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nyash-codex 7b56a7c01d docs(joinir): Phase 70-A - Relay Runtime Guard (dev-only)

Phase 66で analysis/plan層はmultihop受理可能になったが、runtime lowering
(実行導線)はまだ未対応。このPhaseでは「未対応は同じタグで必ず落ちる」を
docs + テストで固定する。

Key changes:
- phase70-relay-runtime-guard.md: Runtime guard設計doc新規追加
  - 現状(plan OK / runtime NG)の明確化
  - Fail-Fastタグ [ownership/relay:runtime_unsupported] の標準化
  - Phase 70-B以降の解除条件

- pattern3_with_if_phi.rs: エラーメッセージのタグ統一
  - [ownership/relay:runtime_unsupported] 形式に変更
  - var/owner_scope/relay_path の診断情報追加

- normalized_joinir_min.rs: 固定テスト追加
  - test_phase70a_multihop_relay_runtime_unsupported_tag
  - Plan層のmultihop受理確認 + runtime拒否の文書化

Tests: normalized_dev 50/50 PASS (+1), lib 950/950 PASS

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-13 02:22:29 +09:00

2.4 KiB

Raw Blame History

Phase 70-A: Relay Runtime Guard

Status: Implementation Phase Date: 2025-12-13

Overview

Phase 66 enabled multihop relay acceptance at the analysis/plan layer (plan_to_p2_inputs_with_relay / plan_to_p3_inputs_with_relay). However, the runtime lowering path (actual MIR generation) does not yet support multihop execution.

This phase establishes a Fail-Fast boundary with a standardized error tag to clearly indicate "analysis OK, runtime not yet supported."

Current State

Layer	Multihop Support	Status
`plan_to_p2_inputs_with_relay`	✅ Accepts	Phase 66 complete
`plan_to_p3_inputs_with_relay`	✅ Accepts	Phase 66 complete
P3 runtime lowering	❌ Rejects	Phase 70-A guard
P2 runtime lowering	❌ Not integrated	Future

Fail-Fast Tag

Standard Tag: [ownership/relay:runtime_unsupported]

When multihop relay (relay_path.len() > 1) is detected at runtime:

[ownership/relay:runtime_unsupported] Multihop relay not executable yet: var='sum', owner=ScopeId(0), relay_path=[ScopeId(2), ScopeId(1)]

Diagnostic fields:

Variable name being relayed
Owner scope ID
Relay path (inner → outer)
Relay path length

Implementation Location

File: src/mir/builder/control_flow/joinir/patterns/pattern3_with_if_phi.rs

Function: check_ownership_plan_consistency()

Behavior: On relay_path.len() > 1, return Err with standardized tag.

Release Conditions (Phase 70-B+)

The [ownership/relay:runtime_unsupported] guard can be removed when:

Exit PHI merge implemented at owner scope
Boundary carrier propagation for intermediate scopes
Integration tests passing for 3+ layer nested loops
No regression in existing Pattern3 tests

Test Coverage

Test: test_phase70a_multihop_relay_runtime_unsupported_tag

Verifies:

3-layer nested loop AST (L1 owns sum, L3 writes sum)
Runtime path returns Err
Error message contains [ownership/relay:runtime_unsupported]

Changelog

2025-12-13: Phase 70-A created - Fail-Fast tag standardization

2.4 KiB Raw Blame History