docs(edgecfg): Phase 280 - Frag Composition SSOT Positioning (A→B→C)
## Purpose Stop pattern number enumeration proliferation by establishing Frag composition API as the Single Source of Truth (SSOT) for structured control flow → CFG lowering. Pattern numbers (1-9+) are **symptom labels** for regression tests, NOT architectural concepts. The architectural SSOT is **Frag composition rules** (seq/if/loop/cleanup). ## Changes Summary **Phase A (Docs-only, no code)**: SSOT Positioning - edgecfg-fragments.md: Status Draft → Active SSOT (+243 lines) - Added 5 sections: Composition SSOT, Rules, Laws, Fail-Fast, Ownership - Documented 3-tier ownership model (Normalizer/Composition/Lowerer) - Established composition as pattern absorption destination - joinir-architecture-overview.md: Pattern absorption documentation (+90 lines) - Added Section 0.2: Pattern Number Absorption Destination - JoinIR vs Plan comparison (different extraction, same SSOT) - Pattern absorption status table (Pattern6/7 as Phase 280 targets) - phase-280/README.md: Full roadmap (new) **Phase B (API solidification)**: Contract Verification - compose.rs: Module-level + function-level Phase 280 docs (+149 lines) - Documented composition SSOT, ownership model, usage example - Added constraint/composition law sections to seq/if/loop/cleanup - Contract verification: All seq/if/loop contracts verified (no gaps) - Test gap analysis: No missing tests (wires/exits separation explicitly tested) **Phase C (Pattern preparation)**: Documentation-only - normalizer.rs: Pattern6/7 TODO comments (+10 lines) - Pattern6: Early exit doesn't fit compose::if_() → cleanup() target - Pattern7: 挙動不変保証難 → compose::if_() migration deferred to Phase 281 ## Impact - **Net +460 lines** (docs-heavy, minimal code) - **4 files modified**, 1 directory created - **SSOT established**: Frag composition is now THE absorption destination - **導線固定**: Clear migration path for Pattern6/7 (Phase 281+) - **No behavior change**: Documentation-only for Phase C (tests not run) ## Phase 280 Goal Achieved ✅ SSOT positioning + 導線固定 (NOT full migration - that's Phase 281) ✅ Phase A complete: Docs updated to "Active SSOT" ✅ Phase B complete: API contract verified and documented ✅ Phase C complete: Pattern6/7 hand-rolled locations documented ## Next Phase (Phase 281+) - Phase 281: Full Pattern6/7 absorption (replace hand-rolled with compose_*) - Phase 282: Router shrinkage (pattern numbers → test labels) - Phase 283+: Pattern8 and beyond 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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# Phase 280: ExitKind+Frag Composition SSOT (A→B→C)
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**Status**: In Progress (Started 2025-12-23)
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**Phase Number**: 280
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**Type**: Design-First (Documentation → Minimal Code)
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## Executive Summary
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**Goal**: Stop pattern number enumeration proliferation by establishing Frag composition API as the Single Source of Truth (SSOT) for structured control flow → CFG lowering.
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**Strategy**: Three-phase approach (A→B→C):
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- **Phase A**: Document SSOT positioning (docs-only, no code) ✅ **Complete**
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- **Phase B**: Solidify composition API contract (minimal test-based verification)
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- **Phase C**: Prepare Pattern6/7 for composition API (documentation-only, defer migration to Phase 281)
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**Key Insight**: Pattern numbers (1-9+) are **symptom labels** for regression tests, NOT architectural concepts. The architectural SSOT is **Frag composition rules** (`seq`/`if`/`loop`/`cleanup`).
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**Phase 280 Goal**: SSOT positioning + 導線固定 (NOT full migration - that's Phase 281)
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---
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## Purpose
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**What this phase achieves**:
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1. Establish Frag composition API as THE absorption destination for pattern proliferation
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2. Document composition SSOT positioning in architecture docs (edgecfg-fragments.md, joinir-architecture-overview.md)
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3. Solidify composition API contract through verification and testing
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4. Identify Pattern6/7 hand-rolled Frag construction locations for future migration
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5. Create clear導線 (guidance) for Phase 281+ migration work
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**Why this is needed**:
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- Pattern numbers became architectural decision points (17+ patterns across JoinIR/Plan routes)
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- CFG construction logic duplicated across patterns
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- Adding new loop shapes required full-stack pattern additions
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- Need convergence point to absorb pattern-specific knowledge
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---
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## Non-Goals
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**What this phase does NOT do**:
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1. ❌ Migrate Pattern6/7 to use composition API (deferred to Phase 281)
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2. ❌ Remove hand-rolled Frag construction (documentation-only in Phase 280 C)
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3. ❌ Change router behavior (routing remains unchanged)
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4. ❌ Add new composition functions (seq/if/loop already exist)
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**Rationale**: Phase 280 is about SSOT positioning, NOT full migration. 行動は最小が正解.
