cmd/internal/gc: restore mkbuiltin
Change-Id: I6cc4061fef9d3c3530406ab3d4811192b7175e89
Reviewed-on: https://go-review.googlesource.com/6233
Reviewed-by: Minux Ma <minux@golang.org>
diff --git a/src/cmd/internal/gc/mkbuiltin.go b/src/cmd/internal/gc/mkbuiltin.go
new file mode 100644
index 0000000..f32a75b
--- /dev/null
+++ b/src/cmd/internal/gc/mkbuiltin.go
@@ -0,0 +1,104 @@
+// 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", "builtins/"+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")
+}
