The uvm_printer class provides an interface for printing uvm_objects in various formats. Subtypes of uvm_printer implement different print formats, or policies.
A user-defined printer format can be created, or one of the following four built-in printers can be used:
Printers have knobs that you use to control what and how information is printed. These knobs are contained in a separate knob class:
For convenience, global instances of each printer type are available for direct reference in your testbenches.
When uvm_object::print and uvm_object::sprint are called without specifying a printer, the uvm_default_printer is used.
| uvm_printer | The uvm_printer class provides an interface for printing uvm_objects in various formats. |
| uvm_table_printer | The table printer prints output in a tabular format. |
| uvm_tree_printer | By overriding various methods of the uvm_printer super class, the tree printer prints output in a tree format. |
| uvm_line_printer | The line printer prints output in a line format. |
| uvm_printer_knobs | The uvm_printer_knobs class defines the printer settings available to all printer subtypes. |
uvm_printer_knobs knobs = new
The knob object provides access to the variety of knobs associated with a specific printer instance.
virtual function void print_int ( string name, uvm_bitstream_t value, int size, uvm_radix_enum radix = UVM_NORADIX, byte scope_separator = ".", string type_name = "" )
Prints an integral field.
| name | The name of the field. |
| value | The value of the field. |
| size | The number of bits of the field (maximum is 4096). |
| radix | The radix to use for printing. The printer knob for radix is used if no radix is specified. |
| scope_separator | is used to find the leaf name since many printers only print the leaf name of a field. Typical values for the separator are . (dot) or [ (open bracket). |
virtual function void print_object ( string name, uvm_object value, byte scope_separator = "." )
Prints an object. Whether the object is recursed depends on a variety of knobs, such as the depth knob; if the current depth is at or below the depth setting, then the object is not recursed.
By default, the children of uvm_components are printed. To turn this behavior off, you must set the uvm_component::print_enabled bit to 0 for the specific children you do not want automatically printed.
virtual function void print_string ( string name, string value, byte scope_separator = "." )
Prints a string field.
virtual function void print_time ( string name, time value, byte scope_separator = "." )
Prints a time value. name is the name of the field, and value is the value to print.
The print is subject to the $timeformat system task for formatting time values.
Prints a string field.
virtual function void print_generic ( string name, string type_name, int size, string value, byte scope_separator = "." )
Prints a field having the given name, type_name, size, and value.
virtual function string emit ()
Emits a string representing the contents of an object in a format defined by an extension of this object.
virtual function string format_row ( uvm_printer_row_info row )
Hook for producing custom output of a single field (row).
Hook to override base header with a custom header.
Hook to override base footer with a custom footer.
virtual protected function string adjust_name ( string id, byte scope_separator = "." )
Prints a field’s name, or id, which is the full instance name.
The intent of the separator is to mark where the leaf name starts if the printer if configured to print only the leaf name of the identifier.
virtual function void print_array_header( string name, int size, string arraytype = "array", byte scope_separator = "." )
Prints the header of an array. This function is called before each individual element is printed. print_array_footer is called to mark the completion of array printing.
virtual function void print_array_range ( int min, int max )
Prints a range using ellipses for values. This method is used when honoring the array knobs for partial printing of large arrays, uvm_printer_knobs::begin_elements and uvm_printer_knobs::end_elements.
This function should be called after begin_elements have been printed and before end_elements have been printed.
virtual function void print_array_footer ( int size = )
Prints the header of a footer. This function marks the end of an array print. Generally, there is no output associated with the array footer, but this method lets the printer know that the array printing is complete.
The table printer prints output in a tabular format.
The following shows sample output from the table printer.
--------------------------------------------------- Name Type Size Value --------------------------------------------------- c1 container - @1013 d1 mydata - @1022 v1 integral 32 'hcb8f1c97 e1 enum 32 THREE str string 2 hi value integral 12 'h2d ---------------------------------------------------
| uvm_table_printer | |||
| The table printer prints output in a tabular format. | |||
| Class Hierarchy | |||
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| Class Declaration | |||
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| Variables | |||
| new | Creates a new instance of uvm_table_printer. | ||
| Methods | |||
| emit | Formats the collected information from prior calls to print_* into table format. | ||
virtual function string emit()
Formats the collected information from prior calls to print_* into table format.
By overriding various methods of the uvm_printer super class, the tree printer prints output in a tree format.
The following shows sample output from the tree printer.
c1: (container@1013) {
d1: (mydata@1022) {
v1: 'hcb8f1c97
e1: THREE
str: hi
}
value: 'h2d
}| uvm_tree_printer | |||
| By overriding various methods of the uvm_printer super class, the tree printer prints output in a tree format. | |||
| Class Hierarchy | |||
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| Class Declaration | |||
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| Variables | |||
| new | Creates a new instance of uvm_tree_printer. | ||
| Methods | |||
| emit | Formats the collected information from prior calls to print_* into hierarchical tree format. | ||
virtual function string emit()
Formats the collected information from prior calls to print_* into hierarchical tree format.
