NDLI: Frame rules from answer types for code pointers

Content Provider	ACM Digital Library
Author	Thielecke, Hayo
Abstract	We define a type system, which may also be considered as a simple Hoare logic, for a fragment of an assembly language that deals with code pointers and jumps. The typing is aimed at local reasoning in the sense that only the type of a code pointer is needed, and there is no need to know the whole code itself. The main features of the type system are separation logic connectives for describing the heap, and polymorphic answer types of continuations for keeping track of jumps. Specifically, we address an interaction between separation and answer types: frame rules for local reasoning in the presence of jumps are recovered by instantiating the answer type. However, the instantiation of answer types is not sound for all types. To guarantee soundness, we restrict instantiation to closed types, where the notion of closedness arises from biorthogonality (in a sense inspired by Krivine and Pitts). A machine state is orthogonal to a disjoint heap if their combination does not lead to a fault. Closed types are sets of machine states that are orthogonal to a set of heaps. We use closed types as well-behaved answer types.
Starting Page	309
Ending Page	319
Page Count	11
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/1111320.1111065
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	41
Issue Number	1
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Typed assembly language Code pointers Hoare logic Continuations Polymorphism
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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