hakorune/docs/archive/phases/phase-150-167/phase161_progress.md

Phase 161 Progress Summary

Status: 🎯 PHASE 161 DESIGN COMPLETE - Ready for implementation (Task 4)

Current Date: 2025-12-04 Phase Objective: Port JoinIR/MIR analysis from Rust to .hako Analyzer infrastructure Strategy: Complete design first, implement incrementally with validation at each stage

---

Completed Tasks (✅)

Task 1: JSON Format Inventory ✅

Deliverable: phase161_joinir_analyzer_design.md (1,009 lines)

Completed:

• ✅ Complete MIR JSON v1 schema documentation (14 instruction types)
• ✅ JoinIR JSON v0 schema documentation (CPS-style format)
• ✅ PHI/Loop/If identification methods with full algorithms
• ✅ Type hint propagation 4-iteration algorithm
• ✅ 3 representative JSON snippets (if_select_simple, min_loop, skip_ws)
• ✅ 5-stage implementation checklist
• ✅ Recommendation: Prioritize MIR JSON v1 over JoinIR

Key Finding: MIR JSON v1 is the primary target due to:

• Unified Call instruction (simplifies implementation)
• CFG integration (Phase 155)
• Better for .hako implementation

---

Task 2: Analyzer Box Design ✅

Deliverable: phase161_analyzer_box_design.md (250 lines)

Completed:

• ✅ Defined 3 analyzer Boxes with clear responsibilities:

  • JsonParserBox: Low-level JSON parsing (reusable)
  • MirAnalyzerBox: Primary MIR v1 analysis
  • JoinIrAnalyzerBox: JoinIR v0 conversion layer

• ✅ 7 core analyzer methods for MirAnalyzerBox:

  • validateSchema(): Verify MIR structure
  • summarize_function(): Function-level metadata
  • list_instructions(): All instructions with types
  • list_phis(): PHI detection
  • list_loops(): Loop detection with CFG
  • list_ifs(): Conditional branch detection
  • propagate_types(): Type inference system
  • reachability_analysis(): Dead code detection

• ✅ Key algorithms documented:

  • PHI detection: Pattern matching on op == "phi"
  • Loop detection: CFG backward edge analysis
  • If detection: Branch+merge identification
  • Type propagation: 4-iteration convergence

• ✅ Design principles applied:

  • 箱化 (Boxification): Each box single responsibility
  • 境界作成 (Clear Boundaries): No intermingling of concerns
  • Fail-Fast: Errors immediate, no silent failures
  • 遅延シングルトン: On-demand computation + caching

---

Task 3: Representative Function Selection ✅

Deliverable: phase161_representative_functions.md (250 lines)

Completed:

• ✅ Selected 5 representative functions covering all patterns:

  1. if_simple (⭐ Simple)

     • Tests: Branch detection, if-merge, single PHI
     • Expected: 1 PHI, 1 Branch, 1 If structure
     • File: local_tests/phase161/rep1_if_simple.hako ✅

  2. loop_simple (⭐ Simple)

     • Tests: Loop detection, back edge, loop-carried PHI
     • Expected: 1 Loop, 1 PHI at header, backward edge
     • File: local_tests/phase161/rep2_loop_simple.hako ✅

  3. if_loop (⭐⭐ Medium)

     • Tests: Nested if/loop, multiple PHI, complex control flow
     • Expected: 1 Loop, 1 If (nested), 3 PHI total
     • File: local_tests/phase161/rep3_if_loop.hako ✅

  4. loop_break (⭐⭐ Medium)

     • Tests: Loop with multiple exits, break resolution
     • Expected: 1 Loop with 2 exits, 1 If (for break)
     • File: local_tests/phase161/rep4_loop_break.hako ✅

  5. type_prop (⭐⭐ Medium)

     • Tests: Type propagation, type inference, PHI chains
     • Expected: All types consistent, 4-iteration convergence
     • File: local_tests/phase161/rep5_type_prop.hako ✅

• ✅ Created test infrastructure:

  • 5 minimal .hako test files (all created locally)
  • local_tests/phase161/README.md with complete testing guide
  • Expected analyzer outputs documented for each

Note: Test files stored in local_tests/phase161/ (not committed due to .gitignore, but available for development)

---

Architecture Overview

Data Flow (Phase 161 Complete Design)

Rust MIR JSON (input)
    ↓
    ├─→ MirAnalyzerBox (primary path)
    │   ├─→ validateSchema()
    │   ├─→ summarize_function()
    │   ├─→ list_instructions()
    │   ├─→ list_phis()
    │   ├─→ list_loops()
    │   ├─→ list_ifs()
    │   ├─→ propagate_types()
    │   └─→ reachability_analysis()
    │
    └─→ JoinIrAnalyzerBox (compatibility)
        ├─→ convert_to_mir()
        └─→ MirAnalyzerBox (reuse)

Analysis Results (output)

Box Responsibilities

Box	Lines	Responsibilities	Methods
JsonParserBox	~150	Low-level JSON parsing	get(), getArray(), getString(), getInt(), getBool()
MirAnalyzerBox	~500-600	MIR semantic analysis	7 core + 3 debug methods
JoinIrAnalyzerBox	~100	JoinIR compatibility	convert_to_mir(), validate_schema()

---

Implementation Roadmap (Phases 161-2 through 161-5)

Phase 161-2: Basic MirAnalyzerBox Structure

Scope: Get basic parsing working on simple patterns Focus: rep1_if_simple and rep2_loop_simple Deliverables:

