(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:tracing)
          op: Equal
          rhs: {(/sys/kernel/debug/tracing)}
          spids: [148]
        )
      ]
      spids: [148]
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [
            (assign_pair
              lhs: (LhsName name:flock)
              op: Equal
              rhs: {(/var/tmp/.ftrace-lock)}
              spids: [151]
            )
          ]
          spids: [151]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:wroteflock) op:Equal rhs:{(0)} spids:[155])]
      spids: [155]
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_duration) op:Equal rhs:{(0)} spids:[158])]
          spids: [158]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:duration) op:Equal rhs:{(EmptyPart)} spids:[162])]
          spids: [162]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_pid) op:Equal rhs:{(0)} spids:[165])]
          spids: [165]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:pid) op:Equal rhs:{(EmptyPart)} spids:[169])]
          spids: [169]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_tid) op:Equal rhs:{(0)} spids:[172])]
          spids: [172]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:tid) op:Equal rhs:{(EmptyPart)} spids:[176])]
      spids: [176]
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_filter) op:Equal rhs:{(0)} spids:[178])]
          spids: [178]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:filter) op:Equal rhs:{(EmptyPart)} spids:[182])]
          spids: [182]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_view) op:Equal rhs:{(0)} spids:[185])]
          spids: [185]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_headers) op:Equal rhs:{(0)} spids:[189])]
          spids: [189]
        )
      terminator: <Op_Semi ';'>
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:opt_stack) op:Equal rhs:{(0)} spids:[193])]
          spids: [193]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:dmesg) op:Equal rhs:{(2)} spids:[197])]
      spids: [197]
    )
    (Sentence
      child: 
        (Assignment
          keyword: Assign_None
          pairs: [(assign_pair lhs:(LhsName name:debug) op:Equal rhs:{(0)} spids:[200])]
          spids: [200]
        )
      terminator: <Op_Semi ';'>
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:opt_force) op:Equal rhs:{(0)} spids:[204])]
      spids: [204]
    )
    (C {(trap)} {(SQ <':'>)} {(INT)} {(QUIT)} {(TERM)} {(PIPE)} {(HUP)})
    (FuncDef
      name: usage
      body: 
        (BraceGroup
          children: [
            (SimpleCommand
              words: [{(cat)}]
              redirects: [
                (HereDoc
                  op_id: Redir_DLessDash
                  fd: 16777215
                  body: 
                    {
                      (DQ 
                        (
'USAGE: kprobe [-FhHsv] [-d secs] [-p PID] [-L TID] kprobe_definition [filter]\n'
                        ) ('                 -F              # force. trace despite warnings.\n') 
                        ('                 -d seconds      # trace duration, and use buffers\n') ('                 -p PID          # PID to match on events\n') 
                        ('                 -L TID          # thread id to match on events\n') ("                 -v              # view format file (don't trace)\n") 
                        ('                 -H              # include column headers\n') ('                 -s              # show kernel stack traces\n') 
                        ('                 -h              # this usage message\n') ('\n') ('Note that these examples may need modification to match your kernel\n') 
                        ("version's function names and platform's register usage.\n") ('   eg,\n') ('       kprobe p:do_sys_open\n') 
                        ('                                 # trace open() entry\n') ('       kprobe r:do_sys_open\n') ('                                 # trace open() return\n') 
                        ("       kprobe 'r:do_sys_open ") (EscapedLiteralPart token:<Lit_EscapedChar '\\$'>) ("retval'\n") 
                        ('                                 # trace open() return value\n') ("       kprobe 'r:myopen do_sys_open ") (EscapedLiteralPart token:<Lit_EscapedChar '\\$'>) 
                        ("retval'\n") ('                                 # use a custom probe name\n') 
                        ("       kprobe 'p:myopen do_sys_open mode=%cx:u16'\n") ('                                 # trace open() file mode\n') 
                        ("       kprobe 'p:myopen do_sys_open filename=+0(%si):string'\n") ('                                 # trace open() with filename\n') 
                        ("       kprobe -s 'p:myprobe tcp_retransmit_skb'\n") ('                                 # show kernel stacks\n') 
                        ("       kprobe 'p:do_sys_open file=+0(%si):string' 'file ~ ") (Right_DoubleQuote '"') ('*stat') (Right_DoubleQuote '"') ("'\n") 
                        ('                                 # opened files ending in ') (Right_DoubleQuote '"') (stat) (Right_DoubleQuote '"') ('\n') ('\n') 
