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    派生 FIFO 显式恢复字段自动配置

    环境：VCS W-2024.09-SP2-8。1.2 使用 uvm-1.2，2.0 使用 uvm-ieee-2020-2.0。

    实验检查观察值是否符合预期；成功复现问题不代表问题已修复。

    结果对比

    本组配置：REVIEW_FIFO_RESTORE

    观察内容 UVM 2.0
    派生 FIFO 自动配置调用次数 fifo_apply_calls 1
    build 后派生 FIFO 注册字段的实际值 fifo_configured_value 42
    kill 前 sequence 已排队响应数 responses_before_kill 1
    kill 后 sequence 为 UVM_STOPPED（1=是） sequence_stopped 1
    kill 后、再次 start 前已排队响应数 responses_after_kill 1
    显式 clear_response_queue 后响应数 responses_after_clear 0

    运行命令

    目录与环境准备；从解包根目录执行：

    1
    uv run tools/run_uvm_review.py --case doc_fact_probe --variants 20 --define REVIEW_FIFO_RESTORE --check tests/uvm_review/fifo_config_restored.expected.json

    最小源码

    doc_fact_probe.sv

    doc_fact_probe.sv 
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    `timescale 1ns/1ps
`include "uvm_macros.svh"
import uvm_pkg::*;

class fact_fifo extends uvm_tlm_fifo#(int);
  int configured_value;
  int apply_calls;
  `uvm_component_utils_begin(fact_fifo)
    `uvm_field_int(configured_value, UVM_DEFAULT)
  `uvm_component_utils_end
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction
  virtual function void apply_config_settings(bit verbose = 0);
    apply_calls++;
    super.apply_config_settings(verbose);
  endfunction
`ifdef REVIEW_FIFO_RESTORE
  virtual function bit use_automatic_config();
    return 1;
  endfunction
`endif
endclass

class fact_sequence extends uvm_sequence#(uvm_sequence_item);
  bit ready;
  function new(string name="seq"); super.new(name); endfunction
  function int pending_responses(); return response_queue.size(); endfunction
  task body();
    uvm_sequence_item response = new("response");
    put_response(response);
    ready = 1;
    wait (0);
  endtask
endclass

class fact_test extends uvm_test;
  `uvm_component_utils(fact_test)
  fact_fifo fifo;
  uvm_sequencer#(uvm_sequence_item) seqr;
  function new(string name="fact_test", uvm_component parent=null);
    super.new(name, parent);
  endfunction
  function void build_phase(uvm_phase phase);
    super.build_phase(phase);
    uvm_config_db#(uvm_bitstream_t)::set(this, "fifo", "configured_value", 42);
    fifo = new("fifo", this);
    seqr = new("seqr", this);
  endfunction
  task run_phase(uvm_phase phase);
    fact_sequence seq = new();
    phase.raise_objection(this);
    $display("REVIEW|fifo_apply_calls|%0d", fifo.apply_calls);
    $display("REVIEW|fifo_configured_value|%0d", fifo.configured_value);
    fork seq.start(seqr); join_none
    wait(seq.ready);
    $display("REVIEW|responses_before_kill|%0d", seq.pending_responses());
    seq.kill();
    $display("REVIEW|sequence_stopped|%0d", seq.get_sequence_state() == UVM_STOPPED);
    $display("REVIEW|responses_after_kill|%0d", seq.pending_responses());
    seq.clear_response_queue();
    $display("REVIEW|responses_after_clear|%0d", seq.pending_responses());
    $display("REVIEW|done|1");
    phase.drop_objection(this);
  endtask
endclass

module doc_fact_probe;
  initial run_test("fact_test");
endmodule

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