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18th ACM SIGPLAN International Conference on Functional Programming

作者： Chlipala, Adam MIT CSAIL Cambridge MA USA

ISBN: (纸本)9781450323260

We report on the design and implementation of an extensible programming language and its intrinsic support for formal verification. Our language is targeted at low-level programming of infrastructure like operating systems and runtime systems. It is based on a cross-platform core combining characteristics of assembly languages and compiler intermediate languages. From this foundation, we take literally the saying that C is a "macro assembly language": we introduce an expressive notion of certified low-level macros, sufficient to build up the usual features of C and beyond as macros with no special support in the core. Furthermore, our macros have integrated support for strongest postcondition calculation and verification condition generation, so that we can provide a high-productivity formal verification environment within Coq for programs composed from any combination of macros. Our macro interface is expressive enough to support features that low-level programs usually only access through external tools with no formal guarantees, such as declarative parsing or SQL-inspired querying. The abstraction level of these macros only imposes a compile-time cost, via the execution of functional Coq programs that compute programs in our intermediate language;but the run-time cost is not substantially greater than for more conventional C code. We describe our experiences constructing a full C-like language stack using macros, with some experiments on the verifiability and performance of individual programs running on that stack.

关键词： generative metaprogramming interactive proof assistants low-level programming languages functional programming

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The Bedrock Structured Programming System Combining generative metaprogramming and Hoare Logic in an Extensible Program Verifier

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ACM SIGPLAN NOTICES 2013年第9期48卷 391-402页

作者： Chlipala, Adam MIT CSAIL United States

关键词： generative metaprogramming interactive proof assistants low-level programming languages functional programming

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PyOP2: A High-Level Framework for Performance-Portable Simulations on Unstructured Meshes

PyOP2: A High-Level Framework for Performance-Portable Simul...

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25th ACM/IEEE International Conference for High Performance Computing, Networking, Storage and Analysis (SC)

作者： Rathgeber, Florian Markall, Graham R. Mitchell, Lawrence Loriant, Nicolas Ham, David A. Bertolli, Carlo Kelly, Paul H. J. Univ London Imperial Coll Sci Technol & Med Dept Comp London SW7 2AZ England Univ London Imperial Coll Sci Technol & Med Grantham Inst Climate Change London SW7 2AZ England Univ Edinburgh EPCC Edinburgh EH9 3JZ Midlothian Scotland

ISBN: (纸本)9780769549569;9781467362184

Emerging many-core platforms are very difficult to program in a performance portable manner whilst achieving high efficiency on a diverse range of architectures. We present work in progress on PyOP2, a high-level embedded domain-specific language for mesh-based simulation codes that executes numerical kernels in parallel over unstructured meshes. Just-in-time kernel compilation and parallel scheduling are delayed until runtime, when problem-specific parameters are available. Using generative metaprogramming, performance portability is achieved, while details of the parallel implementation are abstracted from the programmer. PyOP2 kernels for finite element computations can be generated automatically from equations given in the domain-specific Unified Form Language. Interfacing to the multi-phase CFD code Fluidity through a very thin layer on top of PyOP2 yields a general purpose finite element solver with an input notation very close to mathematical formulae. Preliminary performance figures show speedups of up to 3.4x compared to Fluidity's built-in solvers when running in parallel.

关键词： code generation domain-specific languages finite-element methods generative metaprogramming high-level frameworks just-in-time compilation performance portability

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