The line printer prints output in a line format.
The following shows sample output from the line printer.
c1: (container@1013) { d1: (mydata@1022) { v1: 'hcb8f1c97 e1: THREE str: hi } value: 'h2d }| uvm_line_printer | ||||
| The line printer prints output in a line format. | ||||
| Class Hierarchy | ||||
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| Class Declaration | ||||
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| Variables | ||||
| new | Creates a new instance of uvm_line_printer. | |||
function new()
Creates a new instance of uvm_line_printer. It differs from the uvm_tree_printer only in that the output contains no line-feeds and indentation.
The uvm_printer_knobs class defines the printer settings available to all printer subtypes.
| uvm_printer_knobs | ||
| The uvm_printer_knobs class defines the printer settings available to all printer subtypes. | ||
| Class Declaration | ||
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| Variables | ||
| header | Indicates whether the <print_header> function should be called when printing an object. | |
| footer | Indicates whether the <print_footer> function should be called when printing an object. | |
| full_name | Indicates whether <adjust_name> should print the full name of an identifier or just the leaf name. | |
| identifier | Indicates whether <adjust_name> should print the identifier. | |
| type_name | Controls whether to print a field’s type name. | |
| size | Controls whether to print a field’s size. | |
| depth | Indicates how deep to recurse when printing objects. | |
| reference | Controls whether to print a unique reference ID for object handles. | |
| begin_elements | Defines the number of elements at the head of a list to print. | |
| end_elements | This defines the number of elements at the end of a list that should be printed. | |
| prefix | Specifies the string prepended to each output line | |
| indent | This knob specifies the number of spaces to use for level indentation. | |
| show_root | This setting indicates whether or not the initial object that is printed (when current depth is 0) prints the full path name. | |
| mcd | This is a file descriptor, or multi-channel descriptor, that specifies where the print output should be directed. | |
| separator | For tree printers only, determines the opening and closing separators used for nested objects. | |
| show_radix | Indicates whether the radix string (‘h, and so on) should be prepended to an integral value when one is printed. | |
| default_radix | This knob sets the default radix to use for integral values when no radix enum is explicitly supplied to the print_int() method. | |
| dec_radix | This string should be prepended to the value of an integral type when a radix of UVM_DEC is used for the radix of the integral object. | |
| bin_radix | This string should be prepended to the value of an integral type when a radix of UVM_BIN is used for the radix of the integral object. | |
| oct_radix | This string should be prepended to the value of an integral type when a radix of UVM_OCT is used for the radix of the integral object. | |
| unsigned_radix | This is the string which should be prepended to the value of an integral type when a radix of UVM_UNSIGNED is used for the radix of the integral object. | |
| hex_radix | This string should be prepended to the value of an integral type when a radix of UVM_HEX is used for the radix of the integral object. | |
| Methods | ||
| get_radix_str | Converts the radix from an enumerated to a printable radix according to the radix printing knobs (bin_radix, and so on). | |
bit header = 1
Indicates whether the <print_header> function should be called when printing an object.
bit footer = 1
Indicates whether the <print_footer> function should be called when printing an object.
bit full_name = 0
Indicates whether <adjust_name> should print the full name of an identifier or just the leaf name.
bit identifier = 1
Indicates whether <adjust_name> should print the identifier. This is useful in cases where you just want the values of an object, but no identifiers.
int depth = -1
Indicates how deep to recurse when printing objects. A depth of -1 means to print everything.
bit reference = 1
Controls whether to print a unique reference ID for object handles. The behavior of this knob is simulator-dependent.
int begin_elements = 5
Defines the number of elements at the head of a list to print. Use -1 for no max.
int end_elements = 5
This defines the number of elements at the end of a list that should be printed.
int indent = 2
This knob specifies the number of spaces to use for level indentation. The default level indentation is two spaces.
bit show_root = 0
This setting indicates whether or not the initial object that is printed (when current depth is 0) prints the full path name. By default, the first object is treated like all other objects and only the leaf name is printed.
int mcd = UVM_STDOUT
This is a file descriptor, or multi-channel descriptor, that specifies where the print output should be directed.