                        ('See the man page and example file for more info.\n')
                      )
                    }
                  do_expansion: True
                  here_end: END
                  was_filled: T
                  spids: [236]
                )
                (Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[239])
              ]
            )
            (ControlFlow token:<ControlFlow_Exit exit>)
          ]
          spids: [231]
        )
      spids: [227 230]
    )
    (FuncDef
      name: warn
      body: 
        (BraceGroup
          children: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (Pipeline children:[(C {(eval)} {(DQ ($ VSub_At '$@'))})] negated:T)
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (SimpleCommand
                      words: [
                        {(echo)}
                        {
                          (DQ ('WARNING: command failed ') 
                            (EscapedLiteralPart
                              token: <Lit_EscapedChar '\\"'>
                            ) ($ VSub_At '$@') (EscapedLiteralPart token:<Lit_EscapedChar '\\"'>)
                          )
                        }
                      ]
                      redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[315])]
                    )
                  ]
                  spids: [16777215 310]
                )
              ]
              spids: [16777215 326]
            )
          ]
          spids: [296]
        )
      spids: [292 295]
    )
    (FuncDef
      name: end
      body: 
        (BraceGroup
          children: [
            (SimpleCommand
              words: [{(echo)}]
              redirects: [(Redir op_id:Redir_Great fd:2 arg_word:{(/dev/null)} spids:[344])]
            )
            (SimpleCommand
              words: [{(echo)} {(DQ ('Ending tracing...'))}]
              redirects: [(Redir op_id:Redir_Great fd:2 arg_word:{(/dev/null)} spids:[354])]
            )
            (C {(cd)} {($ VSub_Name '$tracing')})
            (C {(warn)} {(DQ ('echo 0 > events/kprobes/') ($ VSub_Name '$kname') (/enable))})
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (DParen child:(ArithVarRef name:opt_filter))
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (C {(warn)} {(DQ ('echo 0 > events/kprobes/') ($ VSub_Name '$kname') (/filter))})
                  ]
                  spids: [16777215 382]
                )
              ]
              spids: [16777215 394]
            )
            (C {(warn)} {(DQ ('echo -:') ($ VSub_Name '$kname') (' >> kprobe_events'))})
            (AndOr
              ops: [Op_DAmp]
              children: [
                (DParen child:(ArithVarRef name:opt_stack))
                (C {(warn)} {(DQ ('echo 0 > options/stacktrace'))})
              ]
            )
            (C {(warn)} {(DQ ('echo > trace'))})
            (AndOr
              ops: [Op_DAmp]
              children: [
                (DParen child:(ArithVarRef name:wroteflock))
                (C {(warn)} {(DQ ('rm ') ($ VSub_Name '$flock'))})
              ]
            )
          ]
          spids: [335]
        )
      spids: [331 334]
    )
    (FuncDef
      name: die
      body: 
        (BraceGroup
          children: [
            (SimpleCommand
              words: [{(echo)} {(DQ ($ VSub_At '$@'))}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[457])]
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [452]
        )
      spids: [448 451]
    )
    (FuncDef
      name: edie
      body: 
        (BraceGroup
          children: [
            (SimpleCommand
              words: [{(echo)} {(DQ ($ VSub_At '$@'))}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[485])]
            )
            (SimpleCommand
              words: [{(exec)}]
              redirects: [
                (Redir
                  op_id: Redir_Great
                  fd: 16777215
                  arg_word: {(/dev/null)}
                  spids: [495]
                )
                (Redir op_id:Redir_GreatAnd fd:2 arg_word:{(1)} spids:[498])
              ]
            )
            (C {(end)})
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [476]
        )
      spids: [472 475]
    )
    (While
      cond: [
        (C {(getopts)} {(Fd) (Lit_Other ':') (hHp) (Lit_Other ':') (L) (Lit_Other ':') (sv)} {(opt)})
      ]
      body: 
        (DoGroup
          children: [
            (Case
              to_match: {($ VSub_Name '$opt')}
              arms: [
                (case_arm
                  pat_list: [{(F)}]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:opt_force)
                          op: Equal
                          rhs: {(1)}
                          spids: [542]
                        )
                      ]
                      spids: [542]
                    )
                  ]
                  spids: [539 540 545 16777215]
                )
                (case_arm
                  pat_list: [{(d)}]
                  action: [
                    (Sentence
                      child: 
                        (Assignment
