63 lines
2.8 KiB
Markdown
63 lines
2.8 KiB
Markdown
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# Phase 279 P0: Type propagation pipeline SSOT unification — completion
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Status: ✅ completed (2025-12-22)
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Goal:
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- Eliminate "2本のコンパイラ" (two compilers) problem
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- Root fix for order drift where identical fixtures pass in one route but fail in another
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- Unify type propagation into single SSOT entry with fixed order
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SSOT implementation:
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- `src/mir/type_propagation/pipeline.rs` - SSOT type propagation pipeline
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- `TypePropagationPipeline::run()` - Single entry point for all routes
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Pipeline steps (fixed order):
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1. Copy propagation (initial)
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2. BinOp re-propagation (numeric promotion: Int+Float→Float)
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3. Copy propagation (propagate promoted types)
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4. PHI type inference (private step - cannot bypass)
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Callers (both routes now use SSOT):
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- `src/mir/builder/lifecycle.rs::finalize_module()` - Builder lifecycle route
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- `src/mir/join_ir_vm_bridge/joinir_function_converter.rs::propagate_types()` - JoinIR bridge route
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Fail-fast guard (structural guarantee):
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- PHI type inference is **private step** inside TypePropagationPipeline
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- lifecycle.rs and joinir_function_converter.rs **cannot call PhiTypeResolver directly**
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- Only public API: `TypePropagationPipeline::run()`
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- Order drift is **structurally impossible** (private encapsulation)
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Environment variables (reused existing flags):
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- `NYASH_PHI_GLOBAL_DEBUG=1` - PHI type inference debug output
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- `NYASH_BINOP_REPROP_DEBUG=1` - BinOp re-propagation debug output
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- **No new environment variables** (Phase 279 P0 policy)
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Files changed (6 total):
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- New: `src/mir/type_propagation/mod.rs` - Module definition
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- New: `src/mir/type_propagation/pipeline.rs` - SSOT pipeline (~300 lines)
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- Modified: `src/mir/mod.rs` - Add type_propagation module export
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- Modified: `src/mir/builder/lifecycle.rs` - Replace with SSOT call (~400 lines removed)
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- Modified: `src/mir/join_ir_vm_bridge/joinir_function_converter.rs` - Replace with SSOT call (~100 lines removed)
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- Modified: `docs/development/current/main/phases/phase-279/README.md` - Document SSOT entry
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Code reduction:
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- ~500 lines of duplicate BinOp re-propagation logic removed
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- 2 implementations consolidated into 1 SSOT
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Regression testing:
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- ✅ Lifecycle route (VM backend): Phase 275 fixture - exit=3
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- ✅ JoinIR route (VM backend): loop_min_while.hako - exit=0
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- ✅ LLVM harness: Phase 275 fixture - compiled and executed successfully
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Acceptance criteria met:
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- ✅ Single SSOT entry for type propagation (`TypePropagationPipeline::run()`)
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- ✅ Both routes call SSOT entry (lifecycle.rs + joinir_function_converter.rs)
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- ✅ No duplicate BinOp re-propagation logic
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- ✅ Fixed order: Copy → BinOp → Copy → PHI
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- ✅ Fail-fast guard prevents PHI-before-BinOp (structural guarantee)
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- ✅ All regression tests pass
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- ✅ Documentation reflects SSOT entry point
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Next phase:
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- Phase 280 (planned): Further compiler unification work
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