structures
Linear type systems permit programmers to deallocate or explicitly recycle memory, but they are severly restricted by the fact that they admit no aliasing. This paper describes a pseudo-linear type system that allows a degree of aliasing and memory reuse as well as the ability to define complex recursive data structures. Our type system can encode conventional linear data structures such as linear lists and trees as well as more sophisticated data structures including cyclic and doubly-linked lists and trees. In the latter cases, our type system is expressive enough to represent pointer aliasing and yet safely permit destructive operations such as object deallocation. We demonstrate the flexibility of our type system by encoding two common compiler optimizations: destination-passing style and Deutsch-Schorr-Waite or "link-reversal" traversal algorithms.
David Walker, J. Gregory Morrisett
Added 25 Aug 2010
Updated 25 Aug 2010
Type Conference
Year 2000
Where TIC
Authors David Walker, J. Gregory Morrisett
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