                          keyword: Assign_None
                          pairs: [
                            (assign_pair
                              lhs: (LhsName name:opt_duration)
                              op: Equal
                              rhs: {(1)}
                              spids: [551]
                            )
                          ]
                          spids: [551]
                        )
                      terminator: <Op_Semi ';'>
                    )
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:duration)
                          op: Equal
                          rhs: {($ VSub_Name '$OPTARG')}
                          spids: [555]
                        )
                      ]
                      spids: [555]
                    )
                  ]
                  spids: [548 549 558 16777215]
                )
                (case_arm
                  pat_list: [{(p)}]
                  action: [
                    (Sentence
                      child: 
                        (Assignment
                          keyword: Assign_None
                          pairs: [
                            (assign_pair
                              lhs: (LhsName name:opt_pid)
                              op: Equal
                              rhs: {(1)}
                              spids: [564]
                            )
                          ]
                          spids: [564]
                        )
                      terminator: <Op_Semi ';'>
                    )
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:pid)
                          op: Equal
                          rhs: {($ VSub_Name '$OPTARG')}
                          spids: [568]
                        )
                      ]
                      spids: [568]
                    )
                  ]
                  spids: [561 562 571 16777215]
                )
                (case_arm
                  pat_list: [{(L)}]
                  action: [
                    (Sentence
                      child: 
                        (Assignment
                          keyword: Assign_None
                          pairs: [
                            (assign_pair
                              lhs: (LhsName name:opt_tid)
                              op: Equal
                              rhs: {(1)}
                              spids: [577]
                            )
                          ]
                          spids: [577]
                        )
                      terminator: <Op_Semi ';'>
                    )
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:tid)
                          op: Equal
                          rhs: {($ VSub_Name '$OPTARG')}
                          spids: [581]
                        )
                      ]
                      spids: [581]
                    )
                  ]
                  spids: [574 575 584 16777215]
                )
                (case_arm
                  pat_list: [{(H)}]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:opt_headers)
                          op: Equal
                          rhs: {(1)}
                          spids: [590]
                        )
                      ]
                      spids: [590]
                    )
                  ]
                  spids: [587 588 593 16777215]
                )
                (case_arm
                  pat_list: [{(s)}]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:opt_stack)
                          op: Equal
                          rhs: {(1)}
                          spids: [599]
                        )
                      ]
                      spids: [599]
                    )
                  ]
                  spids: [596 597 602 16777215]
                )
                (case_arm
                  pat_list: [{(v)}]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:opt_view)
                          op: Equal
                          rhs: {(1)}
                          spids: [608]
                        )
                      ]
                      spids: [608]
                    )
                  ]
                  spids: [605 606 611 16777215]
                )
                (case_arm
                  pat_list: [{(h)} {(Lit_Other '?')}]
                  action: [(C {(usage)})]
                  spids: [614 617 621 16777215]
                )
              ]
              spids: [532 536 624]
            )
          ]
          spids: [529 626]
        )
    )
    (C {(shift)} 
      {
        (ArithSubPart
          anode: 
            (ArithBinary
              op_id: Arith_Minus
              left: (ArithWord w:{($ VSub_Name '$OPTIND')})
              right: (ArithWord w:{(Lit_Digits 1)})
            )
          spids: [630 639]
        )
      }
    )
    (AndOr
      ops: [Op_DPipe]
      children: [(DParen child:(ArithWord w:{($ VSub_Pound '$#')})) (C {(usage)})]
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:kprobe) op:Equal rhs:{($ VSub_Number '$1')} spids:[652])]
      spids: [652]
