Vendredi 24 Mai

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Vendredi 24 Mai
Heure: 00:59 - 15:30
Lieu: Salle B107, bâtiment B, Université de Villetaneuse
Résumé: Game semantics and applications to compilation (2/3): Abstract machines for game semantics
Description: Dan Ghica We will examine new abstract machines for game semantics which correspond to networks of conventional computers, and which can be used as an intermediate representation for distributed compilation. This is achieved in two steps. First we introduce the HRAM, a Heap and Register Abstract Machine, an abstraction of a conventional computer, which can be structured into HRAM nets, an abstract point-to-point network model. HRAMs are multi-threaded and subsume communication by tokens (cf. IAM) or jumps (cf. JAM). Game Abstract Machines (GAM), are HRAMs with additional structure at the interface level, but no special operational capabilities. We show that GAMs cannot be naively composed, but composition must be mediated using special HRAM combinators. HRAMs are flexible enough to allow the representation of game models for languages with state (non-innocent games) or concurrency (non-alternating games). We illustrate the potential of this technique by implementing a toy distributed compiler for ICA, a higher-order programming language with shared state concurrency, thus significantly extending our previous distributed PCF compiler. We show that compilation is sound and memory-safe, i.e. no (distributed or local) garbage collection is necessary. [Joint work with Olle Fredriksson, to appear at LICS'13]