Practical WebAssembly/

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Generating asm.js Using Emscripten

Generating asm.js Using Emscripten

Learn how Emscripten creates WebAssembly binary to optimize the compilation.

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We’ll use Emscripten to port C/C++ programs into asm.js or the WebAssembly binary and then run them inside the JavaScript engine.

Note: Programming languages such as Lua and Python have a C/C++ runtime. With Emscripten, we can port the runtime as a WebAssembly module and execute them inside the JavaScript engine. This makes it easy to run Lua/Python code on the JavaScript engine. Thus, Emscripten and WebAssembly allow the running of native code in the JavaScript engine.

First, let’s create a sum.cpp file:

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extern "C" {
    unsigned sum(unsigned a, unsigned b) {
    return a + b;
  }
}

Consider extern "C" (line 1) as something like an export mechanism. All the functions inside are available as an exported function without any changes to their name. Then, we ...

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