Golang obj.Bterm函數代碼示例

func dumpasmhdr() {
	var b *obj.Biobuf

	b, err := obj.Bopenw(asmhdr)
	if err != nil {
		Fatal("%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 != 0 {
				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)
}

func dumpasmhdr() {
	b, err := obj.Bopenw(asmhdr)
	if err != nil {
		Fatalf("%v", err)
	}
	fmt.Fprintf(b, "// generated by compile -asmhdr from package %s\n\n", localpkg.Name)
	for _, n := range asmlist {
		if isblanksym(n.Sym) {
			continue
		}
		switch n.Op {
		case OLITERAL:
			fmt.Fprintf(b, "#define const_%s %v\n", n.Sym.Name, Vconv(n.Val(), 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, it := IterFields(t); t != nil; t = it.Next() {
				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.
			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 unimportfile() {
	if curio.bin != nil {
		obj.Bterm(curio.bin)
		curio.bin = nil
	} else {
		lexlineno-- // re correct sys.6 line number
	}

	curio = pushedio

	pushedio.bin = nil
	incannedimport = 0
	typecheckok = 0
}

func hostobjs() {
	var f *obj.Biobuf
	var h *Hostobj

	for i := 0; i < len(hostobj); i++ {
		h = &hostobj[i]
		var err error
		f, err = obj.Bopenr(h.file)
		if f == nil {
			Exitf("cannot reopen %s: %v", h.pn, err)
		}

		obj.Bseek(f, h.off, 0)
		h.ld(f, h.pkg, h.length, h.pn)
		obj.Bterm(f)
	}
}

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)
}

func objfile(lib *Library) {
	pkg := pathtoprefix(lib.Pkg)

	if Debug['v'] > 1 {
		fmt.Fprintf(&Bso, "%5.2f ldobj: %s (%s)\n", obj.Cputime(), lib.File, pkg)
	}
	Bso.Flush()
	var err error
	var f *obj.Biobuf
	f, err = obj.Bopenr(lib.File)
	if err != nil {
		Exitf("cannot open file %s: %v", lib.File, err)
	}

	magbuf := make([]byte, len(ARMAG))
	if obj.Bread(f, magbuf) != len(magbuf) || !strings.HasPrefix(string(magbuf), ARMAG) {
		/* load it as a regular file */
		l := obj.Bseek(f, 0, 2)

		obj.Bseek(f, 0, 0)
		ldobj(f, pkg, l, lib.File, lib.File, FileObj)
		obj.Bterm(f)

		return
	}

	/* skip over optional __.GOSYMDEF and process __.PKGDEF */
	off := obj.Boffset(f)

	var arhdr ArHdr
	l := nextar(f, off, &arhdr)
	var pname string
	if l <= 0 {
		Diag("%s: short read on archive file symbol header", lib.File)
		goto out
	}

	if strings.HasPrefix(arhdr.name, symname) {
		off += l
		l = nextar(f, off, &arhdr)
		if l <= 0 {
			Diag("%s: short read on archive file symbol header", lib.File)
			goto out
		}
	}

	if !strings.HasPrefix(arhdr.name, pkgname) {
		Diag("%s: cannot find package header", lib.File)
		goto out
	}

	if Buildmode == BuildmodeShared {
		before := obj.Boffset(f)
		pkgdefBytes := make([]byte, atolwhex(arhdr.size))
		obj.Bread(f, pkgdefBytes)
		hash := sha1.Sum(pkgdefBytes)
		lib.hash = hash[:]
		obj.Bseek(f, before, 0)
	}

	off += l

	if Debug['u'] != 0 {
		ldpkg(f, pkg, atolwhex(arhdr.size), lib.File, Pkgdef)
	}

	/*
	 * load all the object files from the archive now.
	 * this gives us sequential file access and keeps us
	 * from needing to come back later to pick up more
	 * objects.  it breaks the usual C archive model, but
	 * this is Go, not C.  the common case in Go is that
	 * we need to load all the objects, and then we throw away
	 * the individual symbols that are unused.
	 *
	 * loading every object will also make it possible to
	 * load foreign objects not referenced by __.GOSYMDEF.
	 */
	for {
		l = nextar(f, off, &arhdr)
		if l == 0 {
			break
		}
		if l < 0 {
			Exitf("%s: malformed archive", lib.File)
		}

