lyng/notes/bytecode_callsite_cache.md

Bytecode method call-site cache

Changes

• Added per-thread bytecode method call-site caches via BytecodeCallSiteCache expect/actuals.
• Bytecode VM now reuses per-function call-site maps to preserve method PIC hits across repeated bytecode executions.
• Removed unused methodCallSites property from BytecodeFunction.

Why

• Fixes JVM PIC invalidation test by allowing method PIC hits when bytecode bodies are invoked repeatedly (e.g., loop bodies compiled to bytecode statements).
• Avoids cross-thread mutable map sharing on native by using thread-local storage.

Tests

• ./gradlew :lynglib:jvmTest
• ./gradlew :lynglib:allTests -x :lynglib:jvmTest

Benchmark

• ./gradlew :lynglib:jvmTest --tests NestedRangeBenchmarkTest -Dbenchmarks=true
  • nested-happy elapsed=1266 ms