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// 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.
package load
import (
"cmd/go/internal/modload"
"errors"
"fmt"
"go/build"
"internal/godebugs"
"sort"
"strconv"
"strings"
)
var ErrNotGoDebug = errors.New("not //go:debug line")
func ParseGoDebug(text string) (key, value string, err error) {
if !strings.HasPrefix(text, "//go:debug") {
return "", "", ErrNotGoDebug
}
i := strings.IndexAny(text, " \t")
if i < 0 {
if strings.TrimSpace(text) == "//go:debug" {
return "", "", fmt.Errorf("missing key=value")
}
return "", "", ErrNotGoDebug
}
k, v, ok := strings.Cut(strings.TrimSpace(text[i:]), "=")
if !ok {
return "", "", fmt.Errorf("missing key=value")
}
if strings.ContainsAny(k, " \t") {
return "", "", fmt.Errorf("key contains space")
}
if strings.ContainsAny(v, " \t") {
return "", "", fmt.Errorf("value contains space")
}
if strings.ContainsAny(k, ",") {
return "", "", fmt.Errorf("key contains comma")
}
if strings.ContainsAny(v, ",") {
return "", "", fmt.Errorf("value contains comma")
}
for _, info := range godebugs.All {
if k == info.Name {
return k, v, nil
}
}
return "", "", fmt.Errorf("unknown //go:debug setting %q", k)
}
// defaultGODEBUG returns the default GODEBUG setting for the main package p.
// When building a test binary, directives, testDirectives, and xtestDirectives
// list additional directives from the package under test.
func defaultGODEBUG(p *Package, directives, testDirectives, xtestDirectives []build.Directive) string {
if p.Name != "main" {
return ""
}
goVersion := modload.MainModules.GoVersion()
if modload.RootMode == modload.NoRoot && p.Module != nil {
// This is go install pkg@version or go run pkg@version.
// Use the Go version from the package.
// If there isn't one, then
goVersion = p.Module.GoVersion
if goVersion == "" {
goVersion = "1.20"
}
}
m := godebugForGoVersion(goVersion)
for _, list := range [][]build.Directive{p.Internal.Build.Directives, directives, testDirectives, xtestDirectives} {
for _, d := range list {
k, v, err := ParseGoDebug(d.Text)
if err != nil {
continue
}
if m == nil {
m = make(map[string]string)
}
m[k] = v
}
}
var keys []string
for k := range m {
keys = append(keys, k)
}
sort.Strings(keys)
var b strings.Builder
for _, k := range keys {
if b.Len() > 0 {
b.WriteString(",")
}
b.WriteString(k)
b.WriteString("=")
b.WriteString(m[k])
}
return b.String()
}
func godebugForGoVersion(v string) map[string]string {
if strings.Count(v, ".") >= 2 {
i := strings.Index(v, ".")
j := i + 1 + strings.Index(v[i+1:], ".")
v = v[:j]
}
if !strings.HasPrefix(v, "1.") {
return nil
}
n, err := strconv.Atoi(v[len("1."):])
if err != nil {
return nil
}
def := make(map[string]string)
for _, info := range godebugs.All {
if n < info.Changed {
def[info.Name] = info.Old
}
}
return def
}