JIT Compilation Skill
Overview
Expert skill for just-in-time compilation including profiling, tiered compilation, and deoptimization.
Capabilities
- Implement execution profiling and hot path detection
- Design tiered compilation strategies (baseline + optimizing)
- Implement on-stack replacement (OSR)
- Implement speculative optimizations with guards
- Design deoptimization frame reconstruction
- Implement inline caching and type feedback
- Design code cache management and eviction
- Implement method inlining heuristics
Target Processes
- jit-compiler-development.js
- bytecode-vm-implementation.js
- interpreter-implementation.js
Dependencies
V8/HotSpot architecture references
Usage Guidelines
- Tiered Approach: Start with a baseline tier, add optimizing tier when profiling data is available
- Profile-Guided: Use profiling data to guide optimization decisions
- Speculation: Implement guards for speculative optimizations with clean deoptimization
- OSR: Implement OSR for long-running loops to benefit from optimization mid-execution
- Code Cache: Implement code cache management to handle memory pressure
Output Schema
{
"type": "object",
"properties": {
"tiers": {
"type": "array",
"items": {
"type": "object",
"properties": {
"name": { "type": "string" },
"trigger": { "type": "string" }
}
}
},
"profilingMethod": {
"type": "string",
"enum": ["counters", "sampling", "tracing"]
},
"osrSupport": { "type": "boolean" },
"generatedFiles": {
"type": "array",
"items": { "type": "string" }
}
}
}