    )
    (C {(shift)})
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: (DParen child:(ArithWord w:{($ VSub_Pound '$#')}))
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [(assign_pair lhs:(LhsName name:opt_filter) op:Equal rhs:{(1)} spids:[670])]
              spids: [670]
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:filter)
                  op: Equal
                  rhs: {($ VSub_Number '$1')}
                  spids: [674]
                )
              ]
              spids: [674]
            )
          ]
          spids: [16777215 667]
        )
      ]
      spids: [16777215 677]
    )
    (AndOr
      ops: [Op_DAmp]
      children: [
        (DParen
          child: 
            (ArithBinary
              op_id: Arith_Great
              left: 
                (ArithBinary
                  op_id: Arith_Plus
                  left: 
                    (ArithBinary
                      op_id: Arith_Plus
                      left: (ArithVarRef name:opt_pid)
                      right: (ArithVarRef name:opt_filter)
                    )
                  right: (ArithVarRef name:opt_tid)
                )
              right: (ArithWord w:{(Lit_Digits 1)})
            )
        )
        (C {(die)} {(DQ ('ERROR: use at most one of -p, -L, or filter.'))})
      ]
    )
    (AndOr
      ops: [Op_DAmp]
      children: [
        (DParen
          child: 
            (ArithBinary
              op_id: Arith_DAmp
              left: (ArithVarRef name:opt_duration)
              right: (ArithVarRef name:opt_view)
            )
        )
        (C {(die)} {(DQ ('ERROR: use either -d or -v.'))})
      ]
    )
    (If
      arms: [
        (if_arm
          cond: [(Sentence child:(DParen child:(ArithVarRef name:opt_pid)) terminator:<Op_Semi ';'>)]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [(assign_pair lhs:(LhsName name:opt_filter) op:Equal rhs:{(1)} spids:[748])]
              spids: [748]
            )
            (ForEach
              iter_name: tid
              iter_words: [{(/proc/) ($ VSub_Name '$pid') (/task/) (Lit_Other '*')}]
              do_arg_iter: F
              body: 
                (DoGroup
                  children: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:filter)
                          op: Equal
                          rhs: 
                            {
                              (DQ ($ VSub_Name '$filter') (' || common_pid == ') 
                                (BracedVarSub
                                  token: <VSub_Name tid>
                                  suffix_op: 
                                    (StringUnary
                                      op_id: VOp1_DPound
                                      arg_word: {('*') (Lit_Slash /)}
                                    )
                                  spids: [775 780]
                                )
                              )
                            }
                          spids: [771]
                        )
                      ]
                      spids: [771]
                    )
                  ]
                  spids: [768 784]
                )
              spids: [761 766]
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:filter)
                  op: Equal
                  rhs: 
                    {
                      (BracedVarSub
                        token: <VSub_Name filter>
                        suffix_op: (Slice begin:(ArithWord w:{(Lit_Digits 3)}))
                        spids: [788 792]
                      )
                    }
                  spids: [787]
                )
              ]
              spids: [787]
            )
          ]
          spids: [16777215 741]
        )
      ]
      spids: [16777215 797]
    )
    (If
      arms: [
        (if_arm
          cond: [(Sentence child:(DParen child:(ArithVarRef name:opt_tid)) terminator:<Op_Semi ';'>)]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [(assign_pair lhs:(LhsName name:opt_filter) op:Equal rhs:{(1)} spids:[812])]
              spids: [812]
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:filter)
                  op: Equal
                  rhs: {(DQ ('common_pid == ') ($ VSub_Name '$tid'))}
                  spids: [816]
                )
              ]
              spids: [816]
            )
          ]
          spids: [16777215 809]
        )
      ]
      spids: [16777215 822]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (DBracket
                  expr: 
                    (LogicalAnd
                      left: 
                        (BoolBinary
                          op_id: BoolBinary_GlobNEqual
                          left: {(DQ ($ VSub_Name '$kprobe'))}
                          right: {(p) (Lit_Other ':') (Lit_Other '*')}
                        )
                      right: 
                        (BoolBinary
                          op_id: BoolBinary_GlobNEqual
                          left: {(DQ ($ VSub_Name '$kprobe'))}
                          right: {(r) (Lit_Other ':') (Lit_Other '*')}
                        )
                    )
