Files
hakorune/docs/development/current/main
nyash-codex 350dba92b4 feat(joinir): Phase 193-4 - Exit Binding Builder implementation
Implemented fully boxified exit binding generation for Pattern 3 & 4.
Eliminates hardcoded variable names and ValueId assumptions.

**New files**:
- docs/development/current/main/phase193_exit_binding_builder.md: Design document
- src/mir/builder/control_flow/joinir/patterns/exit_binding.rs: ExitBindingBuilder implementation (400+ lines)

**Key components**:
- LoopExitBinding: Maps JoinIR exit values to host function variables
- ExitBindingBuilder: Generates bindings from CarrierInfo + ExitMeta
- Comprehensive validation:
  - Carrier name mismatch detection
  - Missing carrier detection
  - Loop variable incorrectly in exit_values
- Builder methods:
  - new(): Create builder with metadata validation
  - build_loop_exit_bindings(): Generate bindings, update variable_map
  - apply_to_boundary(): Set JoinInlineBoundary host/join_outputs
  - loop_var_exit_binding(): Get loop variable exit binding
- Unit tests: 6 test cases covering single/multi-carrier and error scenarios

**Features**:
- Supports both single and multi-carrier loop patterns
- Automatic post-loop ValueId allocation for carriers
- Sorted carrier processing for determinism
- Full integration with CarrierInfo and ExitMeta from Phase 193-2

**Status**: Phase 193-4 implementation complete. Ready for Phase 193-5 integration.

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

Co-Authored-By: Claude <noreply@anthropic.com>
2025-12-06 11:09:03 +09:00
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