(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:tracing)
          op: assign_op.Equal
          rhs: {<'/sys/kernel/debug/tracing'>}
          spids: [202]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:flock)
          op: assign_op.Equal
          rhs: {<'/var/tmp/.ftrace-lock'>}
          spids: [205]
        )
      ]
    )
    (command.CommandList
      children: [
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_duration)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [208]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:duration)
                  op: assign_op.Equal
                  rhs: (word.Empty)
                  spids: [212]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_pid)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [215]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:pid)
                  op: assign_op.Equal
                  rhs: (word.Empty)
                  spids: [219]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_tid)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [222]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:tid)
                  op: assign_op.Equal
                  rhs: (word.Empty)
                  spids: [226]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:pidtext)
              op: assign_op.Equal
              rhs: (word.Empty)
              spids: [229]
            )
          ]
        )
      ]
    )
    (command.CommandList
      children: [
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_headers)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [231]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_proc)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [235]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_time)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [239]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_tail)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [243]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_nodur)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [247]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:opt_cpu)
              op: assign_op.Equal
              rhs: {<0>}
              spids: [251]
            )
          ]
        )
      ]
    )
    (command.CommandList
      children: [
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:opt_max)
                  op: assign_op.Equal
                  rhs: {<0>}
                  spids: [254]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:max)
              op: assign_op.Equal
              rhs: {<0>}
              spids: [258]
            )
          ]
        )
      ]
    )
    (C {<trap>} {(SQ <':'>)} {<INT>} {<QUIT>} {<TERM>} {<PIPE>} {<HUP>})
    (command.ShFunction
      name: usage
      body: 
        (BraceGroup
          children: [
            (command.Simple
              words: [{<cat>}]
              redirects: [
                (redir
                  op: <Id.Redir_DLessDash '<<-'>
                  loc: (redir_loc.Fd fd:0)
                  arg: 
                    (redir_param.MultiLine
                      here_begin: {<END>}
                      here_end_span_id: 318
                      stdin_parts: [
                        <
'USAGE: funcgraph [-aCDhHPtT] [-m maxdepth] [-p PID] [-L TID] [-d secs] funcstring\n'
                        >
                        <'                 -a              # all info (same as -HPt)\n'>
                        <'                 -C              # measure on-CPU time only\n'>
                        <'                 -d seconds      # trace duration, and use buffers\n'>
                        <'                 -D              # do not show function duration\n'>
                        <'                 -h              # this usage message\n'>
                        <'                 -H              # include column headers\n'>
                        <'                 -m maxdepth     # max stack depth to show\n'>
                        <'                 -p PID          # trace when this pid is on-CPU\n'>
                        <'                 -L TID          # trace when this thread is on-CPU\n'>
                        <'                 -P              # show process names & PIDs\n'>
                        <'                 -t              # show timestamps\n'>
                        <'                 -T              # comment function tails\n'>
                        <'  eg,\n'>
                        <'       funcgraph do_nanosleep    # trace do_nanosleep() and children\n'>
                        <
'       funcgraph -m 3 do_sys_open # trace do_sys_open() to 3 levels only\n'
                        >
                        <
'       funcgraph -a do_sys_open    # include timestamps and process name\n'
                        >
                        <
'       funcgraph -p 198 do_sys_open # trace vfs_read() for PID 198 only\n'
                        >
                        <
'       funcgraph -d 1 do_sys_open >out # trace 1 sec, then write to file\n'
                        >
                        <'\n'>
                        <'See the man page and example file for more info.\n'>
                      ]
                    )
                )
                (redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})
              ]
              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit>)
          ]
        )
    )
    (command.ShFunction
      name: warn
      body: 
        (BraceGroup
          children: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [(C {<eval>} {(DQ ($ Id.VSub_At '$@'))})]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.Simple
                      words: [
                        {<echo>}
                        {
                          (DQ <'WARNING: command failed '> 
                            (word_part.EscapedLiteral
                              token: <Id.Lit_EscapedChar '\\"'>
