hakorune/lang/src/mir/builder

MirBuilderBox — Program(JSON v0) → MIR(JSON v0)

Responsibility

• Convert Stage‑B Program(JSON v0) into MIR(JSON v0) for VM/LLVM lines.
• Phase 20.34 starts with a delegate implementation to Runner and progressively internalizes ops.

Interface (stable)

• emit_from_program_json_v0(program_json: String, opts: Map|Null) -> String|Null
  • Returns canonical MIR(JSON v0) on success; returns null and prints a tagged diagnostic on failure.

Tags (Fail‑Fast, stable)

• [mirbuilder/input/null] — input is null
• [mirbuilder/input/invalid] — header missing (version/kind)
• [mirbuilder/delegate] — delegate path selected (Runner --program-json-to-mir)
• [mirbuilder/delegate/missing] — delegate/provider not wired yet

Toggles (default OFF)

• HAKO_MIR_BUILDER_DELEGATE=1: Use Runner --program-json-to-mir as a temporary provider

Notes

• Box‑First policy: boundary/contract first, then implementation. Keep tags stable; no silent fallback.
• Large payloads: implementation may stream/json-scan later; initial version is string‑based.