Javascript:SpiderMonkey:BaselineCompiler

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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" (bug 804676 RESOLVED FIXED)
  • Remove ScriptAnalysis::analyzeTypes (for real this time): bug 864928

• (DONE?) 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 (mostly done, except SetProp_NativeAdd)
  • Inline SetProp_NativeAdd operations using Baseline ICs.
  • Inline polymorphic, shape-guarded GetProp and SetProp operations using Baseline ICs.

• Compile more ops with baseline:
  • ES6 rest parameters: bug 867471
  • Remaining ops are |with| and other slow/rare stuff

• Optimize new ES6 features
  • Proxies
  • ES6 Generators: bug 903457

• Add support for try/finally (bug 866878 RESOLVED FIXED)

• Enable toggling debugger with code on the stack: bug 716647
  • Will require implementation of OST - on-stack transformation of jitcode
  • OST also enables removing profiler instrumentation from default jitcode