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feat(mir): Phase 1 - Loop Canonicalizer type definitions
Implements the foundation for loop canonicalization - a preprocessing
layer that decomposes AST loops into normalized skeleton representation
to prevent combinatorial explosion in pattern detection.
## Implementation (Phase 1)
Created `src/mir/loop_canonicalizer/mod.rs` with:
1. **Core Types**:
- `LoopSkeleton`: Canonical loop representation
- `SkeletonStep`: Step kinds (HeaderCond, BreakCheck, ContinueCheck, Update, Body)
- `UpdateKind`: Carrier update classification (ConstStep, Conditional, Arbitrary)
- `ExitContract`: Exit presence tracking (break/continue/return)
- `CarrierSlot`: Loop variables with roles and update rules
- `CarrierRole`: Semantic roles (Counter, Accumulator, ConditionVar, Derived)
- `CapturedSlot`: Outer scope variable capture
2. **Capability Guard**:
- `RoutingDecision`: Pattern selection with diagnostics
- `capability_tags` module: Standardized Fail-Fast vocabulary
(CAP_MISSING_CONST_STEP, CAP_MISSING_SINGLE_BREAK, etc.)
3. **Helper Methods**:
- Skeleton counting (break_checks, continue_checks)
- Carrier name extraction
- Exit contract queries
- Display implementations for debugging
4. **Unit Tests**: 6 tests covering all basic functionality
## Design Principles
- **Input**: AST only (no JoinIR dependencies)
- **Output**: LoopSkeleton only (no BlockId/ValueId)
- **Boundary**: Clear separation from lowering concerns
- **Fail-Fast**: Capability-based rejection with clear reasons
## Next Steps (Not in this commit)
- Phase 2: `LoopCanonicalizer::canonicalize(ast) -> Result<LoopSkeleton>`
- Phase 3: Test with skip_whitespace fixture
- Phase 4: Integration with existing JoinIR lowering
## Acceptance Criteria
✅ `cargo build --release` succeeds
✅ `cargo test --release --lib` passes (1039 tests)
✅ 6 new unit tests for loop_canonicalizer pass
✅ No regressions in existing tests
Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-16 04:59:26 +09:00 |
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