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Assembly thy Web
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- 2. Martin Ockajak fromZürich Software Engineer @martin_ockajak
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- 5. What is WebAssembly ● Virtualinstruction set architecture ● Bytecode for the web browser ● Backed by major browser vendors ● Formats ● Text (Assembly Language) ● Binary (Virtual Machine Code) ● Evolved from its predecessors ● Java Applets, ActiveX, PNaCl, asm.js & Emscripten @ LLVM
- 6. How does itwork
- 7. Source languages ● C /C++ ● LLVM, Emscripten, Binaryen & WABT ● Objective-C ? ● Swift ? ● Rust ?
- 8. Benefits ● Close to nativeperformance ● Small application size ● Quick decoding (20x faster) ● Portability ● Security
- 9. Use cases ● Image &video processing ● Virtual & augmented reality ● Simulation & visualization ● Development tools ● Games
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- 12. Instruction set ● Integer andfloating point data types ● Basic constructs ● Blocks ● Typed functions ● Calls ● Conditionals ● Loops ● Type checking for direct & indirect calls ● Similar to JVM bytecode or CIL
- 13. Memory model ● Sandboxed linearmemory ● Can be grown programatically ● Indexed tables ● Typed elements ● Indexed local & global variables ● Mutable or immutable
- 14. Dynamic linking ● Modules ● Distributable unitsof code ● Imports & exports ● Module & object name ● Integration with ES6 modules
- 15. Security ● Indexed function calls& variables ● Branch target validation ● Shadow stack ● Invalid address causes an exception ● Same origin policy & CORS
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- 17. High-level features ● Garbage collection ● Zero-costexceptions ● Threads & processes ● Tail-call optimization ● Source maps ● Potential source languages ● Haskell, Scala, Python, Java, Go
- 18. Additional features ● DOM &Web APIs access ● Streaming compilation ● Just-in-time compilation ● SIMD instructions ● Coroutines
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