Sergey Lyubka

We will talk about some of the tricks we use to fit V7, the smallest JavaScript VM, into a few Kb: succinct and implicit data structures, compacting GC in O(1) space.

Virtual machines, especially those as complex as JavaScript, are often associated with big overheads. We will show how we traded time for space in order to reduce the runtime overhead and make even the smallest microcontrollers parse and run JavaScript, with all his quirks! We will talk about how to compact a heap and relocate all the pointers without using any extra temporary space, how to encode trees without pointers and how to traverse graphs without using a stack.

We will talk about porting Smart.JS, an open-source JavaScript-based IoT platform, to two very different hardware platforms: Espressif ESP8266 and TI CC3200, the difficulties we encountered and lessons that we learned working with them.

We will describe the Smart.JS platform (focusing on parts other than the V7 Javascript interpreter itself, which is the focus of another talk), and give the audience a taste of the embedded development process for two different platforms: one from an established player in the field and an up-and-coming recent entrant, very popular with enthusiasts. We will discuss the hardware, the SDK and the developer interactions, the challenges that we had with each of them and how we tackled them in each case.

Other people: Deomid Ryabkov