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Web Assembly
Web Assembly (Wasm) is a new format for running compiled code on the web. It aims to provide better performance than JavaScript by allowing code written in languages like C/C++ to run in the browser as fast native code. Wasm modules define functions, memory, and other objects and can be compiled to a small size and load quickly. It features a portable binary format and JavaScript integration, allowing compiled code to interface with web APIs and DOM. Wasm pursues goals of portability, security, and integration with web standards to enhance browser performance without plugins.
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Web Assembly
- 1. Web Assembly A lightweightintroduction
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- 3. Outline ● What isWA ● Why WA ● Chasing performance ● Feature ● Demo ● The future ● Q&A
- 5. What is WebAssembly?
- 6. WebAssembly, or wasm,is a new portable, size- and load-time-efficient format suitable for compilation to the web.
- 8. It’s a virtualmachine for the web!
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- 11. ● Freedom tochoose a different language ○ Run CC++ codebase in a browser ● Performance ○ Dynamic Typed language ○ engine optimization ○ JS bottlneck Why WA
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- 13. ● engine ○ parsesource ○ create AST ○ create machine code ● code optimization - turboFan ○ looking for slow function ○ optimization ○ code analisys is CPU intensive Chasing performance - Javascript
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- 15. function add(a, b){ return a + b; }
- 16. Javascript addition operatorsemantic
- 17. Javascript addition operatorsemantic
- 18. Javascript addition operatorsemantic
- 19. Javascript addition operatorsemantic
- 20. Javascript addition operatorsemantic
- 21. ● plugins ○ Flash ○Java ● Google Native Client (NaCl) ○ Open Source ○ Run native code in a sandbox ● asm.js ○ compiler target ○ c++ to Javascript (subset) fast native code ○ different performance over different engine Chasing performance
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- 23. Feature - Goal ●Portable ● Extendible ● Integrated with Web Standard ● Using existing tools
- 24. Feature ● Compile target ●Internal browser VM ● Cross browser support ● Javascript API ● Version 1 (MVP)
- 25. Module: distributable, loadable, andexecutable unit of code
- 26. Feature - Module ●import ● export ● start ● global ● memory ● data ● table ● elements ● functions
- 27. Feature - Module ●index spaces ○ function ○ table ○ global ○ linear memory
- 28. Feature - Module ●Binary encoding ○ Efficient and fast ○ Stack based VM ○ Native speed ● Text format ○ LISP like
- 29. Feature - JavascriptAPI ● Integrated with Web Platform ○ WebAPIs via JS ○ JS interoperability
- 31. Feature - Type ●types ○ void ○ i32 ○ i64 ○ f32 ○ f64
- 32. Feature - Memory ●linear memory ○ untyped array of bytes ○ 64KiB page size ● grow_memory operator
- 33. Feature - Memory ●operators ○ load ○ store ● effective address ○ sum of address operand and an offset operand ● out-of-bound check ○ out-of-bound trap
- 34. Feature - Security ●sandbox ○ using only API ● security policies of its embedding ● function declared at load time
- 35. Feature - Security ●control flow integrity (CFI) ○ Function call ○ Indirect function call ○ returns ● By design
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- 37. It’s time fora demo!
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- 41. ● Garbage collector ○Support new languages ● Multithread support ● wasm64 ● Exception handling What’s next?
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- 44. References ● http://www.webassemly.org ● https://en.wikipedia.org/wiki/Type_system ●http://webassembly.org/docs/semantics/ ● http://webassembly.org/docs/modules/ ● http://webassembly.org/docs/mvp/ ● http://webassembly.org/docs/future-features/ ● https://youtu.be/6v4E6oksar0 ● https://youtu.be/DKHuEkmsx3M
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