`uvm_ctreate

### UVM Create Usage in SystemVerilog In the Universal Verification Methodology (UVM), `uvm_create` is a macro that simplifies object creation and ensures proper initialization within the factory mechanism of UVM. This approach enhances flexibility by allowing objects to be created with or without overriding their type through configuration settings. The typical use case involves creating components or transactions where specific types might need customization at runtime. The syntax generally follows this pattern: ```systemverilog // For Components uvm_component_utils_begin(my_class_name) // ... other utility declarations ... uvm_component_utils_end function new(string name, uvm_component parent); super.new(name, parent); endfunction : new task run_phase(uvm_phase phase); my_transaction trans; if (!uvm_create(trans)) begin `uvm_fatal("CREATE_FAIL", "Failed to create transaction") end // Additional operations... endtask : run_phase ``` For non-component classes such as transactions, the process differs slightly but still leverages similar principles: ```systemverilog class base_trans extends uvm_sequence_item; `uvm_object_utils(base_trans) function new(string name = "base_trans"); super.new(name); endfunction : new endclass : base_trans program test; initial begin base_trans t; void'(uvm_create(t)); // Attempting to create an instance using the factory. if (t == null) $display("Creation failed."); else $display("Successfully created."); end endprogram ``` When invoking `uvm_create`, it checks whether there exists any override configured for the specified class via the UVM factory before instantiating the requested item. If no overrides exist, then instances are generated based on the original definition provided during registration[^1].