WebLab is a system where students can write and test code using an online interface. Course coordinators can create assignments and exams, where they can define automated tests to verify that the student code meets requirements. As WebLab only offered support for programming languages which run on the Java Virtual Machine, it was limited to a specific set of languages. In this project, we have designed a system which enables WebLab to support arbitrary languages, while still being able to guarantee scalability, security and reliability. To limit the scope of this project, the focus was laid on the programming language Python. The designed system uses Docker containers to execute arbitrary code in a safe and isolated way. A test fuzzing system with tamper detection is used to achieve reliable test results. The system is flexible as support for new programming languages can be added with relatively little effort. This report describes the design of the system, the research that was done and the process used. The report concludes with recommendations for future work on this project.

This thesis introduces the FrameVM virtual machine and the Framed language. This language gives developers a target to compile to which concisely follows the scopes-as-frames model. This model allows language developers to derive the memory model based on the scope graphs. The core building blocks of Framed are frames, which contain all data including code. To demonstrate the viability of this model this paper also introduces a compiler from Scheme to Framed, focussing on complex control structures such as call-with-current-continuation and closures. As a result we aim to show that Framed is usable as a target language for compiling, even though it does not have a stack nor registers.