Task 176-1: Pattern2 limitation investigation
- Identified 10 limitation points where only position carrier was handled
- Added TODO markers for Phase 176-2/3 implementation
- Created phase176-pattern2-limitations.md documentation
Task 176-2: CarrierUpdateLowerer helper implementation
- Implemented emit_carrier_update() helper function
- Supports CounterLike and AccumulationLike UpdateExpr patterns
- Added 6 unit tests (all passing)
- Fail-Fast error handling for carrier/variable not found
Task 176-3: Pattern2 lowerer multi-carrier extension
- Extended header PHI generation for all carriers
- Implemented loop update for all carriers using emit_carrier_update()
- Extended ExitLine/ExitMeta construction for all carriers
- Updated function call/jump args to include all carriers
- 9/10 tests passing (1 pre-existing test issue)
Task 176-4: E2E testing and bug fixes
- Fixed Trim pattern loop_var_name overwrite bug (pattern2_with_break.rs)
- Fixed InstructionRewriter latch_incoming mapping bug
- All E2E tests passing (RC=0): pos + result dual-carrier loops work
- test_jsonparser_parse_string_min2.hako verified
Task 176-5: Documentation updates
- Created phase176-completion-report.md
- Updated phase175-multicarrier-design.md with completion status
- Updated joinir-architecture-overview.md roadmap
- Updated CURRENT_TASK.md with Phase 176 completion + Phase 177 TODO
- Updated loop_pattern_space.md F-axis (multi-carrier support complete)
Technical achievements:
- Pattern2 now handles single/multiple carriers uniformly
- CarrierInfo architecture proven to work end-to-end
- Two critical bugs fixed (loop_var overwrite, latch_incoming mapping)
- No regressions in existing tests
Next: Phase 177 - Apply to JsonParser _parse_string full implementation
Debug-only verification module to catch JoinIR contract violations early:
- verify_loop_header_phis: Checks loop_var_name → PHI exists in header block
- verify_exit_line: Checks exit_bindings → values exist, exit block in range
- verify_joinir_contracts: Main entry point, runs all checks
Implementation:
- Added verification functions to merge/mod.rs (private module has type access)
- Called from merge_joinir_mir_blocks after exit block setup
- Only active in debug builds (#[cfg(debug_assertions)])
Benefits:
- Catches "动くけど header PHI 無い" bugs immediately
- Validates exit_bindings before variable_map reconnection
- Prevents silent contract violations during development
## Problem
Pattern 4 (loop with continue) was producing SSA-undef errors due to function_params
key mismatch. function_params uses 'join_func_0'/'join_func_1' format (from join_func_name()),
but code was looking for 'main'/'loop_step'.
## Solution
- Fix mod.rs: Use correct function keys 'join_func_0' and 'join_func_1'
- Add warning logs to detect future key mismatches immediately
- Update pattern4_with_continue.rs: Mark as fully implemented (not stub)
- Remove unused imports: MergeResult, TailCallKind, classify_tail_call, etc.
## Testing
- Pattern 3 (If PHI): sum=9 ✅
- Pattern 4 (Continue): 25 ✅ (1+3+5+7+9)
- No SSA-undef errors
- No new warnings on successful execution
## Debug Improvements
Added pre-flight checks in merge/mod.rs Phase 33-21:
```
[cf_loop/joinir] WARNING: function_params.get('join_func_0') returned None.
Available keys: [...]
```
This will save significant debugging time for future parameter mapping issues.
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Box theory refactoring: Extract exit_bindings construction logic from
pattern lowerers into focused, reusable ExitMetaCollector Box.
**Changes**:
1. Created meta_collector.rs (+102 lines):
- ExitMetaCollector::collect() builds exit_bindings from ExitMeta
- Pure function (no side effects)
- Reusable by all pattern lowerers
2. Updated pattern2_with_break.rs (-20 lines):
- Use ExitMetaCollector::collect() instead of inline filter_map
- Removed manual binding construction loop
- Cleaner caller code
3. Made exit_line module public:
- Allows pattern lowerers to use ExitMetaCollector
- Clear module visibility boundaries
**Box Design**:
- Single responsibility: Convert ExitMeta + variable_map → exit_bindings
- Pure function: No side effects, testable independently
- Reusable: Can be used by Pattern 3, Pattern 4, etc.
**Testing**:
- Build: ✅ Success (1m 04s)
- Execution: ✅ RC: 0 (Pattern 2 verified)
- Regression: ✅ No issues
**Metrics**:
- New lines: +102 (meta_collector.rs)
- Removed lines: -20 (pattern2_with_break.rs)
- Net change: +82 lines
- Code clarity: Significantly improved
🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>
Proper HOST↔JoinIR ValueId separation for condition variables:
- Add ConditionEnv struct (name → JoinIR-local ValueId mapping)
- Add ConditionBinding struct (HOST/JoinIR ValueId pairs)
- Modify condition_to_joinir to use ConditionEnv instead of builder.variable_map
- Update Pattern2 lowerer to build ConditionEnv and ConditionBindings
- Extend JoinInlineBoundary with condition_bindings field
- Update BoundaryInjector to inject Copy instructions for condition variables
This fixes the undefined ValueId errors where HOST ValueIds were being
used directly in JoinIR instructions. Programs now execute (RC: 0),
though loop variable exit values still need Phase 172 work.
Key invariants established:
1. JoinIR uses ONLY JoinIR-local ValueIds
2. HOST↔JoinIR bridging is ONLY through JoinInlineBoundary
3. condition_to_joinir NEVER accesses builder.variable_map
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
