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//
//-----------------------------------------------------------------------------
// Copyright 2007-2011 Mentor Graphics Corporation
// Copyright 2007-2011 Cadence Design Systems, Inc.
// Copyright 2010 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.
//-----------------------------------------------------------------------------
//------------------------------------------------------------------------------
// File: Transaction Recording Databases
//
// The UVM "Transaction Recording Database" classes are an abstract representation
// of the backend tool which is recording information for the user. Usually this
// tool would be dumping information such that it can be viewed with the ~waves~
// of the DUT.
//
typedef class uvm_recorder;
typedef class uvm_tr_stream;
typedef class uvm_link_base;
typedef class uvm_simple_lock_dap;
typedef class uvm_text_tr_stream;
//------------------------------------------------------------------------------
//
// CLASS: uvm_tr_database
//
// The ~uvm_tr_database~ class is intended to hide the underlying database implementation
// from the end user, as these details are often vendor or tool-specific.
//
// The ~uvm_tr_database~ class is pure virtual, and must be extended with an
// implementation. A default text-based implementation is provided via the
// <uvm_text_tr_database> class.
//
virtual class uvm_tr_database extends uvm_object;
// Variable- m_is_opened
// Tracks the opened state of the database
local bit m_is_opened;
// Variable- m_streams
// Used for tracking streams which are between the open and closed states
local bit m_streams[uvm_tr_stream];
// Function: new
// Constructor
//
// Parameters:
// name - Instance name
function new(string name="unnamed-uvm_tr_database");
super.new(name);
endfunction : new
// Group: Database API
// Function: open_db
// Open the backend connection to the database.
//
// If the database is already open, then this
// method will return 1.
//
// Otherwise, the method will call <do_open_db>,
// and return the result.
function bit open_db();
if (!m_is_opened)
m_is_opened = do_open_db();
return m_is_opened;
endfunction : open_db
// Function: close_db
// Closes the backend connection to the database.
//
// Closing a database implicitly closes and
// frees all <uvm_tr_streams> within the database.
//
// If the database is already closed, then this
// method will return 1.
//
// Otherwise, this method will trigger a <do_close_db>
// call, and return the result.
function bit close_db();
if (m_is_opened) begin
if (do_close_db())
m_is_opened = 0;
end
return (m_is_opened == 0);
endfunction : close_db
// Function: is_open
// Returns the open/closed status of the database.
//
// This method returns 1 if the database has been
// successfully opened, but not yet closed.
//
function bit is_open();
return m_is_opened;
endfunction : is_open
// Group: Stream API
// Function: open_stream
// Provides a reference to a ~stream~ within the
// database.
//
// Parameters:
// name - A string name for the stream. This is the name associated
// with the stream in the database.
// scope - An optional scope for the stream.
// type_name - An optional name describing the type of records which
// will be created in this stream.
//
// The method returns a reference to a <uvm_tr_stream>
// object if successful, ~null~ otherwise.
//
// This method will trigger a <do_open_stream> call, and if a
// non ~null~ stream is returned, then <uvm_tr_stream::do_open>
// will be called.
//
// Streams can only be opened if the database is
// open (per <is_open>). Otherwise the request will
// be ignored, and ~null~ will be returned.
function uvm_tr_stream open_stream(string name,
string scope="",
string type_name="");
if (!open_db()) begin
return null;
end
else begin
process p = process::self();
string s;
if (p != null)
s = p.get_randstate();
open_stream = do_open_stream(name, scope, type_name);
if (open_stream != null) begin
m_streams[open_stream] = 1;
open_stream.m_do_open(this, scope, type_name);
end
if (p != null)
p.set_randstate(s);
end
endfunction : open_stream
// Function- m_free_stream
// Removes stream from the internal array
function void m_free_stream(uvm_tr_stream stream);
if (m_streams.exists(stream))
m_streams.delete(stream);
endfunction : m_free_stream
// Function: get_streams
// Provides a queue of all streams within the database.
//
// Parameters:
// q - A reference to a queue of <uvm_tr_stream>s
//
// The ~get_streams~ method returns the size of the queue,
// such that the user can conditionally process the elements.
//
// | uvm_tr_stream stream_q[$];
// | if (my_db.get_streams(stream_q)) begin
// | // Process the queue...
// | end
function unsigned get_streams(ref uvm_tr_stream q[$]);
// Clear out the queue first...
q.delete();
// Then fill in the values
foreach (m_streams[idx])
q.push_back(idx);
// Finally, return the size of the queue
return q.size();
endfunction : get_streams
// Group: Link API
// Function: establish_link
// Establishes a ~link~ between two elements in the database
//
// Links are only supported between ~streams~ and ~records~
// within a single database.
//
// This method will trigger a <do_establish_link> call.
