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525e59bc8d
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feat(loop-phi): Add body-local variable PHI generation for Rust AST loops
Phase 25.1c/k: Fix ValueId undefined errors in loops with body-local variables
**Problem:**
- FuncScannerBox.scan_all_boxes/1 and BreakFinderBox._find_loops/2 had ValueId
undefined errors for variables declared inside loop bodies
- LoopFormBuilder only generated PHIs for preheader variables, missing body-locals
- Example: `local ch = s.substring(i, i+1)` inside loop → undefined on next iteration
**Solution:**
1. **Rust AST path** (src/mir/loop_builder.rs):
- Detect body-local variables by comparing body_end_vars vs current_vars
- Generate empty PHI nodes at loop header for body-local variables
- Seal PHIs with latch + continue snapshot inputs after seal_phis()
- Added HAKO_LOOP_PHI_TRACE=1 logging for debugging
2. **JSON v0 path** (already fixed in previous session):
- src/runner/json_v0_bridge/lowering/loop_.rs handles body-locals
- Uses same strategy but for JSON v0 bridge lowering
**Results:**
- ✅ FuncScannerBox.scan_all_boxes: 41 body-local PHIs generated
- ✅ Main.main (demo harness): 23 body-local PHIs generated
- ⚠️ Still some ValueId undefined errors remaining (exit PHI issue)
**Files changed:**
- src/mir/loop_builder.rs: body-local PHI generation logic
- lang/src/compiler/entry/func_scanner.hako: debug logging
- /tmp/stageb_funcscan_demo.hako: test harness
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-19 23:12:01 +09:00 |
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