编译这段代码：

module mbox_tb();

    // Create a new mailbox that can hold utmost 2 items
    mailbox mbx = new(2);

    // Block1: This block keeps putting items into the mailbox
    // The rate of items being put into the mailbox is 1 every ns
    initial begin
        for (int i=0; i < 5; i++) begin
            #1 mbx.put (i);
            $display ("[%0t] Thread0: Put item #%0d, size=%0d", $time, i, mbx.num());
        end
    end

    // Block2: This block keeps getting items from the mailbox
    // The rate of items received from the mailbox is 2 every ns
    initial begin
        forever begin
            int idx;
            #2 mbx.get (idx);
            $display ("[%0t] Thread1: Got item #%0d, size=%0d", $time, idx, mbx.num());
        end
    end
endmodule : mbox_tb

并使用以下命令行：

iverilog -g2012 -I../../verilib -I./src -DUSE_INCLUDE=1 -o mbox_tb.o tb/mbox_tb.sv

得到如下结果：

tb/mbox_tb.sv:4: syntax error
tb/mbox_tb.sv:4: error: Invalid module instantiation
tb/mbox_tb.sv:5: error: Invalid module instantiation
make: *** [mbox_tb.o] Error 3

这段代码直接来自 ChipVerify 的一个示例。iverilog 是否没有实现SystemVerilog的邮箱？

解决方案

没有实现，并且据此问题的描述，也没有计划支持它：

https://github.com/steveicarus/iverilog/issues/314