By default, the output goes to the standard output of the simulator.
string separator = "{}"
For tree printers only, determines the opening and closing separators used for nested objects.
bit show_radix = 1
Indicates whether the radix string (‘h, and so on) should be prepended to an integral value when one is printed.
uvm_radix_enum default_radix = UVM_HEX
This knob sets the default radix to use for integral values when no radix enum is explicitly supplied to the print_int() method.
string unsigned_radix = "'d"
This is the string which should be prepended to the value of an integral type when a radix of UVM_UNSIGNED is used for the radix of the integral object.
function string get_radix_str( uvm_radix_enum radix )
Converts the radix from an enumerated to a printable radix according to the radix printing knobs (bin_radix, and so on).
The uvm_printer class provides an interface for printing uvm_objects in various formats.
virtual class uvm_printer
The uvm_object class is the base class for all UVM data and hierarchical classes.
virtual class uvm_object extends uvm_void
The table printer prints output in a tabular format.
class uvm_table_printer extends uvm_printer
By overriding various methods of the uvm_printer super class, the tree printer prints output in a tree format.
class uvm_tree_printer extends uvm_printer
The line printer prints output in a line format.
class uvm_line_printer extends uvm_tree_printer
The uvm_printer_knobs class defines the printer settings available to all printer subtypes.
class uvm_printer_knobs
The tree printer is a global object that can be used with uvm_object::do_print to get multi-line tree style printing.
uvm_tree_printer uvm_default_tree_printer = new()
The line printer is a global object that can be used with uvm_object::do_print to get single-line style printing.
uvm_line_printer uvm_default_line_printer = new()
The table printer is a global object that can be used with uvm_object::do_print to get tabular style printing.
uvm_table_printer uvm_default_table_printer = new()
The default printer policy.
uvm_printer uvm_default_printer = uvm_default_table_printer
The print method deep-prints this object’s properties in a format and manner governed by the given printer argument; if the printer argument is not provided, the global uvm_default_printer is used.
function void print ( uvm_printer printer = null )
The sprint method works just like the print method, except the output is returned in a string rather than displayed.
function string sprint ( uvm_printer printer = null )
The uvm_component class is the root base class for UVM components.
virtual class uvm_component extends uvm_report_object
This bit determines if this component should automatically be printed as a child of its parent object.
bit print_enabled = 1
Prints the header of a footer.
virtual function void print_array_footer ( int size = )
Defines the number of elements at the head of a list to print.
int begin_elements = 5
This defines the number of elements at the end of a list that should be printed.
int end_elements = 5
Creates a new instance of uvm_table_printer.
function new()
Formats the collected information from prior calls to print_* into table format.
virtual function string emit()
Creates a new instance of uvm_tree_printer.
function new()
Formats the collected information from prior calls to print_* into hierarchical tree format.
virtual function string emit()
Creates a new instance of uvm_line_printer.
function new()
Indicates whether the print_header function should be called when printing an object.
bit header = 1
Indicates whether the print_footer function should be called when printing an object.
bit footer = 1
Indicates whether adjust_name should print the full name of an identifier or just the leaf name.
bit full_name = 0
Indicates whether adjust_name should print the identifier.
bit identifier = 1
Controls whether to print a field’s type name.
bit type_name = 1
Controls whether to print a field’s size.
bit size = 1
Indicates how deep to recurse when printing objects.
int depth = -1
Controls whether to print a unique reference ID for object handles.
bit reference = 1
Specifies the string prepended to each output line
string prefix = ""
This knob specifies the number of spaces to use for level indentation.
int indent = 2
This setting indicates whether or not the initial object that is printed (when current depth is 0) prints the full path name.
bit show_root = 0
This is a file descriptor, or multi-channel descriptor, that specifies where the print output should be directed.
int mcd = UVM_STDOUT
For tree printers only, determines the opening and closing separators used for nested objects.
string separator = "{}"
Indicates whether the radix string (‘h, and so on) should be prepended to an integral value when one is printed.
bit show_radix = 1
This knob sets the default radix to use for integral values when no radix enum is explicitly supplied to the print_int() method.
uvm_radix_enum default_radix = UVM_HEX
This string should be prepended to the value of an integral type when a radix of UVM_DEC is used for the radix of the integral object.
string dec_radix = "'d"
This string should be prepended to the value of an integral type when a radix of UVM_BIN is used for the radix of the integral object.
string bin_radix = "'b"
This string should be prepended to the value of an integral type when a radix of UVM_OCT is used for the radix of the integral object.
string oct_radix = "'o"
This is the string which should be prepended to the value of an integral type when a radix of UVM_UNSIGNED is used for the radix of the integral object.
string unsigned_radix = "'d"
This string should be prepended to the value of an integral type when a radix of UVM_HEX is used for the radix of the integral object.
string hex_radix = "'h"
Converts the radix from an enumerated to a printable radix according to the radix printing knobs (bin_radix, and so on).
function string get_radix_str( uvm_radix_enum radix )