The Java-based Hume IDE provides a classic edit/run/debug text-based interactive programming environment, augmented with the Hume Diagram Tool(HDT) which displays two-dimensional box/wiring diagrams from Hume source programs. Diagram layout may be modified interactively and wires may be inspected to identify associated types. Here, we present an overview of the IDE, focusing on the HDT. We also...

This paper describes the HW-Hume level of the novel Hume language. HW-Hume is the simplest subset of Hume that we have identified. It provides strong formal properties but posseses limited abstraction capabilities. In this paper, we introduce HW-Hume, show some simple example programs, describe an eÆcient software implementation, and demonstrate how important properties can be exposed as part o...

HW-Hume is the decidable Hume level oriented to direct implementation in hardware. As a first stage in the development of a verified compiler from HW-Hume to Java, we have implemented the semantics of HW-Hume in the Isabelle/HOL theorem prover, enabling the automatic proof of correctness of programs in a Floyd/Hoare style.

We present a first approach towards a calculus of transformations of Hume boxes, using an extended version of Hume called Hierarchical Hume. We present and motivate Hierachical Hume, transformations and the calculus and derive some rules and strategies. The approach is then illustrated through two examples.

Hume is a novel language in the functional tradition, strongly oriented to systems requiring strong guarantees that resource bounds are met. To facilitate resource assurance, Hume enforces a separation of coordination and computation concerns, and deploys an abstract machine intermediary between implementations and analyses. These core design decisions also enable a high degree of portability a...

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Safety critical systems place additional requirements to the programming language used to implement them with respect to traditional environments. Examples of features that influence the suitability of a programming language in such environments include complexity of definitions, expressive power, bounded space and time and verifiability. Hume is a novel programming language with a design which...

With the emergence of commodity multicore architectures, exploiting tightly-coupled parallelism has become increasingly important. Hume is a novel formally-motivated programming language oriented to developing software where strong assurance of resource use is paramount, in particular embedded architecture. Functional programming languages, such as Hume, are, in principle, well placed to take a...

This paper presents a refined motion-tracking algorithm (the mean-shift algorithm) written in Hume. It also introduces an implementation of a formally guaranteed worst-case execution time analysis for Hume, and verifies this against hand analysis of a component of the algorithm. Finally, it describes the deployment of the algorithm in a Hume-based demonstrator AV.

In this paper we present an instrumented program logic for the embedded systems language Hume, suitable to reason about resource consumption. Matching the structure of Hume programs, it integrates two logics, a VDM-style program logic for the functional language and a TLA-style logic for the coordination language of Hume. We present a soundness proof of the program logic, and demonstrate the us...