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| Content Provider | ACM Digital Library |
|---|---|
| Author | Neamtiu, Iulian Hicks, Michael Sewell, Peter Stoyle, Gareth Bierman, Gavin |
| Abstract | Dynamic software updates can be used to fix bugs or add features to a running program without downtime. Essential for some applications and convenient for others, low-level dynamic updating has been used for many years. Perhaps surprisingly, there is little high-level understanding or language support to help programmers write dynamic updates effectively.To bridge this gap, we present Proteus, a core calculus for dynamic software updating in C-like languages that is flexible, safe, and predictable. Proteus supports dynamic updates to functions (even active ones), to named types and to data, allowing on-line evolution to match source-code evolution as we have observed it in practice. We ensure updates are type-safe by checking for a property we call "con-freeness" for updated types t at the point of update. This means that non-updated code will not use t concretely beyond that point (concrete usages are via explicit coercions) and thus t's representation can safely change. We show how con-freeness can be enforced dynamically for a particular program state. We additionally define a novel and efficient static updateability analysis to establish con-freeness statically, and can thus automatically infer program points at which all future (well-formed) updates will be type-safe. We have implemented our analysis for C and tested it on several well-known programs. |
| Starting Page | 183 |
| Ending Page | 194 |
| Page Count | 12 |
| File Format | |
| ISSN | 03621340 15581160 |
| DOI | 10.1145/1047659.1040321 |
| Journal | ACM SIGPLAN Notices (SIGP) |
| Volume Number | 40 |
| 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 | Type inference Proteus Capability Updateability analysis Dynamic software updating |
| Content Type | Text |
| Resource Type | Article |
| Subject | Computer Graphics and Computer-Aided Design Software |
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