运行时对象系统重构

[yetsing]

下面是 AI 提出的一些建议

Comprehensive Analysis and Recommendations for Dai Object System

After reviewing your Dai object system implementation, I can provide several recommendations to improve its design, performance, and maintainability. This appears to be a well-structured foundation for a language runtime with custom objects.

Architecture Strengths

Your object system demonstrates several good design patterns:

• Polymorphic operations through function pointer tables (DaiOperation)
• Clear type hierarchy with a common base object type
• Consistent memory management patterns
• Good separation of concerns between different object types

Recommendations for Improvement

1. Code Organization

• Split into Multiple Files: The implementation is quite large for a single file. Consider organizing by object type:

  • dai_string.c, dai_array.c, dai_map.c, etc.
  • Use a common header for shared structures and macros

• Create Object Type Registry: Centralize type registration to make adding new types more systematic:

  typedef struct {
      const char* name;
      DaiOperation* ops;
      DaiObjFreeFunc free_func;
      // Other type metadata
  } DaiTypeInfo;
  
  static DaiTypeInfo type_registry[DAI_OBJTYPE_COUNT] = {
      [DaiObjType_string] = {"string", &string_operation, DaiObjString_Free},
      // etc.
  };

2. Memory Management

• Consistent Ownership Model: Some functions transfer ownership of strings while others don't. Make this more explicit:

  // Clearly named to indicate ownership transfer
  DaiObjString* dai_take_ownership_string(DaiVM* vm, char* chars, int length);
  DaiObjString* dai_create_string_copy(DaiVM* vm, const char* chars, int length);

• Reference Counting: Consider implementing reference counting for temporary objects:

  void dai_obj_incref(DaiObj* obj);
  void dai_obj_decref(DaiVM* vm, DaiObj* obj);

3. Method Tables and Inheritance

• Default Method Inheritance: Implement a cleaner way to inherit default methods:

  void dai_operation_inherit(DaiOperation* child, const DaiOperation* parent) {
      // Copy all function pointers from parent to child where child is NULL
      if (!child->get_property_func) child->get_property_func = parent->get_property_func;
      // etc.
  }

• Method Resolution Order: Your class hierarchy could benefit from a more formalized MRO:

  bool dai_resolve_method(DaiObjClass* klass, DaiObjString* name, DaiValue* result) {
      // Search in class, then parent classes in order
  }

4. Error Handling

• Consistent Error Pattern: Replace abort() calls with proper error returns:

  DaiResult dai_obj_array_append(DaiVM* vm, DaiObjArray* array, DaiValue value) {
      if (array->length >= array->capacity) {
          if (!dai_obj_array_grow(vm, array)) return DAI_RESULT_OOM;
      }
      // Continue with operation
      return DAI_RESULT_OK;
  }

• Error Context: Enhance error objects with call stack information:

  DaiObjError* DaiObjError_NewWithContext(DaiVM* vm, const char* message, const char* file, int line);

5. Performance Improvements

• String Interning: Your string interning could be optimized:

  // Use a faster hash table implementation specifically for strings
  // Consider small string optimization (SSO) for strings under certain length

• Method Caching: Implement method lookup caching:

  typedef struct {
      DaiObjClass* klass;
      DaiObjString* name;
      DaiValue method;
  } MethodCacheEntry;
  
  // Use a small, fixed-size cache with LRU replacement

• Property Access: Optimize common property access patterns with direct struct offsets rather than hash lookups where possible

6. API Consistency

• Method Naming: Adopt a more consistent naming convention:

  // Instead of mixed styles like:
  DaiObjString_length
  dai_default_hash
  
  // Use consistently:
  dai_string_length
  dai_object_hash

• Struct Field Organization: Group related fields together for better cache locality:

  typedef struct {
      // Core identity fields
      DaiObjType type;
      bool is_marked;
      
      // Object behavior
      DaiOperation* operation;
      
      // Linked list for GC
      struct DaiObj* next;
  } DaiObj;

7. Advanced Features to Consider

• Trait/Interface System: Implement a formal interface system beyond just operation tables:

  bool dai_object_implements_interface(DaiValue obj, DaiInterface* interface);

• JIT Integration Points: Add hooks for potential JIT compilation:

  typedef struct {
      void* jit_data;       // JIT-specific data
      bool is_jit_compiled;
      // Other JIT metadata
  } DaiJitInfo;

• Concurrency Support: Add primitives for thread safety:

  void dai_object_lock(DaiObj* obj);
  void dai_object_unlock(DaiObj* obj);

8. Testing and Debugging

• Add Invariant Checks: Implement assertions to verify object integrity:

  void dai_object_verify(DaiObj* obj) {
      assert(obj != NULL);
      assert(obj->operation != NULL);
      // More verification
  }

• Debugging Helpers: Add functions for inspection:

  void dai_object_debug_print(DaiObj* obj);
  const char* dai_object_debug_info(DaiObj* obj);

Conclusion

Your object system has a solid foundation but could benefit from these improvements for better maintainability, performance, and extensibility. The most significant gains would likely come from better code organization, consistent error handling, and optimizing the common operations like property access and method resolution.

Would you like me to elaborate on any particular aspect of these recommendations?

[yetsing]

已经拆分 DaiOperation 到单独的文件

[yetsing]

dai_object.c 已经拆分