Javascript:SpiderMonkey:BaselineCompiler

General Plan

Landing

Land with basic functionality to make Firefox 23. This means making it into mozilla-inbound before May 13, 2013.

Current ETA: make it into mozilla-inbound by end of first week of April, 2013.

Requirements:

• Performance
  • Be on par or better than trunk Interp+JM+Ion on:
    • Kraken
    • Sunspider
    • Octane
    • Dromaeo
• Memory
  • Do not regress memory as compared to trunk
• Features
  • Support try/catch
  • Support debugger integration
  • Support profiler integration

Post Landing

• Remove persistent bytecode analysis (scriptAnalysis) on both Ion and Baseline
  • High priority.
  • Will reduce memory usage greatly.
  • Removal enables Brian Hackett's "rm analyzeTypes"
    • See: https://bugzilla.mozilla.org/show_bug.cgi?id=804676

• Fix Octane performance issues.
  • Overall scores on Octane are better than Interp+JM+Ion
  • Some octane benches show perf-instability on AWFY (some runs are really slow)
    • Box2D
    • CodeLoad
    • GameBoy
    • PdfJS
  • Individual benchmarks which are slower than Interp+JM+Ion
    • DeltaBlue
    • Richards
    • Splay

• Integrate Ion and Baseline further
  • Inline SetProp_NativeAdd operations using Baseline ICs.
  • Inline polymorphic, shape-guarded GetProp and SetProp operations using Baseline ICs.

• Compile more ops with baseline (e.g. ES6 reset parameters)

• Optimize new ES6 features
  • Proxies
  • Generators

• Add support for try/finally

• Enable toggling debugger with code on the stack
  • Will require implementation of OST - on-stack transformation of jitcode
  • OST also enables removing profiler instrumentation from default jitcode