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//

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

//   Copyright 2007-2011 Mentor Graphics Corporation

//   Copyright 2007-2010 Cadence Design Systems, Inc.

//   Copyright 2010 Synopsys, Inc.

//   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_topdown_phase

//

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

// Virtual base class for function phases that operate top-down.

// The pure virtual function execute() is called for each component.

//

// A top-down function phase completes when the  method

// has been called and returned on all applicable components

// in the hierarchy.

virtual class uvm_topdown_phase extends uvm_phase;

  // Function: new

  //

  // Create a new instance of a top-down phase

  //

  function new(string name);

    super.new(name,UVM_PHASE_IMP);

  endfunction

  // Function: traverse

  //

  // Traverses the component tree in top-down order, calling  for

  // each component.

  //

  virtual function void traverse(uvm_component comp,

                                 uvm_phase phase,

                                 uvm_phase_state state);

    string name;

    uvm_domain phase_domain = phase.get_domain();

    uvm_domain comp_domain = comp.get_domain();

    if (m_phase_trace)

    `uvm_info("PH_TRACE",$sformatf("topdown-phase phase=%s state=%s comp=%s comp.domain=%s phase.domain=%s",

          phase.get_name(), state.name(), comp.get_full_name(),comp_domain.get_name(),phase_domain.get_name()),

          UVM_DEBUG)

    if (phase_domain == uvm_domain::get_common_domain() ||

        phase_domain == comp_domain) begin

        case (state)

          UVM_PHASE_STARTED: begin

            comp.m_current_phase = phase;

            comp.m_apply_verbosity_settings(phase);

            comp.phase_started(phase);

            end

          UVM_PHASE_EXECUTING: begin

            if (!(phase.get_name() == "build" && comp.m_build_done)) begin

              uvm_phase ph = this;

              comp.m_phasing_active++;

              if (comp.m_phase_imps.exists(this))

                ph = comp.m_phase_imps[this];

              ph.execute(comp, phase);

              comp.m_phasing_active--;

            end

            end

          UVM_PHASE_READY_TO_END: begin

            comp.phase_ready_to_end(phase);

            end

          UVM_PHASE_ENDED: begin

            comp.phase_ended(phase);

            comp.m_current_phase = null;

            end

          default:

            `uvm_fatal("PH_BADEXEC","topdown phase traverse internal error")

        endcase

    end

    if(comp.get_first_child(name))

      do

        traverse(comp.get_child(name), phase, state);

      while(comp.get_next_child(name));

  endfunction

  // Function: execute

  //

  // Executes the top-down phase ~phase~ for the component ~comp~.

  //

  virtual function void execute(uvm_component comp,

                                          uvm_phase phase);

    // reseed this process for random stability

    process proc = process::self();

    proc.srandom(uvm_create_random_seed(phase.get_type_name(), comp.get_full_name()));

    comp.m_current_phase = phase;

    exec_func(comp,phase);

  endfunction

endclass