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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.
// +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"
exec "golang.org/x/sys/execabs"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"runtime"
"sort"
)
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*)`)
var unsafeSyms = map[string]bool{"Alignof": true, "ArbitraryType": true, "Offsetof": true, "Pointer": true, "Sizeof": true}
func main() {
var buf bytes.Buffer
outf := func(format string, args ...interface{}) {
fmt.Fprintf(&buf, format, args...)
}
outf("// Code generated by mkstdlib.go. DO NOT EDIT.\n\n")
outf("package imports\n")
outf("var stdlib = map[string][]string{\n")
f := io.MultiReader(
mustOpen(api("go1.txt")),
mustOpen(api("go1.1.txt")),
mustOpen(api("go1.2.txt")),
mustOpen(api("go1.3.txt")),
mustOpen(api("go1.4.txt")),
mustOpen(api("go1.5.txt")),
mustOpen(api("go1.6.txt")),
mustOpen(api("go1.7.txt")),
mustOpen(api("go1.8.txt")),
mustOpen(api("go1.9.txt")),
mustOpen(api("go1.10.txt")),
mustOpen(api("go1.11.txt")),
mustOpen(api("go1.12.txt")),
mustOpen(api("go1.13.txt")),
mustOpen(api("go1.14.txt")),
mustOpen(api("go1.15.txt")),
// The API of the syscall/js package needs to be computed explicitly,
// because it's not included in the GOROOT/api/go1.*.txt files at this time.
syscallJSAPI(),
)
sc := bufio.NewScanner(f)
pkgs := map[string]map[string]bool{
"unsafe": unsafeSyms,
}
paths := []string{"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: []string{\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)
}
}
// syscallJSAPI returns the API of the syscall/js package.
// It's computed from the contents of $(go env GOROOT)/src/syscall/js.
func syscallJSAPI() io.Reader {
var exeSuffix string
if runtime.GOOS == "windows" {
exeSuffix = ".exe"
}
cmd := exec.Command("go"+exeSuffix, "run", "cmd/api", "-contexts", "js-wasm", "syscall/js")
out, err := cmd.Output()
if err != nil {
log.Fatalln(err)
}
return bytes.NewReader(out)
}
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