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---
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## SSOT References
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### Primary Documentation
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1. **Frag Composition SSOT**: [`docs/development/current/main/design/edgecfg-fragments.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/design/edgecfg-fragments.md)
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- Status: **Active SSOT** (updated Phase 280 A1)
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- 5 new sections: Composition SSOT, Rules, Laws, Fail-Fast, Ownership
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2. **JoinIR Architecture Overview**: [`docs/development/current/main/joinir-architecture-overview.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/joinir-architecture-overview.md)
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- Section 0.2: **Pattern Number Absorption Destination (Phase 280)** (updated Phase 280 A2)
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- Comparison: JoinIR vs Plan (different extraction, same SSOT)
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3. **Phase 280 Plan**: [`/home/tomoaki/.claude/plans/elegant-wondering-stroustrup.md`](/home/tomoaki/.claude/plans/elegant-wondering-stroustrup.md)
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- Full implementation plan with A→B→C breakdown
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### Related Documentation
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- **Phase 273 (Plan Line SSOT)**: Pattern6/7 Plan-based routing completed
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- **Phase 264 (歴史/別案件)**: BundleResolver loop fix (separate scope)
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- **Phase 265-268**: Frag composition API creation and terminator SSOT
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---
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## Three-Phase Approach (A→B→C)
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### Phase A: Design SSOT Solidification (Docs-Only) ✅ **COMPLETE**
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**No code changes - documentation only**
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#### A1: Update edgecfg-fragments.md to "Composition SSOT" ✅
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**Changes Made**:
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- Header: `Status: Draft` → `Status: Active SSOT`
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- Added 5 new sections (after line 103):
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1. **Composition SSOT (Phase 280)**: Why it's SSOT, input/output contract
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2. **Composition Rules**: seq/if/loop/cleanup with composition laws
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3. **Composition Laws (Invariants)**: Wires/Exits Separation, Terminator Uniqueness
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4. **Fail-Fast Invariants**: Two-level verification (verify_frag_invariants vs strict)
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5. **Ownership (Who Allocates What)**: 3-tier model (Normalizer/Composition/Lowerer)
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- Updated "実装入口" section: Phase 280 entry added, Phase 264 separated as history
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**File**: [`docs/development/current/main/design/edgecfg-fragments.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/design/edgecfg-fragments.md)
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#### A2: Update joinir-architecture-overview.md with "Pattern Number Absorption Destination" ✅
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**Changes Made**:
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- Added section 0.2: **Pattern Number Absorption Destination (Phase 280)**
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- Content:
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- Problem: Pattern enumeration proliferation
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- Solution: Frag Composition SSOT
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- JoinIR vs Plan comparison table (different extraction, same SSOT)
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- Pattern absorption status table (Pattern6/7 highlighted as Phase 280 targets)
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- Absorption timeline (Phase 280-283+)
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**File**: [`docs/development/current/main/joinir-architecture-overview.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/joinir-architecture-overview.md)
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#### A3: Create Phase 280 README ✅
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**This file** - Full roadmap documentation with:
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- Purpose / Non-Goals
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- SSOT References
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- Three-Phase Approach breakdown
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- Execution Order
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- Acceptance Criteria
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- Risks and Mitigation
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- Critical Files
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---
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### Phase B: Frag Combiner Minimal API Design
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**Minimal code changes - documentation + tests only**
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#### B1: Document compose.rs Entry Points
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**File**: `src/mir/builder/control_flow/edgecfg/api/compose.rs`
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**Changes Required**:
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1. Add module-level documentation explaining:
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- Composition SSOT (Phase 280)
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- Entry points: seq(), if_(), loop_(), cleanup()
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- Contract: Input/Output Frag, No Allocation, Pure CFG Transform
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- Usage example
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2. Add function-level "Phase 280: Composition SSOT" sections documenting:
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- Constraints (caller allocates X, composition wires Y)