                            ) ($ Id.VSub_At '$@') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>)
                          )
                        }
                      ]
                      redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                      do_fork: T
                    )
                  ]
                  spids: [332 343]
                )
              ]
            )
          ]
        )
    )
    (command.ShFunction
      name: end
      body: 
        (BraceGroup
          children: [
            (command.Simple
              words: [{<echo>}]
              redirects: [(redir op:<Id.Redir_Great '2>'> loc:(redir_loc.Fd fd:2) arg:{<'/dev/null'>})]
              do_fork: T
            )
            (command.Simple
              words: [{<echo>} {(DQ <'Ending tracing...'>)}]
              redirects: [(redir op:<Id.Redir_Great '2>'> loc:(redir_loc.Fd fd:2) arg:{<'/dev/null'>})]
              do_fork: T
            )
            (C {<cd>} {($ Id.VSub_DollarName '$tracing')})
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_time>)
                (C {<warn>} {(DQ <'echo nofuncgraph-abstime > trace_options'>)})
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_proc>)
                (C {<warn>} {(DQ <'echo nofuncgraph-proc > trace_options'>)})
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_tail>)
                (C {<warn>} {(DQ <'echo nofuncgraph-tail > trace_options'>)})
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_nodur>)
                (C {<warn>} {(DQ <'echo funcgraph-duration > trace_options'>)})
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_cpu>)
                (C {<warn>} {(DQ <'echo sleep-time > trace_options'>)})
              ]
            )
            (C {<warn>} {(DQ <'echo nop > current_tracer'>)})
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen
                  child: 
                    (arith_expr.Binary
                      op_id: Id.Arith_DPipe
                      left: <Id.Lit_ArithVarLike opt_pid>
                      right: <Id.Lit_ArithVarLike opt_tid>
                    )
                )
                (C {<warn>} {(DQ <'echo > set_ftrace_pid'>)})
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike opt_max>)
                (C {<warn>} {(DQ <'echo 0 > max_graph_depth'>)})
              ]
            )
            (C {<warn>} {(DQ <'echo > set_graph_function'>)})
            (C {<warn>} {(DQ <'echo > trace'>)})
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike wroteflock>)
                (C {<warn>} {(DQ <'rm '> ($ Id.VSub_DollarName '$flock'))})
              ]
            )
          ]
        )
    )
    (command.ShFunction
      name: die
      body: 
        (BraceGroup
          children: [
            (command.Simple
              words: [{<echo>} {(DQ ($ Id.VSub_At '$@'))}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
        )
    )
    (command.ShFunction
      name: edie
      body: 
        (BraceGroup
          children: [
            (command.Simple
              words: [{<echo>} {(DQ ($ Id.VSub_At '$@'))}]
              redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
              do_fork: T
            )
            (command.Simple
              words: [{<exec>}]
              redirects: [
                (redir
                  op: <Id.Redir_Great '>'>
                  loc: (redir_loc.Fd fd:1)
                  arg: {<'/dev/null'>}
                )
                (redir op:<Id.Redir_GreatAnd '2>&'> loc:(redir_loc.Fd fd:2) arg:{<1>})
              ]
              do_fork: T
            )
            (C {<end>})
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
        )
    )
    (command.WhileUntil
      keyword: <Id.KW_While while>
      cond: [
        (C {<getopts>} 
          {<aCd> <Id.Lit_Colon ':'> <DhHm> <Id.Lit_Colon ':'> <p> <Id.Lit_Colon ':'> <L> <Id.Lit_Colon ':'> 
            <PtT>
          } {<opt>}
        )
      ]
      body: 
        (command.DoGroup
          children: [
            (command.Case
              to_match: {($ Id.VSub_DollarName '$opt')}
              arms: [
                (case_arm
                  pat_list: [{<a>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_headers)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [651]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_proc)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [655]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:opt_time)
                          op: assign_op.Equal
                          rhs: {<1>}
                          spids: [659]
                        )
                      ]
                    )
                  ]
                  spids: [648 649 662 -1]
                )
                (case_arm
                  pat_list: [{<C>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_cpu)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [668]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [665 666 672 -1]
                )
                (case_arm
                  pat_list: [{<d>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_duration)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [678]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:duration)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_DollarName '$OPTARG')}
                          spids: [682]
                        )
                      ]
                    )
                  ]
                  spids: [675 676 685 -1]
                )
                (case_arm
                  pat_list: [{<D>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_nodur)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [691]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [688 689 695 -1]
                )
                (case_arm
                  pat_list: [{<m>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_max)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [701]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:max)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_DollarName '$OPTARG')}
