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DAG：自引用哈希：从任何级别的子级中搜索第一级父级，然后搜索该父级的叶子

分类：编程问答

如何解决DAG：自引用哈希：从任何级别的子级中搜索第一级父级，然后搜索该父级的叶子

| 我有电路原理图的网表（子电路集合），通常是由一些SPICE模拟器创建的。它通常具有层次结构（顶级子电路调用或实例化不同的子电路，并通过引脚定义它们之间的一些连接性）。样本网表如下所示： 
subckt AN2D0 A1 A2 VDD VSS Z

    M_u2 (net5 A2 VDD VDD) pch 
    M_u1 (net5 A1 VDD VDD) pch 
    M_u3 (Z net5 VDD VDD) pch 
    M_u4 (net17 A2 VSS VSS) nch 
    M_u2 (Z net5 VSS VSS) nch 

ends AN2D0

subckt LS_RX_CONTROLLER VDD VSS burst_start_or_sys burst_start_out pd pd_pwm_det pd_pwm_det_TII std_by std_by_or_sys sys_en sys_out

    I2 (burst_start_or_sys std_by VDD VSS burst_start_out) AN2D2
    I1 (net22 std_by_bar VDD VSS sys_out) AN2D2
    I5 (net022 pd VDD VSS pd_pwm_det) OR2D2
    I10 (net026 pd VDD VSS std_by_or_sys) NR2D2
    I9 (sys_en std_by VDD VSS net026) NR2D0
    I6 (std_by VDD VSS std_by_bar) INVD0
    I3 (pd_pwm_det_TII net037 VDD VSS net022) OR2D0
    I11 (sys_en std_by VDD VSS net037) OR2D0
    I0 (burst_start_or_sys sys_en VDD VSS net22) AN2D0

ends LS_RX_CONTROLLER
现在，可以在不同的层次结构中实例化相同的子电路。每个被调用的子电路都在调用子电路之前定义。这种图称为有向无环图。我已经从网表中创建了一个自引用HASH表，以节省空间。如果某个子电路正在调用某个子电路实例，那么它将指向该引脚。在最后的层次结构中，我们将获得MOSFET D或S或G或B节点（因为已经定义了AN2D0子电路）。如果从层次结构（除了调用子电路，例如net5）引出到父调用子电路的任何网络（实例引脚之间的连接），它将被称为pin（例如Z），并将始终列在当前子电路定义行中紧随其后的名称（子代号AN2D0 A1 A2 VDD VSS Z）。我创建了一个哈希散列。 
GRAPH --> subckt1--->p1
                     p2
                     net1
                     net2
          subckt2--->p1
                     p2
                     net1
                     net2
          subckt3--->p1 ---->I1.subckt1.p1--->pointing to value of p1 key of subckt1.
                             I2.subckt1.p2
                     p2
                     net1
                     net2
在当前情况下，GRAPH看起来像： 
the name of subcircuit-->AN2D0

     name of pin or net-->Z
         name of instant connected to it-->M_u2.nch.D
         name of instant connected to it-->M_u3.pch.D
     name of pin or net-->VDD
         name of instant connected to it-->M_u1.pch.S
         name of instant connected to it-->M_u1.pch.B
         name of instant connected to it-->M_u2.pch.S
         name of instant connected to it-->M_u3.pch.S
         name of instant connected to it-->M_u2.pch.B
         name of instant connected to it-->M_u3.pch.B
     name of pin or net-->A1
         name of instant connected to it-->M_u3.nch.G
         name of instant connected to it-->M_u1.pch.G
     name of pin or net-->VSS
         name of instant connected to it-->M_u2.nch.S
         name of instant connected to it-->M_u4.nch.B
         name of instant connected to it-->M_u2.nch.B
         name of instant connected to it-->M_u3.nch.B
         name of instant connected to it-->M_u4.nch.S
     name of pin or net-->net5
         name of instant connected to it-->M_u3.nch.D
         name of instant connected to it-->M_u3.pch.G
         name of instant connected to it-->M_u1.pch.D
         name of instant connected to it-->M_u2.pch.D
         name of instant connected to it-->M_u2.nch.G
     name of pin or net-->A2
         name of instant connected to it-->M_u4.nch.G
         name of instant connected to it-->M_u2.pch.G
     name of pin or net-->net17
         name of instant connected to it-->M_u3.nch.S
         name of instant connected to it-->M_u4.nch.D

