func dumpasmhdr() {
var b *obj.Biobuf
b, err := obj.Bopenw(asmhdr)
if err != nil {
Fatalf("%v", err)
}
fmt.Fprintf(b, "// generated by %cg -asmhdr from package %s\n\n", Thearch.Thechar, localpkg.Name)
var n *Node
var t *Type
for l := asmlist; l != nil; l = l.Next {
n = l.N
if isblanksym(n.Sym) {
continue
}
switch n.Op {
case OLITERAL:
fmt.Fprintf(b, "#define const_%s %v\n", n.Sym.Name, Vconv(n.Val(), obj.FmtSharp))
case OTYPE:
t = n.Type
if t.Etype != TSTRUCT || t.Map != nil || t.Funarg {
break
}
fmt.Fprintf(b, "#define %s__size %d\n", t.Sym.Name, int(t.Width))
for t = t.Type; t != nil; t = t.Down {
if !isblanksym(t.Sym) {
fmt.Fprintf(b, "#define %s_%s %d\n", n.Sym.Name, t.Sym.Name, int(t.Width))
}
}
}
}
obj.Bterm(b)
}
// hostArchive reads an archive file holding host objects and links in
// required objects. The general format is the same as a Go archive
// file, but it has an armap listing symbols and the objects that
// define them. This is used for the compiler support library
// libgcc.a.
func hostArchive(name string) {
f, err := obj.Bopenr(name)
if err != nil {
if os.IsNotExist(err) {
// It's OK if we don't have a libgcc file at all.
if Debug['v'] != 0 {
fmt.Fprintf(&Bso, "skipping libgcc file: %v\n", err)
}
return
}
Exitf("cannot open file %s: %v", name, err)
}
defer obj.Bterm(f)
magbuf := make([]byte, len(ARMAG))
if obj.Bread(f, magbuf) != len(magbuf) {
Exitf("file %s too short", name)
}
var arhdr ArHdr
l := nextar(f, obj.Boffset(f), &arhdr)
if l <= 0 {
Exitf("%s missing armap", name)
}
var armap archiveMap
if arhdr.name == "/" || arhdr.name == "/SYM64/" {
armap = readArmap(name, f, arhdr)
} else {
Exitf("%s missing armap", name)
}
loaded := make(map[uint64]bool)
any := true
for any {
var load []uint64
for s := Ctxt.Allsym; s != nil; s = s.Allsym {
for _, r := range s.R {
if r.Sym != nil && r.Sym.Type&obj.SMASK == obj.SXREF {
if off := armap[r.Sym.Name]; off != 0 && !loaded[off] {
load = append(load, off)
loaded[off] = true
}
}
}
}
for _, off := range load {
l := nextar(f, int64(off), &arhdr)
if l <= 0 {
Exitf("%s missing archive entry at offset %d", name, off)
}
pname := fmt.Sprintf("%s(%s)", name, arhdr.name)
l = atolwhex(arhdr.size)
h := ldobj(f, "libgcc", l, pname, name, ArchiveObj)
obj.Bseek(f, h.off, 0)
h.ld(f, h.pkg, h.length, h.pn)
}
any = len(load) > 0
}
}
func dumpobj() {
var err error
bout, err = obj.Bopenw(outfile)
if err != nil {
Flusherrors()
fmt.Printf("can't create %s: %v\n", outfile, err)
errorexit()
}
startobj := int64(0)
var arhdr [ArhdrSize]byte
if writearchive != 0 {
obj.Bwritestring(bout, "!<arch>\n")
arhdr = [ArhdrSize]byte{}
bout.Write(arhdr[:])
startobj = obj.Boffset(bout)
}
fmt.Fprintf(bout, "go object %s %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring())
dumpexport()
if writearchive != 0 {
bout.Flush()
size := obj.Boffset(bout) - startobj
if size&1 != 0 {
obj.Bputc(bout, 0)
}
obj.Bseek(bout, startobj-ArhdrSize, 0)
formathdr(arhdr[:], "__.PKGDEF", size)
bout.Write(arhdr[:])
bout.Flush()
obj.Bseek(bout, startobj+size+(size&1), 0)
arhdr = [ArhdrSize]byte{}
bout.Write(arhdr[:])
startobj = obj.Boffset(bout)
fmt.Fprintf(bout, "go object %s %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion(), obj.Expstring())
}
if pragcgobuf != "" {
if writearchive != 0 {
// write empty export section; must be before cgo section
fmt.Fprintf(bout, "\n$$\n\n$$\n\n")
}
fmt.Fprintf(bout, "\n$$ // cgo\n")
fmt.Fprintf(bout, "%s\n$$\n\n", pragcgobuf)
}
fmt.Fprintf(bout, "\n!\n")
externs := len(externdcl)
dumpglobls()
dumptypestructs()
// Dump extra globals.
tmp := externdcl
if externdcl != nil {
externdcl = externdcl[externs:]
}
dumpglobls()
externdcl = tmp
dumpdata()
obj.Writeobjdirect(Ctxt, bout)
if writearchive != 0 {
bout.Flush()
size := obj.Boffset(bout) - startobj
if size&1 != 0 {
obj.Bputc(bout, 0)
}
obj.Bseek(bout, startobj-ArhdrSize, 0)
formathdr(arhdr[:], "_go_.o", size)
bout.Write(arhdr[:])
}
obj.Bterm(bout)
}