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nyash-codex 7dfd6ff1d9 feat(llvm): Phase 131-11-H/12 - ループキャリアPHI型修正 & vmap snapshot SSOT

## Phase 131-11-H: ループキャリアPHI型修正
- PHI生成時に初期値（entry block）の型のみ使用
- backedge の値を型推論に使わない（循環依存回避）
- NYASH_CARRIER_PHI_DEBUG=1 でトレース

## Phase 131-12-P0: def_blocks 登録 & STRICT エラー化
- safe_vmap_write() で PHI 上書き保護
- resolver miss を STRICT でエラー化（フォールバック 0 禁止）
- def_blocks 自動登録

## Phase 131-12-P1: vmap_cur スナップショット実装
- DeferredTerminator 構造体（block, term_ops, vmap_snapshot）
- Pass A で vmap_cur をスナップショット
- Pass C でスナップショット復元（try-finally）
- STRICT モード assert

## 結果
- ✅ MIR PHI型: Integer（正しい）
- ✅ VM: Result: 3
- ✅ vmap snapshot 機構: 動作確認
- ⚠️ LLVM: Result: 0（別のバグ、次Phase で調査）

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

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

2025-12-14 21:28:41 +09:00

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Investigations Folder

This folder contains investigation notes and analysis for debugging sessions.

Active Investigations

Phase 131-12: LLVM Wrong Result (Case C)

Status: ✅ Root cause identified Problem: LLVM backend returns wrong results for loop exit values Root Cause: vmap object identity mismatch between Pass A and Pass C

Key Documents:

phase131-12-case-c-llvm-wrong-result.md - Initial investigation scope
phase131-12-p1-vmap-identity-analysis.md - Detailed trace analysis
phase131-12-p1-trace-summary.md - Executive summary with fix recommendations

Quick Summary:

Bug: Pass A deletes _current_vmap before Pass C runs
Impact: Terminators use wrong vmap object, missing all Pass A writes
Fix: Store vmap_cur in deferred_terminators tuple (Option 3)

Next Steps:

Implement Option 3 fix in block_lower.py
Add Fail-Fast check in instruction_lower.py
Verify with NYASH_LLVM_VMAP_TRACE=1
Run full test suite

Trace Environment Variables

Phase 131-12-P1 Traces

NYASH_LLVM_VMAP_TRACE=1    # Object identity and vmap keys tracing
NYASH_LLVM_USE_HARNESS=1   # Enable llvmlite harness
NYASH_LLVM_DUMP_IR=<path>  # Save LLVM IR to file

Investigation Workflow

Scope - Define problem and test case (phase131-12-case-c-*.md)
Trace - Add instrumentation and collect data (phase131-12-p1-vmap-identity-*.md)
Analysis - Identify root cause with evidence (phase131-12-p1-trace-summary.md)
Fix - Implement solution with validation
Document - Update investigation notes with results

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