function void establish_link(uvm_link_base link);
uvm_tr_stream s_lhs, s_rhs;
uvm_recorder r_lhs, r_rhs;
uvm_object lhs = link.get_lhs();
uvm_object rhs = link.get_rhs();
uvm_tr_database db;
if (lhs == null) begin
`uvm_warning("UVM/TR_DB/BAD_LINK",
"left hand side '<null>' is not supported in links for 'uvm_tr_database'")
return;
end
if (rhs == null) begin
`uvm_warning("UVM/TR_DB/BAD_LINK",
"right hand side '<null>' is not supported in links for 'uvm_tr_database'")
return;
end
if (!$cast(s_lhs, lhs) &&
!$cast(r_lhs, lhs)) begin
`uvm_warning("UVM/TR_DB/BAD_LINK",
$sformatf("left hand side of type '%s' not supported in links for 'uvm_tr_database'",
lhs.get_type_name()))
return;
end
if (!$cast(s_rhs, rhs) &&
!$cast(r_rhs, rhs)) begin
`uvm_warning("UVM/TR_DB/BAD_LINK",
$sformatf("right hand side of type '%s' not supported in links for 'uvm_record_datbasae'",
rhs.get_type_name()))
return;
end
if (r_lhs != null) begin
s_lhs = r_lhs.get_stream();
end
if (r_rhs != null) begin
s_rhs = r_rhs.get_stream();
end
if ((s_lhs != null) && (s_lhs.get_db() != this)) begin
db = s_lhs.get_db();
`uvm_warning("UVM/TR_DB/BAD_LINK",
$sformatf("attempt to link stream from '%s' into '%s'",
db.get_name(), this.get_name()))
return;
end
if ((s_rhs != null) && (s_rhs.get_db() != this)) begin
db = s_rhs.get_db();
`uvm_warning("UVM/TR_DB/BAD_LINK",
$sformatf("attempt to link stream from '%s' into '%s'",
db.get_name(), this.get_name()))
return;
end
do_establish_link(link);
endfunction : establish_link
// Group: Implementation Agnostic API
//
// Function: do_open_db
// Backend implementation of <open_db>
pure virtual protected function bit do_open_db();
// Function: do_close_db
// Backend implementation of <close_db>
pure virtual protected function bit do_close_db();
// Function: do_open_stream
// Backend implementation of <open_stream>
pure virtual protected function uvm_tr_stream do_open_stream(string name,
string scope,
string type_name);
// Function: do_establish_link
// Backend implementation of <establish_link>
pure virtual protected function void do_establish_link(uvm_link_base link);
endclass : uvm_tr_database
//------------------------------------------------------------------------------
//
// CLASS: uvm_text_tr_database
//
// The ~uvm_text_tr_database~ is the default implementation for the
// <uvm_tr_database>. It provides the ability to store recording information
// into a textual log file.
//
//
class uvm_text_tr_database extends uvm_tr_database;
// Variable- m_filename_dap
// Data Access Protected Filename
local uvm_simple_lock_dap#(string) m_filename_dap;
// Variable- m_file
UVM_FILE m_file;
`uvm_object_utils_begin(uvm_text_tr_database)
`uvm_object_utils_end
// Function: new
// Constructor
//
// Parameters:
// name - Instance name
function new(string name="unnamed-uvm_text_tr_database");
super.new(name);
m_filename_dap = new("filename_dap");
m_filename_dap.set("tr_db.log");
endfunction : new
// Group: Implementation Agnostic API
// Function: do_open_db
// Open the backend connection to the database.
//
// Text-Backend implementation of <uvm_tr_database::open_db>.
//
// The text-backend will open a text file to dump all records in to. The name
// of this text file is controlled via <set_file_name>.
//
// This will also lock the ~file_name~, so that it cannot be
// modified while the connection is open.
protected virtual function bit do_open_db();
if (m_file == 0) begin
m_file = $fopen(m_filename_dap.get(), "a+");
if (m_file != 0)
m_filename_dap.lock();
end
return (m_file != 0);
endfunction : do_open_db
// Function: do_close_db
// Close the backend connection to the database.
//
// Text-Backend implementation of <uvm_tr_database::close_db>.
//
// The text-backend will close the text file used to dump all records in to,
// if it is currently opened.
//
// This unlocks the ~file_name~, allowing it to be modified again.
protected virtual function bit do_close_db();
if (m_file != 0) begin
fork // Needed because $fclose is a task
$fclose(m_file);
join_none
m_filename_dap.unlock();
end
return 1;
endfunction : do_close_db
// Function: do_open_stream
// Provides a reference to a ~stream~ within the
// database.
//
// Text-Backend implementation of <uvm_tr_database::open_stream>
protected virtual function uvm_tr_stream do_open_stream(string name,
string scope,
string type_name);
uvm_text_tr_stream m_stream = uvm_text_tr_stream::type_id::create(name);
return m_stream;
endfunction : do_open_stream
// Function: do_establish_link
// Establishes a ~link~ between two elements in the database
//
// Text-Backend implementation of <uvm_tr_database::establish_link>.
protected virtual function void do_establish_link(uvm_link_base link);
uvm_recorder r_lhs, r_rhs;
uvm_object lhs = link.get_lhs();
uvm_object rhs = link.get_rhs();
void'($cast(r_lhs, lhs));
void'($cast(r_rhs, rhs));
if ((r_lhs == null) ||
(r_rhs == null))
return;
else begin
uvm_parent_child_link pc_link;
uvm_related_link re_link;
if ($cast(pc_link, link)) begin
$fdisplay(m_file," LINK @%0t {TXH1:%0d TXH2:%0d RELATION=%0s}",
$time,
r_lhs.get_handle(),
r_rhs.get_handle(),
"child");
end
else if ($cast(re_link, link)) begin
$fdisplay(m_file," LINK @%0t {TXH1:%0d TXH2:%0d RELATION=%0s}",
$time,
r_lhs.get_handle(),
r_rhs.get_handle(),
"");
end
end
endfunction : do_establish_link
// Group: Implementation Specific API
// Function: set_file_name
// Sets the file name which will be used for output.
//
// The ~set_file_name~ method can only be called prior to ~open_db~.
//
// By default, the database will use a file named "tr_db.log".
function void set_file_name(string filename);
if (filename == "") begin
`uvm_warning("UVM/TXT_DB/EMPTY_NAME",
"Ignoring attempt to set file name to ''!")
return;
end
if (!m_filename_dap.try_set(filename)) begin
`uvm_warning("UVM/TXT_DB/SET_AFTER_OPEN",
"Ignoring attempt to change file name after opening the db!")
return;
end
endfunction : set_file_name
endclass : uvm_text_tr_database