# Phase 64 Summary: Ownership P3 Production Integration (dev-only)

## Goal

Connect OwnershipPlan analysis to production P3(if-sum) route for dev-only validation.

## Changes

### 1. `ast_analyzer.rs`: Added `analyze_loop()` helper

- **Purpose**: Analyze a single loop (condition + body) with parent context
- **Signature**: `analyze_loop(condition, body, parent_defined) -> Result<OwnershipPlan>`
- **Usage**: Called from P3 production route in `pattern3_with_if_phi.rs`
- **Features**:
  - Creates temporary function scope for parent-defined variables
  - Analyzes loop scope with condition/body AST
  - Returns OwnershipPlan for loop scope only

### 2. `pattern3_with_if_phi.rs`: Added dev-only OwnershipPlan call + consistency checks

- **Location**: Inside `lower_pattern3_if_sum()` method, after ConditionEnv building
- **Feature gate**: `#[cfg(feature = "normalized_dev")]`
- **Workflow**:
  1. Collect parent-defined variables from `variable_map`
  2. Call `analyze_loop()` to produce OwnershipPlan
  3. Run `check_ownership_plan_consistency()` checks
  4. Continue with existing lowering (analysis-only, no behavior change)

### 3. Consistency checks (`check_ownership_plan_consistency()`)

#### Check 1: Multi-hop relay rejection (Fail-Fast)
- **What**: `relay_path.len() > 1` → Err
- **Why**: Multi-hop relay is out of scope for Phase 64
- **Action**: Return error immediately (Fail-Fast principle)

#### Check 2: Carrier set consistency (warn-only)
- **What**: Compare `plan.owned_vars` (written) vs `carrier_info.carriers`
- **Why**: Verify OwnershipPlan matches existing CarrierInfo
- **Action**: Warn if mismatch (order SSOT deferred to Phase 65+)

#### Check 3: Condition captures consistency (warn-only)
- **What**: Verify `plan.condition_captures` ⊆ `condition_bindings`
- **Why**: Ensure OwnershipPlan condition captures are tracked
- **Action**: Warn if extra captures found

### 4. Regression tests (`normalized_joinir_min.rs`)

#### Test 1: `test_phase64_p3_ownership_prod_integration()`
- **Purpose**: Verify `analyze_loop()` works for simple P3 loops
- **Pattern**: `loop(i < 10) { local sum=0; sum=sum+i; i=i+1; }`
- **Checks**:
  - Owned vars: sum (is_written=true), i (is_written=true, is_condition_only=true)
  - No relay writes (all loop-local)
  - Single-hop relay constraint verified

#### Test 2: `test_phase64_p3_multihop_relay_rejection()`
- **Purpose**: Verify multi-hop relay detection
- **Pattern**: Nested loops with relay write to function-scoped variable
- **Checks**:
  - Detects multi-hop relay (`relay_path.len() > 1`)
  - Documents that rejection happens in consistency check (not analyze_loop)

## Constraints

- **Dev-only**: `#[cfg(feature = "normalized_dev")]` throughout
- **Analysis-only**: No behavior change to lowering
- **Fail-Fast**: Multi-hop relay (`relay_path.len() > 1`)
- **Warn-only**: Carrier set mismatch (order SSOT deferred)

## Build and Test

```bash
# Build with normalized_dev feature
cargo build --release --features normalized_dev

# Run Phase 64 tests
cargo test --features normalized_dev --test normalized_joinir_min phase64

# Run ownership module tests
cargo test --features normalized_dev --lib ownership
```

Expected: All tests pass, no regressions.

## Next Steps

### Phase 65+: Future Enhancements

1. **Multi-hop relay support**: Remove `relay_path.len() > 1` limitation
2. **Carrier order SSOT**: Use OwnershipPlan to determine carrier order (upgrade warn to error)
3. **Owner-based init**: Replace legacy `FromHost` with owner-based initialization
4. **Full AST coverage**: Extend `analyze_loop()` to handle more complex patterns

## Related Documents

- [Phase 62: Ownership P3 Route Design](phase62-ownership-p3-route-design.md)
- [Phase 63: AST Ownership Analyzer](../../../private/roadmap2/phases/normalized_dev/phase-63-ast-ownership-analyzer.md)
- [JoinIR Architecture Overview](joinir-architecture-overview.md)