                          spids: [705]
                        )
                      ]
                    )
                  ]
                  spids: [698 699 708 -1]
                )
                (case_arm
                  pat_list: [{<p>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_pid)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [714]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:pid)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_DollarName '$OPTARG')}
                          spids: [718]
                        )
                      ]
                    )
                  ]
                  spids: [711 712 721 -1]
                )
                (case_arm
                  pat_list: [{<L>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_tid)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [727]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:tid)
                          op: assign_op.Equal
                          rhs: {($ Id.VSub_DollarName '$OPTARG')}
                          spids: [731]
                        )
                      ]
                    )
                  ]
                  spids: [724 725 734 -1]
                )
                (case_arm
                  pat_list: [{<H>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_headers)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [740]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [737 738 744 -1]
                )
                (case_arm
                  pat_list: [{<P>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_proc)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [750]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [747 748 754 -1]
                )
                (case_arm
                  pat_list: [{<t>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_time)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [760]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [757 758 764 -1]
                )
                (case_arm
                  pat_list: [{<T>}]
                  action: [
                    (command.Sentence
                      child: 
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:opt_tail)
                              op: assign_op.Equal
                              rhs: {<1>}
                              spids: [770]
                            )
                          ]
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  spids: [767 768 774 -1]
                )
                (case_arm
                  pat_list: [{<h>} {<Id.Lit_QMark '?'>}]
                  action: [(C {<usage>})]
                  spids: [777 780 784 -1]
                )
              ]
            )
          ]
        )
    )
    (C {<shift>} 
      {
        (word_part.ArithSub
          anode: 
            (arith_expr.Binary
              op_id: Id.Arith_Minus
              left: {($ Id.VSub_DollarName '$OPTIND')}
              right: {<Id.Lit_Digits 1>}
            )
        )
      }
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DParen
          child: 
            (arith_expr.Binary
              op_id: Id.Arith_DEqual
              left: {($ Id.VSub_Pound '$#')}
              right: {<Id.Lit_Digits 0>}
            )
        )
        (C {<usage>})
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DParen
          child: 
            (arith_expr.Binary
              op_id: Id.Arith_DAmp
              left: <Id.Lit_ArithVarLike opt_pid>
              right: <Id.Lit_ArithVarLike opt_tid>
            )
        )
        (C {<edie>} {(DQ <'ERROR: You can use -p or -L but not both.'>)})
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:funcs)
          op: assign_op.Equal
          rhs: {(DQ ($ Id.VSub_Number '$1'))}
          spids: [842]
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DParen child:<Id.Lit_ArithVarLike opt_pid>)
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:pidtext)
              op: assign_op.Equal
              rhs: {(DQ <' for PID '> ($ Id.VSub_DollarName '$pid'))}
              spids: [856]
            )
          ]
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DParen child:<Id.Lit_ArithVarLike opt_tid>)
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:pidtext)
              op: assign_op.Equal
              rhs: {(DQ <' for TID '> ($ Id.VSub_DollarName '$tid'))}
              spids: [871]
            )
          ]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_duration>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (C {<echo>} 
              {
                (DQ <'Tracing '> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) 
                  ($ Id.VSub_DollarName '$funcs') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) ($ Id.VSub_DollarName '$pidtext') <' for '> 
                  ($ Id.VSub_DollarName '$duration') <' seconds...'>
                )
              }
            )
          ]
          spids: [877 887]
        )
      ]
      else_action: [
        (C {<echo>} 
          {
            (DQ <'Tracing '> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) 
              ($ Id.VSub_DollarName '$funcs') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) ($ Id.VSub_DollarName '$pidtext') 
              <'... Ctrl-C to end.'>
            )
          }
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (C {<cd>} {($ Id.VSub_DollarName '$tracing')})
        (C {<die>} 
          {
            (DQ <'ERROR: accessing tracing. Root user? Kernel has FTRACE?\n'> 
              <'    debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)'>
            )
          }
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DBracket
          expr: (bool_expr.Unary op_id:Id.BoolUnary_e child:{($ Id.VSub_DollarName '$flock')})
        )
        (C {<die>} 
          {
            (DQ <'ERROR: ftrace may be in use by PID '> 
