2,199 papers · page 67 of 110
Many program analysis techniques used by compilers are applicable only to programs whose control flow graphs are reducible. Node-splitting is a technique that can be used to convert any control flow graph to a reducible one. However, as has been observed for various node-splittin…
Given a prog=I and two variables p and q, thegLI of points-to analysis is to check if p can point to q in some execution of the prog ram. This well-studied problem plays a crucial role in compiler optimization. The problem is known to be undecidable when dynamic memory is allowed…
We present a coercive subtyping system for the calculus of constructions. The proposed system λCCOover≤ is obtained essentially by adding coercions and η-conversion to λC≤[10], which is a subtyping extension to the calculus of constructions without coercions. Following [17, 18], …
We present the design of a typed assembly language called TALT that supports heterogeneous tuples, disjoint sums, and a general account of addressing modes. TALT also implements the von Neumann model in which programs are stored in memory, and supports relative addressing. Type s…
We present a type theory for higher-order modules that accounts for many central issues in module system design, including translucency, applicativity, generativity, and modules as first-class values. Our type system harmonizes design elements from previous work, resulting in a s…
We present an interprocedural and compositional algorithm for nding pairs of compatible allocation sites, which have the property that no object allocated at one site is live at the same time as any object allocated at the other site. If an allocation site is compatible with itse…
We present a new polynomial-time randomized algorithm for discovering affine equalities involving variables in a program. The key idea of the algorithm is to execute a code fragment on a few random inputs, but in such a way that all paths are covered on each run. This makes it po…
We show how to efficiently obtain linear a priori bounds on the heap space consumption of first-order functional programs.The analysis takes space reuse by explicit deallocation into account and also furnishes an upper bound on the heap usage in the presence of garbage collection…
A bigraphical reactive system (BRS) involves bigraphs, in which the nesting of nodes represents locality, independently of the edges connecting them. BRSs represent a wide variety of calculi for mobility, including λ-calculus and ambient calculus. A labelled transition system (LT…
Ordered type theory is an extension of linear type theory in which variables in the context may be neither dropped nor re-ordered. This restriction gives rise to a natural notion of adjacency. We show that a language based on ordered types can use this property to give an exact a…
This paper presents a new distributed process calculus, called the M-calculus, that can be understood as a higher-order version of the Distributed Join calculus with programmable localities. The calculus retains the implementable character of the Distributed Join calculus while o…
The World-Wide Web Consortium (W3C) promotes XML and related standards, including XML Schema, XQuery, and XPath. This paper describes a formalization of XML Schema. A formal semantics based on these ideas is part of the official XQuery and XPath specification, one of the first us…
This paper proposes and develops the basic theory for a new approach to typing multi-stage languages based a notion of environment classifiers. This approach involves explicit but lightweight tracking -- at type-checking time -- of the origination environment for future-stage com…
Multimedia and network processing applications make extensive use of subword data. Since registers are capable of holding a full data word, when a subword variable is assigned a register, only part of the register is used. New embedded processors have started sup-porting instruct…
First-class continuations are a powerful computational effect, allowing the programmer to express any form of jumping. Types and effect systems can be used to reason about continuations, both in the source language and in the target language of the continuation-passing transform.…
We introduce a notion of guarded recursive (g.r.) datatype constructors, generalizing the notion of recursive datatypes in functional programming languages such as ML and Haskell.
A fundamental problem in the implementation of object-oriented languages is that of a frugal dispatching data structure, i.e., support for quick response to dispatching queries combined with compact representation of the type hierarchy and the method families. Previous theoretica…
The first order isomorphism problem is to decide whether two nonrecursive types using product- and function-type constructors, are isomorphic under the axioms of commutative and associative products, and currying and distributivity of functions over products. We show that this pr…
We study and further develop two language-based techniques for analyzing security protocols. One is based on a typed process calculus; the other, on untyped logic programs. Both focus on secrecy properties. We contribute to these two techniques, in particular by extending the for…
An adaptive computation maintains the relationship between its input and output as the input changes. Although various techniques for adaptive computing have been proposed, they remain limited in their scope of applicability. We propose a general mechanism for adaptive computing …