WebAssembly · Medium

Lesson 1 · On the house

Loads, stores, offset and align

Memory immediates, sign-extending narrow loads, and what align really promises.

Lesson 2

memory.grow and page math

64 KiB pages, memory.size, memory.grow return values, and max limits.

Lesson 3

Globals and the shadow stack

Mutable globals, imports and exports, and the __stack_pointer convention.

Lesson 4

br_table and switch lowering

Jump tables, nested blocks, default target, and why order matters.

Lesson 5

Traps and numeric edge cases

Integer divide traps, trunc vs trunc_sat, wrap and extend conversions.

Lesson 6

The JS API in practice

instantiate from bytes, imports object, Memory and exported functions in Node.

Lesson 7

Strings across the boundary

Pointer-length pairs, TextEncoder into linear memory, and who owns the bytes.

Lesson 8

Toolchains: Emscripten, Rust, wabt

emcc flags, cargo wasm targets, and wabt tools for inspecting output.

Lesson 9

Imports from the host

Function, memory and table imports; host callbacks and link-time types.

Lesson 10

Dynamic linking and side modules

Shared memory and table, relocations, and Emscripten MAIN/SIDE modules.