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// Copyright 2019 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.
//go:build ignore
// +build ignore
// mkstdlib generates the zstdlib.go file, containing the Go standard
// library API symbols. It's baked into the binary to avoid scanning
// GOPATH in the common case.
package main
import (
"bufio"
"bytes"
"fmt"
"go/format"
"go/token"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"runtime"
"sort"
"strings"
"golang.org/x/tools/go/packages"
)
func mustOpen(name string) io.Reader {
f, err := os.Open(name)
if err != nil {
log.Fatal(err)
}
return f
}
func api(base string) string {
return filepath.Join(runtime.GOROOT(), "api", base)
}
var sym = regexp.MustCompile(`^pkg (\S+).*?, (?:var|func|type|const) ([A-Z]\w*)`)
func main() {
var buf bytes.Buffer
outf := func(format string, args ...interface{}) {
fmt.Fprintf(&buf, format, args...)
}
outf(`// Copyright 2022 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.
`)
outf("// Code generated by mkstdlib.go. DO NOT EDIT.\n\n")
outf("package imports\n")
outf("var stdlib = map[string][]string{\n")
f := readAPI()
sc := bufio.NewScanner(f)
// The APIs of the syscall/js and unsafe packages need to be computed explicitly,
// because they're not included in the GOROOT/api/go1.*.txt files at this time.
pkgs := map[string]map[string]bool{
"syscall/js": syms("syscall/js", "GOOS=js", "GOARCH=wasm"),
"unsafe": syms("unsafe"),
}
paths := []string{"syscall/js", "unsafe"}
for sc.Scan() {
l := sc.Text()
if m := sym.FindStringSubmatch(l); m != nil {
path, sym := m[1], m[2]
if _, ok := pkgs[path]; !ok {
pkgs[path] = map[string]bool{}
paths = append(paths, path)
}
pkgs[path][sym] = true
}
}
if err := sc.Err(); err != nil {
log.Fatal(err)
}
sort.Strings(paths)
for _, path := range paths {
outf("\t%q: {\n", path)
pkg := pkgs[path]
var syms []string
for sym := range pkg {
syms = append(syms, sym)
}
sort.Strings(syms)
for _, sym := range syms {
outf("\t\t%q,\n", sym)
}
outf("},\n")
}
outf("}\n")
fmtbuf, err := format.Source(buf.Bytes())
if err != nil {
log.Fatal(err)
}
err = ioutil.WriteFile("zstdlib.go", fmtbuf, 0666)
if err != nil {
log.Fatal(err)
}
}
// readAPI opens an io.Reader that reads all stdlib API content.
func readAPI() io.Reader {
entries, err := os.ReadDir(filepath.Join(runtime.GOROOT(), "api"))
if err != nil {
log.Fatal(err)
}
var readers []io.Reader
for _, entry := range entries {
name := entry.Name()
if strings.HasPrefix(name, "go") && strings.HasSuffix(name, ".txt") {
readers = append(readers, mustOpen(api(name)))
}
}
return io.MultiReader(readers...)
}
// syms computes the exported symbols in the specified package.
func syms(pkg string, extraEnv ...string) map[string]bool {
var env []string
if len(extraEnv) != 0 {
env = append(os.Environ(), extraEnv...)
}
pkgs, err := packages.Load(&packages.Config{Mode: packages.NeedTypes, Env: env}, pkg)
if err != nil {
log.Fatalln(err)
} else if len(pkgs) != 1 {
log.Fatalf("got %d packages, want one package %q", len(pkgs), pkg)
}
syms := make(map[string]bool)
for _, name := range pkgs[0].Types.Scope().Names() {
if token.IsExported(name) {
syms[name] = true
}
}
return syms
}
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