Outlining: a workaround for JITs and big functions
Just In Time (JIT) compilers, like JavaScript engines, receive source code and compile it at runtime. That means that end users can notice how long things take to compile, and avoiding noticeable compilation pauses is important. But JavaScript engines and other modern JITs perform optimizations whose complexity is worse than linear, for example SSA analysis and register allocation. That means that
The Baseline Compiler Has Landed
This wednesday we landed the baseline compiler on Firefox nightly. After six months of work from start to finish, we are finally able to merge the fruits of our toils into the main release stream. What Is The Baseline Compiler? Baseline (no, there is no *Monkey codename for this one) is IonMonkey’s new warm-up compiler. It brings performance improvements in the short term, and opportunities for ne
677272 - (JITHardening) JIT hardening
Chris Rolph and Yan Ivnitskiy from Matasano have been discussing JIT spray mitigations with us. Quoting Blazakis, 2010: "JIT spraying is the process of coercing the JIT engine to write many executable pages with embedded shellcode." There are a number of patches and performance results drafted up that implement the following laundry-list of mitigation techniques, as enumerated in their black hat p
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