              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                child: (C {<cat>} {($ Id.VSub_DollarName '$flock')})
              ) <' '> ($ Id.VSub_DollarName '$flock')
            )
          }
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (command.Simple
          words: [{<echo>} {($ Id.VSub_Dollar '$$')}]
          redirects: [
            (redir
              op: <Id.Redir_Great '>'>
              loc: (redir_loc.Fd fd:1)
              arg: {($ Id.VSub_DollarName '$flock')}
            )
          ]
          do_fork: T
        )
        (C {<die>} {(DQ <'ERROR: unable to write '> ($ Id.VSub_DollarName '$flock') <.>)})
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:wroteflock)
          op: assign_op.Equal
          rhs: {<1>}
          spids: [981]
        )
      ]
    )
    (C {<sysctl>} {<-q>} {<kernel.ftrace_enabled> <Id.Lit_Equals '='> <1>})
    (command.Simple
      words: [{<read>} {<mode>}]
      redirects: [(redir op:<Id.Redir_Less '<'> loc:(redir_loc.Fd fd:0) arg:{<current_tracer>})]
      do_fork: T
    )
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (command.DBracket
          expr: 
            (bool_expr.Binary
              op_id: Id.BoolBinary_GlobNEqual
              left: {(DQ ($ Id.VSub_DollarName '$mode'))}
              right: {(DQ <nop>)}
            )
        )
        (C {<edie>} 
          {(DQ <'ERROR: ftrace active (current_tracer='> ($ Id.VSub_DollarName '$mode') <')'>)}
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_max>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {($ Id.VSub_DollarName '$max')}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<max_graph_depth>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (C {<edie>} 
                      {
                        (DQ <'ERROR: setting -m '> ($ Id.VSub_DollarName '$max') 
                          <'. Older kernel version? Exiting.'>
                        )
                      }
                    )
                  ]
                  spids: [1044 1057]
                )
              ]
            )
          ]
          spids: [1031 1041]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_pid>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.Simple
              words: [{<echo>}]
              redirects: [
                (redir
                  op: <Id.Redir_Great '>'>
                  loc: (redir_loc.Fd fd:1)
                  arg: {<set_ftrace_pid>}
                )
              ]
              do_fork: T
            )
            (command.ForEach
              iter_name: tid
              iter_words: [{<'/proc/'> ($ Id.VSub_DollarName '$pid') <'/task/'> <Id.Lit_Star '*'>}]
              do_arg_iter: F
              body: 
                (command.DoGroup
                  children: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.Pipeline
                                  children: [
                                    (command.Simple
                                      words: [
                                        {<echo>}
                                        {
                                          (braced_var_sub
                                            token: <Id.VSub_Name tid>
                                            suffix_op: 
                                              (suffix_op.Unary
                                                op_id: Id.VOp1_DPound
                                                arg_word: {<'*'> <Id.Lit_Slash '/'>}
                                              )
                                          )
                                        }
                                      ]
                                      redirects: [
                                        (redir
                                          op: <Id.Redir_DGreat '>>'>
                                          loc: (redir_loc.Fd fd:1)
                                          arg: {<set_ftrace_pid>}
                                        )
                                      ]
                                      do_fork: T
                                    )
                                  ]
                                  negated: T
                                )
                              terminator: <Id.Op_Semi _>
                            )
                          ]
                          action: [
                            (C {<edie>} 
                              {
                                (DQ <'ERROR: setting -p '> ($ Id.VSub_DollarName '$pid') 
                                  <' (PID exist?). Exiting.'>
                                )
                              }
                            )
                          ]
                          spids: [1112 1130]
                        )
                      ]
                    )
                  ]
                )
            )
          ]
          spids: [1073 1083]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_tid>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {($ Id.VSub_DollarName '$tid')}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<set_ftrace_pid>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (C {<edie>} 
                      {
                        (DQ <'ERROR: setting -L '> ($ Id.VSub_DollarName '$tid') 
                          <' (TID exist?). Exiting.'>
                        )
                      }
                    )
                  ]
                  spids: [1162 1175]
                )
              ]
            )
          ]
          spids: [1149 1159]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.Pipeline
                  children: [
                    (command.Simple
                      words: [{<echo>}]
                      redirects: [
                        (redir
                          op: <Id.Redir_Great '>'>
                          loc: (redir_loc.Fd fd:1)
