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Other compilers than Emscripten, and other compiler frameworks than LLVM, will join the mix. These prototypes will evolve and track draft specification changes as WebAssembly matures and receives progressively more developer testing. Another prototype: a JS AST compressor (encoder). But as native wasm decoders appear in top engines (see the V8 native prototype decoder), Emscripten will auto-configure for best results.

How: If you use Emscripten, then wasm support via a command-line flag will at first include and target the prototype polyfill. Yes, wasm should relieve JS from having to serve two masters. No, JS isnвЂ™t going away in any foreseeable future. Finally, once browsers support the WebAssembly syntax natively, JS and wasm can diverge, without introducing unsafe or inappropriate features into JS just for use by compilers sourcing a few radically different programming languages. A secondary consideration: JS has a few awkward corners even in its asm.js subset. Transport compression is required and saves bandwidth, but decompression before parsing hurts. Why: asm.js is great, but once engines optimize for it, the parser becomes the hot spot - very hot on mobile devices. Yes, we are aiming to develop the WebвЂ™s polyglot-programming-language object-file format. Examples of possible longer-term divergence: zero-cost exceptions, dynamic linking, call/cc. This remains crucial even as JS and asm.js evolve to sprout shared memory threads and SIMD support. ItвЂ™s crucial that wasm and asm stay equivalent for a decent interval, to support polyfilling of wasm support via JS. wasm filename suffix, a new binary syntax for low-level safe code, initially co-expressive with asm.js, but in the long run able to diverge from JSвЂ™s semantics, in order to best serve as common object-level format for multiple source-level programming languages.

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Today IвЂ™m pleased to announce that cross-browser work has begun on WebAssembly, a new intermediate representation for safe code on the Web.

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Rather, JS is one syntax for a portable and safe machine language, letвЂ™s say. ItвЂ™s by now a clichГ© that JS has become the assembly language of the Web. Adding a second (bytecode) syntax has looked like a вЂњnow you have two problemsвЂќ loss, against the alternative of one syntax. Web вЂњuserland codeвЂќ, in contrast, can be written in a great many languages. In any event, whether analogous to C or assembly, JS has had a lock on the вЂњkernelвЂќ of the client side.

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Elsewhere in that sub-thread the analogue of JS was identified as architecture-specific assembly code, where the CPU architecture is fixed by physical reality, while software is written in virtual languages compiled to machine code, or run through interpreters. One does not get to write kernel code in any language, at least not yet.

In an HN sub-thread sparked by my ModernWeb.tw slides, I concurred with Patrick Walton on analogies between browsers and the Unix kernel, JS and C.

The usual retort, recurrent on Hacker News, looks like this: Something about compilers rising, Java bytecode and asm.js, shared memory threads and SIMD. Perhaps you detect a theme, beyond вЂњJS turned 20вЂќ. My slides for the talk I gave at ModernWeb.tw on May 15th: Jeremy Ashkenas picked up this ball and ran into the next fieldвЂ™s end zone two days later in Brooklyn: My Fluent 2015 вЂњECMAScript Harmony: Rise of the CompilersвЂќ talk given on April 21st: Or just read Luke WagnerвЂs blog post right now. Tl dr IвЂ™m burying the lede with context and catch-up material first, so impatient or already-clued-in readers should skip to below the videos for todayвЂ™s big news.