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (SimpleCommand
              words: [{(echo)} {(DQ ('ERROR: invalid kprobe definition (should start with p: or r:)'))}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[858])]
            )
            (C {(usage)})
          ]
          spids: [16777215 853]
        )
      ]
      spids: [16777215 868]
    )
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:krest)
          op: Equal
          rhs: 
            {
              (BracedVarSub
                token: <VSub_Name kprobe>
                suffix_op: (StringUnary op_id:VOp1_Pound arg_word:{('*:')})
                spids: [907 911]
              )
            }
          spids: [906]
        )
      ]
      spids: [906]
    )
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:kname)
          op: Equal
          rhs: 
            {
              (BracedVarSub
                token: <VSub_Name krest>
                suffix_op: (StringUnary op_id:VOp1_DPercent arg_word:{(' *')})
                spids: [914 918]
              )
            }
          spids: [913]
        )
      ]
      spids: [913]
    )
    (C {(set)} {(--)} {($ VSub_Name '$krest')})
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (DBracket
                  expr: 
                    (LogicalOr
                      left: (BoolBinary op_id:BoolBinary_GlobDEqual left:{($ VSub_Number '$2')} right:{(DQ )})
                      right: 
                        (BoolBinary
                          op_id: BoolBinary_GlobDEqual
                          left: {($ VSub_Number '$2')}
                          right: 
                            {(Lit_Other '*') (Lit_Other '[') (BoolBinary_GlobEqual '=') 
                              (Lit_Other '%') (EscapedLiteralPart token:<Lit_EscapedChar '\\$'>) (Lit_Other ']') (Lit_Other '*')
                            }
                        )
                    )
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:ktype)
                  op: Equal
                  rhs: 
                    {
                      (BracedVarSub
                        token: <VSub_Name kprobe>
                        suffix_op: (StringUnary op_id:VOp1_DPercent arg_word:{(':*')})
                        spids: [962 966]
                      )
                    }
                  spids: [961]
                )
              ]
              spids: [961]
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:kprobe)
                  op: Equal
                  rhs: 
                    {
                      (DQ ($ VSub_Name '$ktype') (':') ($ VSub_Name '$kname') (' ') 
                        ($ VSub_Name '$krest')
                      )
                    }
                  spids: [969]
                )
              ]
              spids: [969]
            )
          ]
          spids: [16777215 954]
        )
      ]
      spids: [16777215 978]
    )
    (If
      arms: [
        (if_arm
          cond: [(Sentence child:(DParen child:(ArithVarRef name:debug)) terminator:<Op_Semi ';'>)]
          action: [
            (C {(echo)} {(DQ ('kname: ') ($ VSub_Name '$kname') (', kprobe: ') ($ VSub_Name '$kprobe'))})
          ]
          spids: [16777215 990]
        )
      ]
      spids: [16777215 1002]
    )
    (AndOr
      ops: [Op_DPipe]
      children: [
        (C {(cd)} {($ VSub_Name '$tracing')})
        (C {(die)} 
          {
            (DQ ('ERROR: accessing tracing. Root user? Kernel has FTRACE?\n') 
              ('    debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)')
            )
          }
        )
      ]
    )
    (C {(set)} {(--)} {($ VSub_Name '$kprobe')})
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:fname) op:Equal rhs:{($ VSub_Number '$2')} spids:[1031])]
      spids: [1031]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (AndOr
              ops: [Op_DAmp]
              children: [
                (DParen
                  child: (ArithUnary op_id:Arith_Bang child:(ArithVarRef name:opt_force))
                )
                (Pipeline
                  children: [
                    (SimpleCommand
                      words: [{(grep)} {(-w)} {($ VSub_Name '$fname')} {(available_filter_functions)}]
                      redirects: [
                        (Redir
                          op_id: Redir_Great
                          fd: 16777215
                          arg_word: {(/dev/null)}
                          spids: [1056]
                        )
                        (Redir
                          op_id: Redir_GreatAnd
                          fd: 2
                          arg_word: {(1)}
                          spids: [1061]
                        )
                      ]
                    )
                  ]
                  negated: T
                )
              ]
            )
          ]
          action: [
            (SimpleCommand
              words: [
                {(echo)}
                {
                  (DQ ('ERROR: func ') ($ VSub_Name '$fname') (' not in ') ($ VSub_Name '$PWD') 
                    (/available_filter_functions.)
