URL
https://opencores.org/ocsvn/uart2bus_testbench/uart2bus_testbench/trunk
Subversion Repositories uart2bus_testbench
[/] [uart2bus_testbench/] [trunk/] [tb/] [uvm_src/] [dap/] [uvm_get_to_lock_dap.svh] - Rev 16
Compare with Previous | Blame | View Log
//
//------------------------------------------------------------------------------
// Copyright 2007-2011 Mentor Graphics Corporation
// Copyright 2007-2011 Cadence Design Systems, Inc.
// Copyright 2010-2011 Synopsys, Inc.
// Copyright 2013 NVIDIA Corporation
// All Rights Reserved Worldwide
//
// Licensed under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in
// writing, software distributed under the License is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See
// the License for the specific language governing
// permissions and limitations under the License.
//------------------------------------------------------------------------------
// Class: uvm_get_to_lock_dap
// Provides a 'Get-To-Lock' Data Access Policy.
//
// The 'Get-To-Lock' Data Access Policy allows for any number of 'sets',
// until the value is retrieved via a 'get'. Once 'get' has been called,
// it is illegal to 'set' a new value.
//
// The UVM uses this policy to protect the ~starting phase~ and ~automatic objection~
// values in <uvm_sequence_base>.
//
class uvm_get_to_lock_dap#(type T=int) extends uvm_set_get_dap_base#(T);
// Used for self-references
typedef uvm_get_to_lock_dap#(T) this_type;
// Parameterized Utils
`uvm_object_param_utils(uvm_get_to_lock_dap#(T))
// Stored data
local T m_value;
// Lock state
local bit m_locked;
// Function: new
// Constructor
function new(string name="unnamed-uvm_get_to_lock_dap#(T)");
super.new(name);
m_locked = 0;
endfunction : new
// Group: Set/Get Interface
// Function: set
// Updates the value stored within the DAP.
//
// ~set~ will result in an error if the value has
// already been retrieved via a call to ~get~.
virtual function void set(T value);
if (m_locked)
`uvm_error("UVM/GET_TO_LOCK_DAP/SAG",
$sformatf("Attempt to set new value on '%s', but the data access policy forbids setting after a get!",
get_full_name()))
else begin
m_value = value;
end
endfunction : set
// Function: try_set
// Attempts to update the value stored within the DAP.
//
// ~try_set~ will return a 1 if the value was successfully
// updated, or a 0 if the value can not be updated due
// to ~get~ having been called. No errors will be reported
// if ~try_set~ fails.
virtual function bit try_set(T value);
if (m_locked)
return 0;
else begin
m_value = value;
return 1;
end
endfunction : try_set
// Function: get
// Returns the current value stored within the DAP, and 'locks' the DAP.
//
// After a 'get', the value contained within the DAP cannot
// be changed.
virtual function T get();
m_locked = 1;
return m_value;
endfunction : get
// Function: try_get
// Retrieves the current value stored within the DAP, and 'locks' the DAP.
//
// ~try_get~ will always return 1.
virtual function bit try_get(output T value);
value = get();
return 1;
endfunction : try_get
// Group: Introspection
//
// The ~uvm_get_to_lock_dap~ cannot support the standard UVM
// instrumentation methods (~copy~, ~clone~, ~pack~ and
// ~unpack~), due to the fact that they would potentially
// violate the access policy.
//
// A call to any of these methods will result in an error.
virtual function void do_copy(uvm_object rhs);
`uvm_error("UVM/GET_TO_LOCK_DAP/CPY",
"'copy()' is not supported for 'uvm_get_to_lock_dap#(T)'")
endfunction : do_copy
virtual function void do_pack(uvm_packer packer);
`uvm_error("UVM/GET_TO_LOCK_DAP/PCK",
"'pack()' is not supported for 'uvm_get_to_lock_dap#(T)'")
endfunction : do_pack
virtual function void do_unpack(uvm_packer packer);
`uvm_error("UVM/GET_TO_LOCK_DAP/UPK",
"'unpack()' is not supported for 'uvm_get_to_lock_dap#(T)'")
endfunction : do_unpack
// Group- Reporting
// Function- convert2string
virtual function string convert2string();
if (m_locked)
return $sformatf("(%s) %0p [LOCKED]", `uvm_typename(m_value), m_value);
else
return $sformatf("(%s) %0p [UNLOCKED]", `uvm_typename(m_value), m_value);
endfunction : convert2string
// Function- do_print
virtual function void do_print(uvm_printer printer);
super.do_print(printer);
printer.print_field_int("lock_state", m_locked, $bits(m_locked));
printer.print_generic("value",
`uvm_typename(m_value),
0,
$sformatf("%0p", m_value));
endfunction : do_print
endclass // uvm_get_to_lock_dap