                          arg: {<set_ftrace_filter>}
                        )
                      ]
                      do_fork: T
                    )
                  ]
                  negated: T
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [(C {<edie>} {(DQ <'ERROR: writing to set_ftrace_filter. Exiting.'>)})]
          spids: [1191 1202]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.Pipeline
                  children: [
                    (command.Simple
                      words: [{<echo>} {(DQ ($ Id.VSub_DollarName '$funcs'))}]
                      redirects: [
                        (redir
                          op: <Id.Redir_Great '>'>
                          loc: (redir_loc.Fd fd:1)
                          arg: {<set_graph_function>}
                        )
                      ]
                      do_fork: T
                    )
                  ]
                  negated: T
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (C {<edie>} 
              {
                (DQ <'ERROR: enabling '> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) 
                  ($ Id.VSub_DollarName '$funcs') (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <'. Exiting.'>
                )
              }
            )
          ]
          spids: [1213 1228]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.Pipeline
                  children: [
                    (command.Simple
                      words: [{<echo>} {<function_graph>}]
                      redirects: [
                        (redir
                          op: <Id.Redir_Great '>'>
                          loc: (redir_loc.Fd fd:1)
                          arg: {<current_tracer>}
                        )
                      ]
                      do_fork: T
                    )
                  ]
                  negated: T
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (C {<edie>} 
              {
                (DQ <'ERROR: setting current_tracer to '> 
                  (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <function> (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <'. Exiting.'>
                )
              }
            )
          ]
          spids: [1243 1256]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_cpu>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {<nosleep-time>}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<trace_options>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [(C {<edie>} {(DQ <'ERROR: setting -C (nosleep-time). Exiting.'>)})]
                  spids: [1284 1297]
                )
              ]
            )
          ]
          spids: [1271 1281]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_time>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {<funcgraph-abstime>}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<trace_options>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [(C {<edie>} {(DQ <'ERROR: setting -t (funcgraph-abstime). Exiting.'>)})]
                  spids: [1327 1340]
                )
              ]
            )
          ]
          spids: [1314 1324]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_proc>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {<funcgraph-proc>}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<trace_options>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [(C {<edie>} {(DQ <'ERROR: setting -P (funcgraph-proc). Exiting.'>)})]
                  spids: [1367 1380]
                )
              ]
            )
          ]
          spids: [1354 1364]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_tail>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {<funcgraph-tail>}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<trace_options>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (C {<edie>} {(DQ <'ERROR: setting -T (funcgraph-tail). Old kernel? Exiting.'>)})
                  ]
                  spids: [1407 1420]
                )
              ]
            )
          ]
          spids: [1394 1404]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_nodur>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.Pipeline
                          children: [
                            (command.Simple
                              words: [{<echo>} {<nofuncgraph-duration>}]
                              redirects: [
                                (redir
                                  op: <Id.Redir_Great '>'>
                                  loc: (redir_loc.Fd fd:1)
                                  arg: {<trace_options>}
                                )
                              ]
                              do_fork: T
                            )
                          ]
                          negated: T
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [(C {<edie>} {(DQ <'ERROR: setting -D (nofuncgraph-duration). Exiting.'>)})]
                  spids: [1447 1460]
                )
              ]
            )
          ]
          spids: [1434 1444]
        )
      ]
    )
    (C {<warn>} {(DQ <'echo > trace'>)})
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DParen child:<Id.Lit_ArithVarLike opt_duration>)
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (C {<sleep>} {($ Id.VSub_DollarName '$duration')})
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: (command.DParen child:<Id.Lit_ArithVarLike opt_headers>)
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [(C {<cat>} {<trace>})]
                  spids: [1502 1512]
                )
              ]
              else_action: [(C {<grep>} {<-v>} {(SQ <'^#'>)} {<trace>})]
            )
          ]
          spids: [1484 1494]
        )
      ]
      else_action: [
        (command.AndOr
          ops: [Id.Op_DAmp]
          children: [(command.DParen child:<Id.Lit_ArithVarLike opt_headers>) (C {<cat>} {<trace>})]
        )
        (C {<cat>} {<trace_pipe>})
      ]
    )
    (C {<end>})
  ]
)