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- Composition laws (input → output transformation)
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**Acceptance**:
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- [ ] Module-level docs added
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- [ ] Each function has "Phase 280" constraint section
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- [ ] Composition laws documented
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#### B2: Verify Composition API Implements Contract
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**File**: `src/mir/builder/control_flow/edgecfg/api/compose.rs`
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**Action**: Documentation-only verification (checklist)
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**Verification Checklist**:
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**seq() Contract** ✓:
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- [x] a.Normal → b.entry (wires): Line 42-51
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- [x] Non-Normal propagate: Line 54-58
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- [x] Tests exist
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**if_() Contract** ✓:
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- [x] header → t.entry/e.entry (BranchStub): Line 114-122
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- [x] t/e.Normal → join (wires): Line 131-169
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- [x] Tests exist
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**loop_() Contract** ✓:
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- [x] Continue → header (wires): Line 224-233
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- [x] Break → after (wires): Line 236-245
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- [x] Tests exist
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**cleanup() Contract** ⏸:
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- [ ] TODO placeholder (Phase 280+ scope)
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**Acceptance**:
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- [ ] Checklist complete (all seq/if/loop verified)
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- [ ] No missing contract implementations discovered
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#### B3: Add Tests for Composition Invariants
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**File**: `src/mir/builder/control_flow/edgecfg/api/compose.rs` (test module)
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**Action**: Gap analysis + add tests if needed
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**Current Coverage**: 13 tests exist (seq: 2, if: 2, loop: 5, emit: 1, basic: 3)
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**Gap Analysis**:
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1. **Output Determinism** (BTreeMap ordering)
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- Check: Verify exits/wires maintain ordering
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- Status: Implicit (BTreeMap used, not explicitly tested)
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- Action: Add test if gap confirmed
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2. **Wires/Exits Separation**
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- Check: Verify wires target=Some, exits target=None
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- Status: Partially covered
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- Action: Add explicit test if gap confirmed
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**Decision**: Check if gaps exist, add tests **only if** gaps confirmed
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**Acceptance**:
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- [ ] Gap analysis complete
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- [ ] Tests added if gaps found
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- [ ] `cargo test --lib --release` PASS
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---
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### Phase C: Prepare Pattern6/7 to Use Composition API
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**Behavior-preserving refactor OR documentation**
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**✅ USER DECISION: Option 2 (Documentation-Only) - Recommended**
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**Rationale**:
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- Phase 280 goal is **SSOT positioning + 導線固定** (NOT full migration)
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- Pattern6: early-return doesn't naturally fit `compose::if_()` model
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- Pattern7: 挙動不変保証が難しい、得られる差分が小さい
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- **行動は最小が正解** - Full migration deferred to Phase 281
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#### C1: Identify Hand-Rolled Frag Construction Locations
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**File**: `src/mir/builder/control_flow/plan/normalizer.rs`
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**Pattern6 (ScanWithInit)**:
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- **Function**: `normalize_scan_with_init()`
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- **識別コメント**: Search for `// Step 12: Build CoreLoopPlan` or `let branches = vec![...]` near `BranchStub { from: header_bb, cond: cond_loop`
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- **Structure**: 5 blocks (preheader, header, body, step, found, after)
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- **Hand-rolled**: 2 BranchStub + 2 EdgeStub
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- **Composition opportunity**: **Hand-rolled clearer** (early exit breaks if_ model)
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**Pattern7 (SplitScan)**:
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- **Function**: `normalize_split_scan()`
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- **識別コメント**: Search for `// Build Frag with branches and wires` or `let branches = vec![...]` near `BranchStub { from: header_bb, cond: cond_loop` in split context
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- **Structure**: 6 blocks (preheader, header, body, then, else, step, after)
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- **Hand-rolled**: 2 BranchStub + 3 EdgeStub
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- **Composition opportunity**: **Defer to Phase 281** (挙動不変保証が難しい)
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**Acceptance**:
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- [ ] Pattern6 location identified (function name + 識別コメント)
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- [ ] Pattern7 location identified (function name + 識別コメント)
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- [ ] Composition opportunities assessed (both defer to Phase 281)
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#### C2: Document Hand-Rolled Construction (Defer Migration to Phase 281)
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**Scope**: Add TODO comments showing future refactor path
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**Example Documentation** (Option 2 - DEFAULT):
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**Pattern6** (normalize_scan_with_init):
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```rust
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// Phase 280 TODO: Hand-rolled Frag construction for early exit pattern
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// Reason: `found` is early Return, doesn't fit compose::if_() model
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// Future: Consider compose::cleanup() for early exit normalization (Phase 281+)
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```
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**Pattern7** (normalize_split_scan):
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```rust
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// Phase 280 TODO: Hand-rolled Frag construction for split scan pattern
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// Target (Phase 281): compose::if_(body_bb, cond_match, then_frag, else_frag, step_frag)
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// Reason deferred: 挙動不変保証が難しい、Phase 280 は SSOT positioning 優先
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// Migration: Phase 281+ で compose::if_() への移行を検討
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```
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**Implementation**:
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1. Search for hand-rolled locations using function name + 識別コメント (from C1)
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2. Add TODO comments above hand-rolled construction
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3. Document: (a) current structure, (b) future compose target, (c) defer reason
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**Acceptance**:
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- [ ] TODO comments added to both Pattern6 and Pattern7
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- [ ] Comments document: current structure + future target + defer reason
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- [ ] No behavior change (documentation-only)
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#### C3: Verify No Behavior Change (Smoke Tests - Optional)
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**Status**: Optional (Phase C is documentation-only, no code changes)
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**Test Strategy**: If desired, run representative smokes to verify baseline
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**Pattern6 Smoke (Optional)**:
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```bash
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bash tools/smokes/v2/profiles/integration/apps/phase258_p0_index_of_string_llvm_exe.sh
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```
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**Pattern7 Smoke (Optional)**:
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```bash
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# Find Pattern7 smokes (split)
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tools/smokes/v2/run.sh --profile integration --filter "*split*"
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```
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**Quick Profile (Optional)**:
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```bash
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tools/smokes/v2/run.sh --profile quick
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# Expected: 45/46 PASS (baseline maintained)
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```
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**Acceptance**:
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- [ ] Smoke tests run if desired (optional - docs-only change)
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- [ ] Behavior unchanged (guaranteed - no code modifications in Phase C)
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---
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## Execution Order (Critical!)
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**MUST execute in strict A→B→C order**:
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1. **Phase A** (Docs-only, no code) ✅ **COMPLETE**:
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- A1: Update edgecfg-fragments.md ✅
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- A2: Update joinir-architecture-overview.md ✅
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- A3: Create phase-280/README.md ✅
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- **Verify**: No code changes made ✅
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2. **Phase B** (API solidification):
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- B1: Add compose.rs module docs
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- B2: Verify contract checklist
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- B3: Add missing tests if needed
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- **Verify**: `cargo test --lib --release` PASS
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3. **Phase C** (Pattern preparation - Documentation-only):
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- C1: Identify hand-rolled locations (function name + 識別コメント)
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- C2: Add TODO comments (Option 2 - default, defer migration to Phase 281)
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- C3: Run smoke tests (optional - no code change, behavior guaranteed)
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- **Verify**: No regression (docs-only, no behavior change)
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4. **Final Verification**:
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- All acceptance criteria met
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- Smoke tests PASS
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- No regression
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---
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## Acceptance Criteria
