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PHASE_WAM_GO_COMPLETED.md

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Phase Completed: WAM-to-Go Transpilation (Phases 2-5a)

Successfully implemented the core WAM-to-Go transpilation pipeline, including parallel search capabilities and improved term handling.

Accomplishments

Phase 2: WAM Instruction Lowering to Go

  • Implemented a robust WAM assembly parser wam_lines_to_go/4 in wam_go_target.pl.
  • Created mappings for all standard WAM instructions to Go struct literals.
  • Handled complex instructions like switch_on_constant and switch_on_structure with nested case data.

Phase 3: step_wam/3 Transpilation via Type Switch

  • Implemented compile_step_wam_to_go/2 which generates a Go Step() method.
  • Used Go's type switch (switch i := instr.(type)) for efficient instruction dispatch.
  • Implemented the core unification and control logic for all WAM instructions in Go.

Phase 4: Hybrid Module Assembly

  • Created write_wam_go_project/3 to automate the creation of a full Go module.
  • Implemented a suite of Mustache templates in templates/targets/go_wam/ for Go boilerplate (Value system, State, Instructions, Runtime).
  • Integrated the hybrid compilation strategy: attempts native Go lowering first, falling back to WAM for complex predicates.
  • Fixed include_package(false) usage to ensure syntactically correct lib.go.

Phase 5a: Goroutine-Based Parallel Search

  • Implemented WamState.Clone() and WamState.ForkAtChoicePoint() for state branching.
  • Added WamState.RunParallel(maxWorkers) using goroutines and a worker semaphore to explore choice points concurrently.
  • Fixed a race condition in RunParallel by ensuring semaphore tokens are passed through to child goroutines.
  • Added WamState.CollectResults() to gather values from argument registers.
  • Improved the WAM runtime with Compound term support and basic builtin execution (write/1, nl/0, numeric comparisons).
  • Implemented robust recursive structural unification (WamState.Unify) for complex terms.
  • Refined halt logic using a dedicated Halted field instead of a PC sentinel.

Phase 5b: Order-Independent Goal Parallelism

  • Added support for :- order_independent/1 and :- parallel_safe/1 directives in the clause body analysis pipeline.
  • Implemented classify_parallelism/3 to determine if a predicate's goals can be run in parallel based on purity and disjoint variable bindings.
  • Updated Go native lowering logic to emit sync.WaitGroup and goroutines for predicates classified as goal_parallel.
  • Improved output variable detection in goal_output_var_simple/2 to support general predicate calls.

Files Created/Modified

  • src/unifyweaver/core/clause_body_analysis.pl: Analysis logic for goal parallelism and directives.
  • src/unifyweaver/targets/go_target.pl: Go code generation for goroutine-based goal parallelism.
  • templates/targets/go_wam/: Go module templates.
  • tests/test_wam_go_generator.pl: Unit tests for instruction lowering.
  • tests/test_go_goal_parallel.pl: Unit tests for goal parallelism analysis and code generation.
  • PHASE_WAM_GO_COMPLETED.md: This completion report.
  • docs/design/WAM_GO_TRANSPILATION_IMPLEMENTATION_PLAN.md: Updated design plan.

Verification Results

  • Generated a complete Go project from a test predicate.
  • Verified that the generated code is syntactically correct and compiles using go build.
  • Confirmed that parallel search helpers are correctly generated and the project is self-contained.
  • Added a new unit test suite tests/test_wam_go_generator.pl covering instruction lowering and parser robustness.

Next Steps

  • Phase 5b: Implement order-independent goal parallelism.
  • Expand builtin support in WamState.executeBuiltin (e.g., is/2, arithmetic).
  • Add more comprehensive integration tests for parallel execution results.