hakorune/examples/jit_policy_whitelist_demo.hako

// JitPolicy whitelist demo with DebugConfigBox event setup.
// Goal: show fallback on read_only, then allow after whitelist.
// Run (Cranelift enabled recommended):
//   cargo build --release -j32 --features cranelift-jit
//   NYASH_JIT_HOSTCALL=1 ./target/release/nyash --backend vm examples/jit_policy_whitelist_demo.hako
// Check events file:
//   cat policy_events.jsonl  # contains phase=lower/execute decisions

box Helper {
  birth() {}
  add(a) {
    a.push(1)
    return a.length()
  }
}

static box Main {
  main() {
    // Enable compile-time events and output path via DebugConfigBox
    local D
    D = new DebugConfigBox()
    D = D.setFlag("jit_events_compile", true)
    D = D.setFlag("jit_events_runtime", true)
    D = D.setPath("jit_events_path", "policy_events.jsonl")
    D.apply()

    // Prepare JIT policy: read_only first
    local P
    P = new JitPolicyBox()
    P.set("read_only", true)

    // Prepare data and helper
    local H, A
    H = new Helper()
    A = new ArrayBox()

    // 1st call: should fallback by policy (mutating denied)
    H.add(A)

    // Whitelist push_h and retry (expect allow)
    P.addWhitelist("nyash.array.push_h")
    return H.add(A)
  }
}