                  )
                }
              ]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[1069])]
            )
            (SimpleCommand
              words: [{(printf)} {(DQ ("Either it doesn't exist, or, it might be unsafe to kprobe. "))}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[1083])]
            )
            (SimpleCommand
              words: [{(echo)} {(DQ ('Exiting. Use -F to override.'))}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[1093])]
            )
            (ControlFlow token:<ControlFlow_Exit exit> arg_word:{(1)})
          ]
          spids: [16777215 1064]
        )
      ]
      spids: [16777215 1105]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: (DParen child:(ArithUnary op_id:Arith_Bang child:(ArithVarRef name:opt_view)))
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (DParen child:(ArithVarRef name:opt_duration))
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (C {(echo)} 
                      {
                        (DQ ('Tracing kprobe ') ($ VSub_Name '$kname') (' for ') 
                          ($ VSub_Name '$duration') (' seconds (buffered)...')
                        )
                      }
                    )
                  ]
                  spids: [16777215 1132]
                )
              ]
              else_action: [
                (C {(echo)} {(DQ ('Tracing kprobe ') ($ VSub_Name '$kname') ('. Ctrl-C to end.'))})
              ]
              spids: [1146 1158]
            )
          ]
          spids: [16777215 1119]
        )
      ]
      spids: [16777215 1160]
    )
    (AndOr
      ops: [Op_DAmp]
      children: [
        (DBracket expr:(BoolUnary op_id:BoolUnary_e child:{($ VSub_Name '$flock')}))
        (C {(die)} 
          {
            (DQ ('ERROR: ftrace may be in use by PID ') 
              (CommandSubPart
                command_list: (CommandList children:[(C {(cat)} {($ VSub_Name '$flock')})])
                left_token: <Left_CommandSub '$('>
                spids: [1180 1184]
              ) (' ') ($ VSub_Name '$flock')
            )
          }
        )
      ]
    )
    (AndOr
      ops: [Op_DPipe]
      children: [
        (SimpleCommand
          words: [{(echo)} {($ VSub_Dollar '$$')}]
          redirects: [
            (Redir
              op_id: Redir_Great
              fd: 16777215
              arg_word: {($ VSub_Name '$flock')}
              spids: [1193]
            )
          ]
        )
        (C {(die)} {(DQ ('ERROR: unable to write ') ($ VSub_Name '$flock') (.))})
      ]
    )
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:wroteflock) op:Equal rhs:{(1)} spids:[1207])]
      spids: [1207]
    )
    (SimpleCommand
      words: [{(echo)} {(nop)}]
      redirects: [(Redir op_id:Redir_Great fd:16777215 arg_word:{(current_tracer)} spids:[1218])]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (Pipeline
                  children: [
                    (SimpleCommand
                      words: [{(echo)} {(DQ ($ VSub_Name '$kprobe'))}]
                      redirects: [
                        (Redir
                          op_id: Redir_DGreat
                          fd: 16777215
                          arg_word: {(kprobe_events)}
                          spids: [1232]
                        )
                      ]
                    )
                  ]
                  negated: T
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (SimpleCommand
              words: [
                {(echo)}
                {
                  (DQ ('ERROR: adding kprobe ') (EscapedLiteralPart token:<Lit_EscapedChar '\\"'>) 
                    ($ VSub_Name '$kprobe') (EscapedLiteralPart token:<Lit_EscapedChar '\\"'>) (.)
