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ProXPL Code Audit & Technical Roadmap (22-04-26)

📑 Executive Summary

A comprehensive audit of the ProXPL (v1.3.1) codebase was conducted on April 22, 2026. Critical stability issues including VM divergence, GC race conditions, and memory leaks have been successfully addressed in the v1.3.1 stabilization release.

🐛 Critical Bug Findings (Resolved in v1.3.1)

1. VM "Split-Brain" Divergence (FIXED)

The Virtual Machine implemented two separate execution loops which had significant logic desync.

  • Solution: Unified the dispatch logic using a macro-based loop shared by both GNUC Computed Goto and standard Switch paths in src/runtime/vm.c. All opcodes are now consistently handled.

2. Garbage Collection Race Condition (FIXED)

In OP_MAKE_TENSOR, the new tensor object was rooted after potential GC-triggering pops.

  • Solution: Updated the VM to root the tensor object immediately upon allocation using PUSH(), then safely accessing stack elements via peek().

3. Type Checker Memory Leak (FIXED)

The TypeInfo structure was leaking symbol names during scope exit.

  • Solution: Added logic to endScope() in src/compiler/type_checker.c to properly free() the name field.

4. VM Stack Overflow Fatal Exit (FIXED)

  • Solution: Replaced exit(1) in push() with a recoverable runtimeError and stack reset, allowing the host process to continue.

🚀 Enhancement Options & Roadmap

Phase 1: Stabilization (v1.3.1) [COMPLETE]

  • Unified Dispatch Loop: Shared logic between GNUC and Fallback paths.
  • GC Rooting Audit: Immediate rooting for all new objects.
  • Type Checker Cleanup: Fixed string and parameter type leaks.

Phase 2: Runtime Completion (v1.4.0)

  • Tensor Indexing: Implement matrix[i, j] and slicing support.
  • Async/Await Scheduler: Implement the runtime event loop and task queue.
  • Standard Library Expansion: Add native JSON parsing (std.json) and basic networking (std.net).

Phase 3: Pillars Implementation (v1.5.0+)

  • ASR (Self-Healing): Implement the logic for resilient blocks.
  • Chrono-Native Logic: Background worker for temporal variables.
  • JIT Compilation: Foundation for Tier-2 JIT using LLVM.

🛠️ Actions Taken

  1. Unified the VM Loop: Fixed functional bugs and missing opcodes.
  2. Fixed Memory Leaks: Stabilized the Type Checker for long-running tasks.
  3. Refactored Error Handling: Improved robustness for host applications.

Audit Performed by: Antigravity AI
Date: April 22, 2026