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The Mysterious Realm of JavaScriptCore (2021)

• epolanski 10mo ago
  I've often thought about the possibility of implementing a language that can compile directly to optimized byte code (either for V8 or JSC), in order to get "hot code" that does not need runtime optimization, has anybody explored this idea?
  • pizlonator 10mo ago
    That won't work for JS because you need runtime profiling to be able to do any meaningful optimizations
  • astrange 10mo ago
    That's WebAssembly / asm.js. Well, that's the target, you could still design a language for it.
• gsf_emergency_6 10mo ago
  Author's talk from around that time (Apr 2021) https://youtu.be/7qyKZOjhg94 https://youtu.be/7qyKZOjhg94 [Finding] JS bugs in JSC with CodeQL
• N_Lens 10mo ago
  Author used CodeQL to rediscover a CVE in JSC that was exploited by Pwn2Own in 2018. Very interesting. I guess now with increasing automation we'll see more CVE discovery through such tools.
• pizlonator 10mo ago
  A lot more details here: https://webkit.org/blog/10308/speculation-in-javascriptcore/ https://webkit.org/blog/10308/speculation-in-javascriptcore/