uvm_misc——杂货铺（miscellaneous）

　　uvm_misc 是个很有意思的文件夹，本质上就是个UVM的杂货铺，包含一些很重要的class, task, function, 但不知道给归类到哪儿，所以，uvm_misc就很好地承担了这个任务，几乎所有的设计都会遇到这种情况。在uvm_misc中有uvm_void 的定义，uvm_status_container的定义，生成随机数种子的方法实现，以及uvm_instance_scope。

virtual class uvm_void;

endclass

// Append/prepend symbolic values for order-dependent APIs

typedef enum {UVM_APPEND, UVM_PREPEND} uvm_apprepend;

// Forward declaration since scope stack uses uvm_objects now

typedef class uvm_object;

typedef class uvm_coreservice_t;

typedef class uvm_factory;

typedef class uvm_config_db;

// m_uvm_config_obj_misc is an internal typedef for the uvm_misc.svh file

// to use. UVM users should use the uvm_config_object typedef

typedef uvm_config_db#(uvm_object) m_uvm_config_obj_misc;

//----------------------------------------------------------------------------

//

// CLASS- uvm_scope_stack

//

//----------------------------------------------------------------------------

class uvm_scope_stack;

endclass

//------------------------------------------------------------------------------

//

// CLASS- uvm_status_container

//

// Internal class to contain status information for automation methods.

//

//------------------------------------------------------------------------------

class uvm_status_container;

endclass

// Variable- uvm_global_random_seed

//

// Create a seed which is based off of the global seed which can be used to seed

// srandom processes but will change if the command line seed setting is

// changed.

//

int unsigned uvm_global_random_seed = $urandom;

// Class- uvm_seed_map

//

// This map is a seed map that can be used to update seeds. The update

// is done automatically by the seed hashing routine. The seed_table_lookup

// uses an instance name lookup and the seed_table inside a given map

// uses a type name for the lookup.

//

class uvm_seed_map;

  int unsigned seed_table [string];

  int unsigned count [string];

endclass

uvm_seed_map uvm_random_seed_table_lookup [string];

//------------------------------------------------------------------------------

// Internal utility functions

//------------------------------------------------------------------------------

// Function- uvm_instance_scope

//

// A function that returns the scope that the UVM library lives in, either

// an instance, a module, or a package.

//

function string uvm_instance_scope();

endclass

参考文献：

1 uvm_void/uvm_scope_stack/uvm_status_container/uvm_copy_map/uvm_seed_map/misc
http://blog.sina.com.cn/s/blog_466496f30100xky5.html