Crate rune_compile 

rune compile back-end — background compilation and transparent hot-swap.

Architecture:

• CompileQueue: background thread pool for compilation jobs
• ArtifactCache: source-hash → compiled artifact mapping
• TierRouter: per-call-site tier (interpret | compile | compiled)
• hot-swap: when compile finishes, next call uses compiled path

The interpreter is always the fallback. Compilation is opportunistic. Instant start is always preserved — compilation never blocks execution.

Structs

ArtifactCache

The artifact cache — maps source hash to compiled artifact.

CallCounter

Call counter per formula hash — tracks hot paths.

CompiledArtifact

A compiled artifact — the result of optimizing a Nox formula. In M6, this is the same Noun (no actual optimization yet). In future milestones: TIR-optimized .nox bytecode.

TierRouter

TierRouter — makes the call-tier decision.

TierStats

Stats snapshot returned by TierRouter::stats.

Enums

Tier

Per-callsite execution tier.

Functions

compile_formula

Compile a formula. In M6 this is the trident path stub. Returns an artifact immediately (background thread in M8+).

formula_hash

A simple formula hash — placeholder until hemera lands in M2.

try_trident_compile

Attempt to compile a pure rune formula through trident. Returns Some(artifact) if compilation succeeded, None if formula contains dynamic forms (hint/host/eval) that trident cannot accept.