		off += l

		pname = fmt.Sprintf("%s(%s)", lib.File, arhdr.name)
		l = atolwhex(arhdr.size)
		ldobj(f, pkg, l, pname, lib.File, ArchiveObj)
	}

out:
	obj.Bterm(f)
}

//.........這裏部分代碼省略.........
		linehist(infile, 0, 0)

		curio.infile = infile
		var err error
		curio.bin, err = obj.Bopenr(infile)
		if err != nil {
			fmt.Printf("open %s: %v\n", infile, err)
			errorexit()
		}

		curio.peekc = 0
		curio.peekc1 = 0
		curio.nlsemi = 0
		curio.eofnl = 0
		curio.last = 0

		// Skip initial BOM if present.
		if obj.Bgetrune(curio.bin) != obj.BOM {
			obj.Bungetrune(curio.bin)
		}

		block = 1
		iota_ = -1000000

		imported_unsafe = 0

		yyparse()
		if nsyntaxerrors != 0 {
			errorexit()
		}

		linehist("<pop>", 0, 0)
		if curio.bin != nil {
			obj.Bterm(curio.bin)
		}
	}

	testdclstack()
	mkpackage(localpkg.Name) // final import not used checks
	lexfini()

	typecheckok = 1
	if Debug['f'] != 0 {
		frame(1)
	}

	// Process top-level declarations in phases.

	// Phase 1: const, type, and names and types of funcs.
	//   This will gather all the information about types
	//   and methods but doesn't depend on any of it.
	defercheckwidth()

	for l := xtop; l != nil; l = l.Next {
		if l.N.Op != ODCL && l.N.Op != OAS {
			typecheck(&l.N, Etop)
		}
	}

	// Phase 2: Variable assignments.
	//   To check interface assignments, depends on phase 1.
	for l := xtop; l != nil; l = l.Next {
		if l.N.Op == ODCL || l.N.Op == OAS {
			typecheck(&l.N, Etop)
		}
	}

//.........這裏部分代碼省略.........
		linehistpush(infile)

		curio.infile = infile
		var err error
		curio.bin, err = obj.Bopenr(infile)
		if err != nil {
			fmt.Printf("open %s: %v\n", infile, err)
			errorexit()
		}

		curio.peekc = 0
		curio.peekc1 = 0
		curio.nlsemi = false
		curio.eofnl = false
		curio.last = 0

		// Skip initial BOM if present.
		if obj.Bgetrune(curio.bin) != BOM {
			obj.Bungetrune(curio.bin)
		}

		block = 1
		iota_ = -1000000

		imported_unsafe = false

		parse_file()
		if nsyntaxerrors != 0 {
			errorexit()
		}

		linehistpop()
		if curio.bin != nil {
			obj.Bterm(curio.bin)
		}
	}

	testdclstack()
	mkpackage(localpkg.Name) // final import not used checks
	lexfini()

	typecheckok = true
	if Debug['f'] != 0 {
		frame(1)
	}

	// Process top-level declarations in phases.

