コード例 #1
0
ファイル: export.go プロジェクト: ckeyer/gosrc
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)
}
コード例 #2
0
ファイル: ar.go プロジェクト: ckeyer/gosrc
// 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
	}
}
コード例 #3
0
ファイル: obj.go プロジェクト: ckeyer/gosrc
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)
}