event.go

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package raw
     6  
     7  import (
     8  	"strconv"
     9  	"strings"
    10  
    11  	"internal/trace/event"
    12  	"internal/trace/version"
    13  )
    14  
    15  // Event is a simple representation of a trace event.
    16  //
    17  // Note that this typically includes much more than just
    18  // timestamped events, and it also represents parts of the
    19  // trace format's framing. (But not interpreted.)
    20  type Event struct {
    21  	Version version.Version
    22  	Ev      event.Type
    23  	Args    []uint64
    24  	Data    []byte
    25  }
    26  
    27  // String returns the canonical string representation of the event.
    28  //
    29  // This format is the same format that is parsed by the TextReader
    30  // and emitted by the TextWriter.
    31  func (e *Event) String() string {
    32  	spec := e.Version.Specs()[e.Ev]
    33  
    34  	var s strings.Builder
    35  	s.WriteString(spec.Name)
    36  	for i := range spec.Args {
    37  		s.WriteString(" ")
    38  		s.WriteString(spec.Args[i])
    39  		s.WriteString("=")
    40  		s.WriteString(strconv.FormatUint(e.Args[i], 10))
    41  	}
    42  	if spec.IsStack {
    43  		frames := e.Args[len(spec.Args):]
    44  		for i := 0; i < len(frames); i++ {
    45  			if i%4 == 0 {
    46  				s.WriteString("\n\t")
    47  			} else {
    48  				s.WriteString(" ")
    49  			}
    50  			s.WriteString(frameFields[i%4])
    51  			s.WriteString("=")
    52  			s.WriteString(strconv.FormatUint(frames[i], 10))
    53  		}
    54  	}
    55  	if e.Data != nil {
    56  		s.WriteString("\n\tdata=")
    57  		s.WriteString(strconv.Quote(string(e.Data)))
    58  	}
    59  	return s.String()
    60  }
    61
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