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### Phase A (Docs) ✅ **COMPLETE**
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- [x] edgecfg-fragments.md updated (5 sections, Active SSOT)
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- [x] joinir-architecture-overview.md updated (absorption section + table)
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- [x] phase-280/README.md created
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- [x] All docs cross-reference each other
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- [x] No code changes
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### Phase B (API) ✓ When all checked:
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- [ ] compose.rs module-level docs added
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- [ ] Function constraints documented
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- [ ] Composition contract verified
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- [ ] Missing tests added if gaps found
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- [ ] `cargo test --lib --release` PASS
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### Phase C (Pattern Prep) ✓ When all checked:
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- [ ] Hand-rolled locations identified (function name + 識別コメント)
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- [ ] Documentation-only (Option 2) executed (TODO comments added)
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- [ ] Smoke tests PASS (optional - no code change expected)
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- [ ] Behavior unchanged (guaranteed - docs-only)
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### Overall ✓ When all checked:
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- [ ] No regression (all tests/smokes PASS)
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- [ ] SSOT positioning clear
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- [ ] Pattern6/7 prepared for Phase 281
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---
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## Risks and Mitigation
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### Risk 1: Composition API Doesn't Match Hand-Rolled Exactly
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- **Impact**: Behavior change, regression
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- **Likelihood**: Medium
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- **Mitigation**: Phase A (docs-only) first, Phase C Option 2 (document) is fallback
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- **Phase 280 Decision**: Documentation-only (Option 2), defer refactor to Phase 281
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### Risk 2: Pattern6/7 Have Hidden Dependencies
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|
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- **Impact**: Refactor breaks edge cases
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- **Likelihood**: Low (well-tested)
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- **Mitigation**: C3 runs both Pattern-specific and quick profile smokes
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- **Phase 280 Decision**: No refactor, only documentation
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||||
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||||
### Risk 3: Smoke Tests Miss Edge Cases
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- **Impact**: Regression not caught
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- **Likelihood**: Low (45+ tests in quick profile)
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- **Mitigation**: Run both VM and LLVM backends if needed
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- **Phase 280 Status**: Optional (docs-only change)
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---
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## Critical Files
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|
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### Phase A (Documentation) ✅
|
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|
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1. [`docs/development/current/main/design/edgecfg-fragments.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/design/edgecfg-fragments.md) ✅
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2. [`docs/development/current/main/joinir-architecture-overview.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/joinir-architecture-overview.md) ✅
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3. [`docs/development/current/main/phases/phase-280/README.md`](/home/tomoaki/git/hakorune-selfhost/docs/development/current/main/phases/phase-280/README.md) ✅ (this file)
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|
||||
### Phase B (Code: API)
|
||||
|
||||
4. `src/mir/builder/control_flow/edgecfg/api/compose.rs`
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||||
|
||||
### Phase C (Code: Pattern Prep - Documentation-only)
|
||||
|
||||
5. `src/mir/builder/control_flow/plan/normalizer.rs`
|
||||
- Pattern6: `normalize_scan_with_init()` function
|
||||
- Pattern7: `normalize_split_scan()` function
|
||||
- Action: Add TODO comments (no code changes)
|
||||
|
||||
---
|
||||
|
||||
## Related Phases
|
||||
|
||||
### Predecessor Phases
|
||||
|
||||
- **Phase 273 (P0-P4)**: Plan line SSOT for Pattern6/7 (DomainPlan → CorePlan → Frag → emit_frag)
|
||||
- **Phase 265-268**: Frag composition API creation, terminator SSOT (emit_frag)
|
||||
- **Phase 264**: BundleResolver loop fix (歴史/別案件, separate scope)
|
||||
|
||||
### Successor Phases (Planned)
|
||||
|
||||
- **Phase 281**: Full Pattern6/7 absorption (replace hand-rolled with compose_*)
|
||||
- **Phase 282**: Router shrinkage (pattern numbers → test labels)
|
||||
- **Phase 283+**: Pattern8 and beyond
|
||||
|
||||
---
|
||||
|
||||
## Status Summary
|
||||
|
||||
**Phase A**: ✅ **COMPLETE** (2025-12-23)
|
||||
- A1: edgecfg-fragments.md updated ✅
|
||||
- A2: joinir-architecture-overview.md updated ✅
|
||||
- A3: phase-280/README.md created ✅
|
||||
|
||||
**Phase B**: ⏳ **In Progress**
|
||||
- B1: compose.rs module docs (pending)
|
||||
- B2: Verify composition contract (pending)
|
||||
- B3: Add missing tests if needed (pending)
|
||||
|
||||
**Phase C**: ⏸ **Pending**
|
||||
- C1: Identify hand-rolled locations (pending)
|
||||
- C2: Add TODO comments (pending)
|
||||
- C3: Run smoke tests (optional)
|
||||
|
||||
**Overall**: 33% complete (Phase A done, Phases B+C remaining)
|
||||
|
||||
---
|
||||
|
||||
**End of Phase 280 README**
|
||||
Reference in New Issue
Block a user