WebAssembly Explorer: Optimize C/C++ Code for Browser Execution
WebAssembly enables programs written in languages like C/C++ to run in browsers, and Mozilla’s WebAssembly Explorer provides a visual UI that reveals compiler optimizations—such as choosing between division and shift operations—while developers can also use Emscripten for production‑grade compilation.
WebAssembly is a cross‑browser binary format designed to allow programs written in languages other than JavaScript—such as C/C++—to run in browsers, on servers, mobile or IoT devices.
The V8 engine already supports WebAssembly, and stable Chrome releases were expected to include full support by mid‑2017.
Because WebAssembly binaries are not human‑readable, Mozilla created the WebAssembly Explorer , an interactive tool that visualizes the compiler’s optimizations. For example, when compiling a division operation, the explorer shows whether the compiler chooses a traditional division instruction or a more efficient shift operation based on the C type.
The tool is intended for learning and experimentation; it is still in development and not suited for complex programs, but it is sufficient for basic educational purposes.
For production‑grade compilation, developers can use Emscripten , a tool originally built for asm.js that now also compiles C/C++ code to WebAssembly.
The original article includes a detailed video tutorial for further exploration.
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