the name of subcircuit-->LS_RX_CONTROLLER

     name of pin or net-->burst_start_or_sys
         name of instant connected to it-->I2.AN2D2.A1
            M_u3.nch.G
            M_u1.pch.G
         name of instant connected to it-->I0.AN2D0.A1
            M_u3.nch.G
            M_u1.pch.G
     name of pin or net-->burst_start_out
         name of instant connected to it-->I2.AN2D2.Z
            M_u2.nch.D
            M_u3.pch.D
     name of pin or net-->net037
         name of instant connected to it-->I11.OR2D0.Z
            M_u2.nch.D
            M_u3.pch.D
         name of instant connected to it-->I3.OR2D0.A2
            M_u3.nch.G
            M_u1.pch.G
     name of pin or net-->net026
         name of instant connected to it-->I10.NR2D2.A1
            M_u4.nch.G
            M_u2.pch.G
         name of instant connected to it-->I9.NR2D0.ZN
            M_u3.nch.D
            M_u2.pch.D
            M_u4.nch.D
     name of pin or net-->std_by
         name of instant connected to it-->I9.NR2D0.A2
            M_u3.nch.G
            M_u1.pch.G
         name of instant connected to it-->I6.INVD0.I
            M_u3.pch.G
            M_u2.nch.G
         name of instant connected to it-->I2.AN2D2.A2
            M_u4.nch.G
            M_u2.pch.G
         name of instant connected to it-->I11.OR2D0.A2
            M_u3.nch.G
            M_u1.pch.G
     name of pin or net-->sys_en
         name of instant connected to it-->I11.OR2D0.A1
            M_u4.nch.G
            M_u2.pch.G
         name of instant connected to it-->I0.AN2D0.A2
            M_u4.nch.G
            M_u2.pch.G
         name of instant connected to it-->I9.NR2D0.A1
            M_u4.nch.G
            M_u2.pch.G
     name of pin or net-->VDD
         name of instant connected to it-->I2.AN2D2.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u2.pch.S
            M_u3.pch.S
            M_u2.pch.B
            M_u3.pch.B
         name of instant connected to it-->I10.NR2D2.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u2.pch.B
         name of instant connected to it-->I0.AN2D0.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u2.pch.S
            M_u3.pch.S
            M_u2.pch.B
            M_u3.pch.B
         name of instant connected to it-->I6.INVD0.VDD
            M_u3.pch.S
            M_u3.pch.B
         name of instant connected to it-->I9.NR2D0.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u2.pch.B
         name of instant connected to it-->I1.AN2D2.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u2.pch.S
            M_u3.pch.S
            M_u2.pch.B
            M_u3.pch.B
         name of instant connected to it-->I11.OR2D0.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u3.pch.S
            M_u2.pch.B
            M_u3.pch.B
         name of instant connected to it-->I3.OR2D0.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u3.pch.S
            M_u2.pch.B
            M_u3.pch.B
         name of instant connected to it-->I5.OR2D2.VDD
            M_u1.pch.S
            M_u1.pch.B
            M_u3.pch.S
            M_u2.pch.B
            M_u3.pch.B
     name of pin or net-->sys_out
         name of instant connected to it-->I1.AN2D2.Z
            M_u2.nch.D
            M_u3.pch.D
     name of pin or net-->net022
         name of instant connected to it-->I3.OR2D0.Z
            M_u2.nch.D
            M_u3.pch.D
         name of instant connected to it-->I5.OR2D2.A1
            M_u4.nch.G
            M_u2.pch.G
     name of pin or net-->pd_pwm_det_TII
         name of instant connected to it-->I3.OR2D0.A1
            M_u4.nch.G
            M_u2.pch.G
     name of pin or net-->std_by_or_sys
         name of instant connected to it-->I10.NR2D2.ZN
            M_u3.nch.D
            M_u2.pch.D
            M_u4.nch.D
     name of pin or net-->net22
         name of instant connected to it-->I0.AN2D0.Z
            M_u2.nch.D
            M_u3.pch.D
         name of instant connected to it-->I1.AN2D2.A1
            M_u3.nch.G
            M_u1.pch.G
     name of pin or net-->pd
         name of instant connected to it-->I10.NR2D2.A2
            M_u3.nch.G
            M_u1.pch.G
         name of instant connected to it-->I5.OR2D2.A2
            M_u3.nch.G
            M_u1.pch.G
     name of pin or net-->std_by_bar
         name of instant connected to it-->I6.INVD0.ZN
            M_u2.nch.D
            M_u3.pch.D
         name of instant connected to it-->I1.AN2D2.A2
            M_u4.nch.G
            M_u2.pch.G
     name of pin or net-->VSS
         name of instant connected to it-->I11.OR2D0.VSS
            M_u3.nch.S
            M_u2.nch.S
            M_u4.nch.B
            M_u2.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I5.OR2D2.VSS
            M_u3.nch.S
            M_u4.nch.B
            M_u2.nch.S
            M_u2.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I3.OR2D0.VSS
            M_u3.nch.S
            M_u2.nch.S
            M_u4.nch.B
            M_u2.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I6.INVD0.VSS
            M_u2.nch.S
            M_u2.nch.B
         name of instant connected to it-->I0.AN2D0.VSS
            M_u2.nch.S
            M_u4.nch.B
            M_u2.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I2.AN2D2.VSS
            M_u2.nch.S
            M_u4.nch.B
            M_u2.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I1.AN2D2.VSS
            M_u2.nch.S
            M_u4.nch.B
            M_u2.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I9.NR2D0.VSS
            M_u3.nch.S
            M_u4.nch.B
            M_u3.nch.B
            M_u4.nch.S
         name of instant connected to it-->I10.NR2D2.VSS
            M_u3.nch.S
            M_u4.nch.B
            M_u3.nch.B
            M_u4.nch.S
     name of pin or net-->pd_pwm_det
         name of instant connected to it-->I5.OR2D2.Z
            M_u2.nch.D
            M_u3.pch.D
此后，将给出一个子电路名称和一个相同的引脚，可以从任何级别的层次结构中实例化该子电路名称，并且我们必须找到父电路，即追溯父电路，直到将网络拉为引脚为止。然后向后压所有叶子（MOSFET D或G或S或B引脚）。 请提出哪种算法最适合此算法，以及将其存储在自引用哈希表中是否有效。     

解决方法

        以我的经验，最好使用索引过程来生成图形中节点的唯一标识，然后创建平面散列，其中键是此id。使用ID进行链接。例如： a => b，b => c，c => d，d => a 转换成 
  %graph = (
    a => { content => ...,linksto => [ b ] },b => { content => ...,linksto => [ c ] },c => { content => ...,linksto => [ d ] },d => { content => ...,linksto => [ a ] }
  );
    

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