`type_info_of` implementation?

herohiralal · 17 September 2025 09:38

Just curious about how the internals of some of the builtin procedures are implemented

Is there some code I can read about it?

zen3ger · 17 September 2025 19:36

Here’s the implementation for type_info_of().

You can always search for BuiltinProc_xxx in llvm_backend_proc.cpp to see if it generates a runtime call and if so to what proc or dig through the codegen to see what it will inline.

herohiralal · 18 September 2025 11:20

is there some place where i can find how/where this slice of pointers is filled?

zen3ger · 18 September 2025 15:14

github.com

odin-lang/Odin/blob/3954491393fe00ceed70e514d92fe80fb0a53713/src/llvm_backend_type.cpp#L1106


      
          
          
          	LLVMValueRef giant_const = LLVMConstArray(lb_type(m, t_type_info_ptr), giant_const_values, cast(unsigned)global_type_info_data_entity_count);
          	LLVMValueRef giant_array = lb_global_type_info_data_ptr(m).value;
          	LLVMSetInitializer(giant_array, giant_const);
          	lb_make_global_private_const(giant_array);
          	lb_set_odin_rtti_section(giant_array);
          }
          
          
          gb_internal void lb_setup_type_info_data(lbModule *m) { // NOTE(bill): Setup type_info data
          	if (build_context.no_rtti) {
          		return;
          	}
          
          
          	i64 global_type_info_data_entity_count = 0;
          
          	// NOTE(bill): Set the type_table slice with the global backing array
          	lbValue global_type_table = lb_find_runtime_value(m, str_lit("type_table"));
          	Type *type = base_type(lb_global_type_info_data_entity->type);