uvm_printer及使用
1.uvm_printer使用示例
(1) 在调用uvm_top.print_topology()函数时,可以不指定uvm_printer参数;
(2) 在不指定uvm_printer参数的情况下,会使用uvm_default_table_printer;
(3) 如果有需要指定uvm_printer参数,可以指定为其他参数,如uvm_default_tree_printer, uvm_default_line_printer或其他用户自定义的printer;
1 // Variable: uvm_default_table_printer 2 // 3 // The table printer is a global object that can be used with 4 // <uvm_object::do_print> to get tabular style printing. 5 6 uvm_table_printer uvm_default_table_printer = new(); 7 8 9 // Variable: uvm_default_tree_printer 10 // 11 // The tree printer is a global object that can be used with 12 // <uvm_object::do_print> to get multi-line tree style printing. 13 14 uvm_tree_printer uvm_default_tree_printer = new(); 15 16 17 // Variable: uvm_default_line_printer 18 // 19 // The line printer is a global object that can be used with 20 // <uvm_object::do_print> to get single-line style printing. 21 22 uvm_line_printer uvm_default_line_printer = new(); 23 24 25 // Variable: uvm_default_printer 26 // 27 // The default printer policy. Used when calls to <uvm_object::print> 28 // or <uvm_object::sprint> do not specify a printer policy. 29 // 30 // The default printer may be set to any legal <uvm_printer> derived type, 31 // including the global line, tree, and table printers described above. 32 33 uvm_printer uvm_default_printer = uvm_default_table_printer;
1 function void uvm_root::print_topology(uvm_printer printer=null); 2 3 string s; 4 5 if (m_children.num()==0) begin 6 uvm_report_warning("EMTCOMP", "print_topology - No UVM components to print.", UVM_NONE); 7 return; 8 end 9 10 if (printer==null) 11 printer = uvm_default_printer; 12 13 foreach (m_children[c]) begin 14 if(m_children[c].print_enabled) begin 15 printer.print_object("", m_children[c]); 16 end 17 end 18 `uvm_info("UVMTOP",{"UVM testbench topology:\n",printer.emit()},UVM_NONE) 19 20 endfunction
2.uvm_printer
1 //------------------------------------------------------------------------------ 2 // 3 // Class: uvm_printer 4 // 5 // The uvm_printer class provides an interface for printing <uvm_objects> in 6 // various formats. Subtypes of uvm_printer implement different print formats, 7 // or policies. 8 // 9 // A user-defined printer format can be created, or one of the following four 10 // built-in printers can be used: 11 // 12 // - <uvm_printer> - provides base printer functionality; must be overridden. 13 // 14 // - <uvm_table_printer> - prints the object in a tabular form. 15 // 16 // - <uvm_tree_printer> - prints the object in a tree form. 17 // 18 // - <uvm_line_printer> - prints the information on a single line, but uses the 19 // same object separators as the tree printer. 20 // 21 // Printers have knobs that you use to control what and how information is printed. 22 // These knobs are contained in a separate knob class: 23 // 24 // - <uvm_printer_knobs> - common printer settings 25 // 26 // For convenience, global instances of each printer type are available for 27 // direct reference in your testbenches. 28 // 29 // - <uvm_default_tree_printer> 30 // - <uvm_default_line_printer> 31 // - <uvm_default_table_printer> 32 // - <uvm_default_printer> (set to default_table_printer by default) 33 // 34 // When <uvm_object::print> and <uvm_object::sprint> are called without 35 // specifying a printer, the <uvm_default_printer> is used. 36 // 37 //------------------------------------------------------------------------------ 38 virtual class uvm_printer; 39 40 ... 41 extern virtual function void print_object (string name, 42 uvm_object value, 43 byte scope_separator="."); 44 ... 45 endclass
3.uvm_printer派生类
3.1 uvm_table_printer
1 //------------------------------------------------------------------------------ 2 // 3 // Class: uvm_table_printer 4 // 5 // The table printer prints output in a tabular format. 6 // 7 // The following shows sample output from the table printer. 8 // 9 //| --------------------------------------------------- 10 //| Name Type Size Value 11 //| --------------------------------------------------- 12 //| c1 container - @1013 13 //| d1 mydata - @1022 14 //| v1 integral 32 'hcb8f1c97 15 //| e1 enum 32 THREE 16 //| str string 2 hi 17 //| value integral 12 'h2d 18 //| --------------------------------------------------- 19 // 20 //------------------------------------------------------------------------------
class uvm_table_printer extends uvm_printer; // Variable: new // // Creates a new instance of ~uvm_table_printer~. // extern function new(); // Function: emit // // Formats the collected information from prior calls to ~print_*~ // into table format. // extern virtual function string emit(); // Variables- m_max_* // // holds max size of each column, so table columns can be resized dynamically protected int m_max_name; protected int m_max_type; protected int m_max_size; protected int m_max_value; extern function void calculate_max_widths(); endclass
3.2 uvm_tree_printer
1 //------------------------------------------------------------------------------ 2 // 3 // Class: uvm_tree_printer 4 // 5 // By overriding various methods of the <uvm_printer> super class, 6 // the tree printer prints output in a tree format. 7 // 8 // The following shows sample output from the tree printer. 9 // 10 //| c1: (container@1013) { 11 //| d1: (mydata@1022) { 12 //| v1: 'hcb8f1c97 13 //| e1: THREE 14 //| str: hi 15 //| } 16 //| value: 'h2d 17 //| } 18 // 19 //------------------------------------------------------------------------------
1 class uvm_tree_printer extends uvm_printer; 2 3 string newline = "\n"; 4 5 // Variable: new 6 // 7 // Creates a new instance of ~uvm_tree_printer~. 8 9 extern function new(); 10 11 // Function: emit 12 // 13 // Formats the collected information from prior calls to ~print_*~ 14 // into hierarchical tree format. 15 // 16 extern virtual function string emit(); 17 18 endclass
3.3 uvm_line_printer
1 //------------------------------------------------------------------------------ 2 // 3 // Class: uvm_line_printer 4 // 5 // The line printer prints output in a line format. 6 // 7 // The following shows sample output from the line printer. 8 // 9 //| c1: (container@1013) { d1: (mydata@1022) { v1: 'hcb8f1c97 e1: THREE str: hi } value: 'h2d } 10 //------------------------------------------------------------------------------
1 class uvm_line_printer extends uvm_tree_printer; 2 3 // Variable: new 4 // 5 // Creates a new instance of ~uvm_line_printer~. It differs from the 6 // <uvm_tree_printer> only in that the output contains no line-feeds 7 // and indentation. 8 9 function new(); 10 newline = " "; 11 knobs.indent = 0; 12 endfunction 13 14 endclass