• JsonParserBox implementation (JSON→MapBox/ArrayBox)
• MirAnalyzerBox.birth() (parse MIR JSON)
• validateSchema() (verify structure)
• summarize_function() (basic metadata)
• list_instructions() (iterate blocks)
• Unit tests for rep1 and rep2

Success Criteria:

• Can parse MIR JSON test files
• Can extract function metadata
• Can list all instructions in order
• rep1_if_simple and rep2_loop_simple passing

Estimated Effort: 3-5 days

---

Phase 161-3: PHI/Loop/If Detection

Scope: Advanced control flow analysis Focus: rep3_if_loop Deliverables:

• list_phis() implementation
• list_loops() implementation (CFG-based)
• list_ifs() implementation (merge detection)
• Algorithm correctness tests
• Validation on all 5 representatives

Success Criteria:

• All 5 representatives produce correct analysis
• PHI detection complete and accurate
• Loop detection handles back edges
• If detection identifies merge blocks

Estimated Effort: 4-6 days

---

Phase 161-4: Type Propagation

Scope: Type hint system Focus: rep5_type_prop Deliverables:

• Type extraction from instructions
• 4-iteration propagation algorithm
• Type map generation
• Type conflict detection
• Full validation

Success Criteria:

• Type map captures all ValueIds
• No type conflicts detected
• Propagation converges in ≤4 iterations
• rep5_type_prop validation complete

Estimated Effort: 2-3 days

---

Phase 161-5: Analysis Features & Integration

Scope: Extended functionality Focus: Production readiness Deliverables:

• reachability_analysis() implementation
• Debug dump methods (dump_function, dump_cfg)
• Performance optimization (caching)
• CLI wrapper script (joinir_analyze.sh)
• Final integration tests

Success Criteria:

• All analyzer methods complete
• Dead code detection working
• Performance acceptable
• CLI interface ready for Phase 162

Estimated Effort: 3-5 days

---

Key Algorithms Reference

PHI Detection Algorithm

For each block in function:
  For each instruction in block:
    If instruction.op == "phi":
      Extract destination ValueId
      For each [value, from_block] in instruction.incoming:
        Record PHI merge point
      Mark block as PHI merge block

Loop Detection Algorithm (CFG-based)

Build adjacency list from CFG
For each block B:
  For each successor S in B:
    If S's block_id < B's block_id:
      Found backward edge B → S
      S is loop header
      Find all blocks in loop via DFS from S
      Record loop structure

If Detection Algorithm

For each block B with Branch instruction:
  condition = branch.condition (ValueId)
  true_block = branch.targets[0]
  false_block = branch.targets[1]

  For each successor block S:
    If S has PHI with incoming from both true AND false:
      S is the merge block
      Record if structure

Type Propagation Algorithm

Initialize: type_map[v] = v.hint (from Const/Compare/BinOp)
Iterate 4 times:  // Maximum iterations
  For each PHI instruction:
    incoming_types = [type_map[v] for each [v, _] in phi.incoming]
    type_map[phi.dest] = merge_types(incoming_types)

  For each BinOp/Compare/etc:
    Propagate operand types to result

Exit when convergence or max iterations reached

---

Testing Strategy

Unit Level (Phase 161-2)

• Rep1 and Rep2 basic functionality
• JSON parsing correctness
• Schema validation

Integration Level (Phase 161-3)

• All 5 representatives end-to-end
• Each analyzer method validation
• Cross-representative consistency

System Level (Phase 161-5)

• CLI interface testing
• Performance profiling
• Integration with Phase 162

---

Design Decisions Documented

1. Two Analyzer Boxes: Separate concerns enable cleaner design
2. JsonParserBox Extraction: Reusability across analyzers
3. MIR v1 Primary: Simpler unified Call instruction
4. 4-Iteration Type Propagation: Empirically proven sufficient
5. Fail-Fast Semantics: No silent failures or fallbacks

---

Blockers / Risks

None identified - All design complete, ready for implementation

---

Next Steps

Immediate (Task 4)

1. Create basic JsonParserBox skeleton in .hako
2. Implement MIR JSON→MapBox parser
3. Implement summarize_function() and list_instructions()
4. Validate on rep1_if_simple and rep2_loop_simple
5. Commit Phase 161-2 implementation

Short Term

1. Implement PHI/loop/if detection (Phase 161-3)
2. Validate on all 5 representatives
3. Implement type propagation (Phase 161-4)
4. Create CLI wrapper (Phase 161-5)

Medium Term

1. Phase 162: JoinIR lowering in .hako (using MirAnalyzerBox)
2. Phase 163: Integration with existing compiler infrastructure
3. Phase 164: Performance optimization

---

Documents Reference

Document	Purpose	Status
phase161_joinir_analyzer_design.md	JSON format inventory	✅ Committed
phase161_analyzer_box_design.md	Box architecture	✅ Committed
phase161_representative_functions.md	Function selection	✅ Committed
local_tests/phase161/	Test suite	✅ Created locally

---

Summary

Phase 161 Design is Complete!

All analysis boxes are architected, all algorithms documented, all test cases selected and created. The design follows Nyash principles (箱化, 境界作成, Fail-Fast) and is ready for Phase 161-2 implementation.

Recommendation: Begin with Phase 161-2 implementation focused on basic JSON parsing and rep1/rep2 validation.

---

Status: 🚀 Ready for Phase 161 Task 4 - Basic MirAnalyzerBox Implementation Status: Historical