WebAssembly has arrived in Firefox 52 and Chrome 57. It brings the ability for developers to compile applications from C or C++ for the web. To help developers understand and experiment with its binary format Mozilla has created WebAssembly Explorer.
To prove the point about WASM's perfromance Epic has produced this demo:
Now that WebAssembly is available in both Firefox and Chrome developers will want to know more about. It's not a case of learning to write WebAssembly code. Instead a compiler takes C or C++ code (more languages expected in the future) and outputs the binary format that the browser then converts to machine code.
Mozilla's WebAssembly Explorer is a tool that introduces WASM and how to use it. As explained in the 7-minute video preview that walks you though using the Explorer, the way WebAssembly works is that it defines an abstract virtual machine that can be used as a compiler target.
Although WASM has a binary format the WebAssembly Explorer compiler provides a human-readable textual representation. So when you type code into the 1st panel and click compile, you see this ??intermediate language in the middle pane and the the x86 Assembly Code that the browser eventually produces in the panel at the right.
He also points out that while WebAssembly Explorer is "a great learning tool" it is not suitable for complex programs and that developers should instead use Emscripten which has been extended to produces WASM as well as the asm.js it was originally written to output.
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