	// Phase 1: const, type, and names and types of funcs.
	//   This will gather all the information about types
	//   and methods but doesn't depend on any of it.
	defercheckwidth()

	for l := xtop; l != nil; l = l.Next {
		if l.N.Op != ODCL && l.N.Op != OAS && l.N.Op != OAS2 {
			typecheck(&l.N, Etop)
		}
	}

	// Phase 2: Variable assignments.
	//   To check interface assignments, depends on phase 1.
	for l := xtop; l != nil; l = l.Next {
		if l.N.Op == ODCL || l.N.Op == OAS || l.N.Op == OAS2 {
			typecheck(&l.N, Etop)
		}
	}

func importfile(f *Val, indent []byte) {
	if importpkg != nil {
		Fatalf("importpkg not nil")
	}

	path_, ok := f.U.(string)
	if !ok {
		Yyerror("import statement not a string")
		return
	}

	if len(path_) == 0 {
		Yyerror("import path is empty")
		return
	}

	if isbadimport(path_) {
		return
	}

	// The package name main is no longer reserved,
	// but we reserve the import path "main" to identify
	// the main package, just as we reserve the import
	// path "math" to identify the standard math package.
	if path_ == "main" {
		Yyerror("cannot import \"main\"")
		errorexit()
	}

	if myimportpath != "" && path_ == myimportpath {
		Yyerror("import %q while compiling that package (import cycle)", path_)
		errorexit()
	}

	if mapped, ok := importMap[path_]; ok {
		path_ = mapped
	}

	if path_ == "unsafe" {
		if safemode != 0 {
			Yyerror("cannot import package unsafe")
			errorexit()
		}

		importpkg = unsafepkg
		imported_unsafe = true
		return
	}

	if islocalname(path_) {
		if path_[0] == '/' {
			Yyerror("import path cannot be absolute path")
			return
		}

		prefix := Ctxt.Pathname
		if localimport != "" {
			prefix = localimport
		}
		path_ = path.Join(prefix, path_)

		if isbadimport(path_) {
			return
		}
	}

	file, found := findpkg(path_)
	if !found {
		Yyerror("can't find import: %q", path_)
		errorexit()
	}

	importpkg = mkpkg(path_)

	if importpkg.Imported {
		return
	}

	importpkg.Imported = true

	imp, err := obj.Bopenr(file)
	if err != nil {
		Yyerror("can't open import: %q: %v", path_, err)
		errorexit()
	}
	defer obj.Bterm(imp)

	if strings.HasSuffix(file, ".a") {
		if !skiptopkgdef(imp) {
			Yyerror("import %s: not a package file", file)
			errorexit()
		}
	}

	// check object header
	p := obj.Brdstr(imp, '\n', 1)

	if p != "empty archive" {
		if !strings.HasPrefix(p, "go object ") {
			Yyerror("import %s: not a go object file", file)
//.........這裏部分代碼省略.........

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{}
		obj.Bwrite(bout, 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 {
		obj.Bflush(bout)
		size := obj.Boffset(bout) - startobj
		if size&1 != 0 {
			obj.Bputc(bout, 0)
		}
		obj.Bseek(bout, startobj-ArhdrSize, 0)
		formathdr(arhdr[:], "__.PKGDEF", size)
		obj.Bwrite(bout, arhdr[:])
		obj.Bflush(bout)

		obj.Bseek(bout, startobj+size+(size&1), 0)
		arhdr = [ArhdrSize]byte{}
		obj.Bwrite(bout, 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")

	var externs *NodeList
	if externdcl != nil {
		externs = externdcl.End
	}

	dumpglobls()
	dumptypestructs()

	// Dump extra globals.
	tmp := externdcl

	if externs != nil {
		externdcl = externs.Next
	}
	dumpglobls()
	externdcl = tmp

	zero := Pkglookup("zerovalue", Runtimepkg)
	ggloblsym(zero, int32(zerosize), obj.DUPOK|obj.RODATA)

	dumpdata()
	obj.Writeobjdirect(Ctxt, bout)

	if writearchive != 0 {
		obj.Bflush(bout)
		size := obj.Boffset(bout) - startobj
		if size&1 != 0 {
			obj.Bputc(bout, 0)
		}
		obj.Bseek(bout, startobj-ArhdrSize, 0)
		name := fmt.Sprintf("_go_.%c", Thearch.Thechar)
		formathdr(arhdr[:], name, size)
		obj.Bwrite(bout, arhdr[:])
	}

	obj.Bterm(bout)
}