blob: 1dc0dcda1532eeceb870cf715eb323199221267a [file] [log] [blame]
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Code generated by "gen.bash" from internal/trace/v2; DO NOT EDIT.
//go:build go1.21
package version
import (
// Version represents the version of a trace file.
type Version uint32
const (
Go111 Version = 11
Go119 Version = 19
Go121 Version = 21
Go122 Version = 22
Go123 Version = 23
Current = Go123
var versions = map[Version][]event.Spec{
// Go 1.11–1.21 use a different parser and are only set here for the sake of
// Version.Valid.
Go111: nil,
Go119: nil,
Go121: nil,
Go122: go122.Specs(),
// Go 1.23 adds backwards-incompatible events, but
// traces produced by Go 1.22 are also always valid
// Go 1.23 traces.
Go123: go122.Specs(),
// Specs returns the set of event.Specs for this version.
func (v Version) Specs() []event.Spec {
return versions[v]
func (v Version) Valid() bool {
_, ok := versions[v]
return ok
// headerFmt is the format of the header of all Go execution traces.
const headerFmt = "go 1.%d trace\x00\x00\x00"
// ReadHeader reads the version of the trace out of the trace file's
// header, whose prefix must be present in v.
func ReadHeader(r io.Reader) (Version, error) {
var v Version
_, err := fmt.Fscanf(r, headerFmt, &v)
if err != nil {
return v, fmt.Errorf("bad file format: not a Go execution trace?")
if !v.Valid() {
return v, fmt.Errorf("unknown or unsupported trace version go 1.%d", v)
return v, nil
// WriteHeader writes a header for a trace version v to w.
func WriteHeader(w io.Writer, v Version) (int, error) {
return fmt.Fprintf(w, headerFmt, v)