blob: b2362a6f01adf6fb268221eea3f5a74e085f5582 [file] [log] [blame]
// Copyright 2009 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
// Generate builtin.go from $* (runtime.go and unsafe.go).
// Run this after changing runtime.go and unsafe.go
// or after changing the export metadata format in the compiler.
// Either way, you need to have a working compiler binary first.
package main
import (
"bufio"
"fmt"
"go/build"
"io"
"log"
"os"
"os/exec"
"runtime"
"strings"
)
func main() {
gochar, err := build.ArchChar(runtime.GOARCH)
if err != nil {
log.Fatal(err)
}
f, err := os.Create("builtin.go")
if err != nil {
log.Fatal(err)
}
defer f.Close()
w := bufio.NewWriter(f)
fmt.Fprintln(w, "// AUTO-GENERATED by mkbuiltin.go; DO NOT EDIT")
fmt.Fprintln(w, "")
fmt.Fprintln(w, "package gc")
for _, name := range os.Args[1:] {
mkbuiltin(w, gochar, name)
}
if err := w.Flush(); err != nil {
log.Fatal(err)
}
}
// Compile .go file, import data from .6 file, and write Go string version.
func mkbuiltin(w io.Writer, gochar string, name string) {
if err := exec.Command("go", "tool", gochar+"g", "-A", "builtin/"+name+".go").Run(); err != nil {
log.Fatal(err)
}
obj := fmt.Sprintf("%s.%s", name, gochar)
defer os.Remove(obj)
r, err := os.Open(obj)
if err != nil {
log.Fatal(err)
}
defer r.Close()
scanner := bufio.NewScanner(r)
// Look for $$ that introduces imports.
for scanner.Scan() {
if strings.Contains(scanner.Text(), "$$") {
goto Begin
}
}
log.Fatal("did not find beginning of imports")
Begin:
initfunc := fmt.Sprintf("init_%s_function", name)
fmt.Fprintf(w, "\nconst %simport = \"\" +\n", name)
// sys.go claims to be in package PACKAGE to avoid
// conflicts during "6g sys.go". Rename PACKAGE to $2.
replacer := strings.NewReplacer("PACKAGE", name)
// Process imports, stopping at $$ that closes them.
for scanner.Scan() {
p := scanner.Text()
if strings.Contains(p, "$$") {
goto End
}
// Chop leading white space.
p = strings.TrimLeft(p, " \t")
// Cut out decl of init_$1_function - it doesn't exist.
if strings.Contains(p, initfunc) {
continue
}
fmt.Fprintf(w, "\t%q +\n", replacer.Replace(p)+"\n")
}
log.Fatal("did not find end of imports")
End:
fmt.Fprintf(w, "\t\"$$\\n\"\n")
}