                  )
                }
              ]
              redirects: [(Redir op_id:Redir_GreatAnd fd:16777215 arg_word:{(2)} spids:[1242])]
            )
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (DParen child:(ArithVarRef name:dmesg))
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (SimpleCommand
                      words: [
                        {(echo)}
                        {
                          (DQ ('Last ') ($ VSub_Name '$dmesg') 
                            (' dmesg entries (might contain reason):')
                          )
                        }
                      ]
                      redirects: [
                        (Redir
                          op_id: Redir_GreatAnd
                          fd: 16777215
                          arg_word: {(2)}
                          spids: [1269]
                        )
                      ]
                    )
                    (Pipeline
                      children: [
                        (C {(dmesg)})
                        (C {(tail)} {(-) ($ VSub_Name '$dmesg')})
                        (C {(sed)} {(SQ <'s/^/    /'>)})
                      ]
                      negated: F
                    )
                  ]
                  spids: [16777215 1264]
                )
              ]
              spids: [16777215 1297]
            )
            (C {(edie)} {(DQ (Exiting.))})
          ]
          spids: [16777215 1237]
        )
      ]
      spids: [16777215 1306]
    )
    (If
      arms: [
        (if_arm
          cond: [(Sentence child:(DParen child:(ArithVarRef name:opt_view)) terminator:<Op_Semi ';'>)]
          action: [(C {(cat)} {(events/kprobes/) ($ VSub_Name '$kname') (/format)}) (C {(edie)} {(DQ )})]
          spids: [16777215 1318]
        )
      ]
      spids: [16777215 1333]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: (DParen child:(ArithVarRef name:opt_filter))
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (Pipeline
                          children: [
                            (SimpleCommand
                              words: [{(echo)} {(DQ ($ VSub_Name '$filter'))}]
                              redirects: [
                                (Redir
                                  op_id: Redir_Great
                                  fd: 16777215
                                  arg_word: {(events/kprobes/) ($ VSub_Name '$kname') (/filter)}
                                  spids: [1358]
                                )
                              ]
                            )
                          ]
                          negated: T
                        )
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [(C {(edie)} {(DQ ('ERROR: setting filter or -p. Exiting.'))})]
                  spids: [16777215 1365]
                )
              ]
              spids: [16777215 1375]
            )
          ]
          spids: [16777215 1345]
        )
      ]
      spids: [16777215 1377]
    )
    (If
      arms: [
        (if_arm
          cond: [(Sentence child:(DParen child:(ArithVarRef name:opt_stack)) terminator:<Op_Semi ';'>)]
          action: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (Pipeline
                          children: [
                            (SimpleCommand
                              words: [{(echo)} {(1)}]
                              redirects: [
                                (Redir
                                  op_id: Redir_Great
                                  fd: 16777215
                                  arg_word: {(options/stacktrace)}
                                  spids: [1400]
                                )
                              ]
                            )
                          ]
                          negated: T
                        )
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [(C {(edie)} {(DQ ('ERROR: enabling stack traces (-s). Exiting'))})]
                  spids: [16777215 1405]
                )
              ]
              spids: [16777215 1415]
            )
          ]
          spids: [16777215 1389]
        )
      ]
      spids: [16777215 1417]
    )
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: 
                (Pipeline
                  children: [
                    (SimpleCommand
                      words: [{(echo)} {(1)}]
                      redirects: [
                        (Redir
                          op_id: Redir_Great
                          fd: 16777215
                          arg_word: {(events/kprobes/) ($ VSub_Name '$kname') (/enable)}
                          spids: [1427]
                        )
                      ]
                    )
                  ]
                  negated: T
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [(C {(edie)} {(DQ ('ERROR: enabling kprobe ') ($ VSub_Name '$kname') ('. Exiting.'))})]
          spids: [16777215 1434]
        )
      ]
      spids: [16777215 1445]
    )
    (C {(warn)} {(DQ ('echo > trace'))})
    (If
      arms: [
        (if_arm
          cond: [
            (Sentence
              child: (DParen child:(ArithVarRef name:opt_duration))
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (C {(sleep)} {($ VSub_Name '$duration')})
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (DParen child:(ArithVarRef name:opt_headers))
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [(C {(cat)} {(trace)})]
                  spids: [16777215 1485]
                )
              ]
              else_action: [(C {(grep)} {(-v)} {(SQ <'^#'>)} {(trace)})]
              spids: [1493 1507]
            )
          ]
          spids: [16777215 1467]
        )
      ]
      else_action: [
        (AndOr
          ops: [Op_DAmp]
          children: [(DParen child:(ArithVarRef name:opt_headers)) (C {(cat)} {(trace)})]
        )
        (C {(cat)} {(trace_pipe)})
      ]
      spids: [1509 1534]
    )
    (C {(end)})
  ]
)