cmd/internal/obj: clean up Biobuf

This is a follow up to rev 443a32e707 which reduces some of the
duplication between methods and functions that operate on obj.Biobuf.

obj.Biobuf has Flush and Write methods as well as helpers which duplicate
those methods, consolidate on the former and remove the latter.

Also, address a final comment from CL 9525.

Change-Id: I67deaf3a163bb489a9bb21bb39524785d7a2f6c5
Reviewed-on: https://go-review.googlesource.com/9527
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/8g/galign.go

@@ -61,7 +61,7 @@ func main() {
 		gc.Thearch.FREGMAX = x86.REG_X7
 	default:
 		fmt.Fprintf(os.Stderr, "unsupported setting GO386=%s\n", v)
-		os.Exit(1)
+		gc.Exit(1)
 	}
 	gc.Thearch.MAXWIDTH = MAXWIDTH
 	gc.Thearch.ReservedRegs = resvd

src/cmd/asm/internal/asm/endtoend_test.go

@@ -33,7 +33,7 @@ func testEndToEnd(t *testing.T, goarch string) {
 	var ok bool
 	testOut = new(bytes.Buffer) // The assembler writes -S output to this buffer.
 	ctxt.Bso = obj.Binitw(os.Stdout)
-	defer obj.Bflush(ctxt.Bso)
+	defer ctxt.Bso.Flush()
 	ctxt.Diag = log.Fatalf
 	obj.Binitw(ioutil.Discard)
 	pList.Firstpc, ok = parser.Parse()

src/cmd/asm/main.go

@@ -46,7 +46,7 @@ func main() {
 		ctxt.Flag_shared = 1
 	}
 	ctxt.Bso = obj.Binitw(os.Stdout)
-	defer obj.Bflush(ctxt.Bso)
+	defer ctxt.Bso.Flush()
 	ctxt.Diag = log.Fatalf
 	output := obj.Binitw(fd)
 	fmt.Fprintf(output, "go object %s %s %s\n", obj.Getgoos(), obj.Getgoarch(), obj.Getgoversion())
@@ -63,5 +63,5 @@ func main() {
 		os.Exit(1)
 	}
 	obj.Writeobjdirect(ctxt, output)
-	obj.Bflush(output)
+	output.Flush()
 }

src/cmd/internal/asm/asm.go

@@ -209,7 +209,7 @@ func Main() {
 	if assemble(flag.Arg(0)) != 0 {
 		errorexit()
 	}
-	obj.Bflush(&bstdout)
+	bstdout.Flush()
 	if nerrors > 0 {
 		errorexit()
 	}
@@ -244,7 +244,7 @@ func assemble(file string) int {
 	}
 
 	obj.Writeobjdirect(Ctxt, &obuf)
-	obj.Bflush(&obuf)
+	obuf.Flush()
 	return 0
 }
 

src/cmd/internal/asm/lexbody.go

@@ -98,7 +98,7 @@ func setinclude(p string) {
 }
 
 func errorexit() {
-	obj.Bflush(&bstdout)
+	bstdout.Flush()
 	if outfile != "" {
 		os.Remove(outfile)
 	}

src/cmd/internal/gc/obj.go

@@ -35,7 +35,7 @@ func dumpobj() {
 	if writearchive != 0 {
 		obj.Bwritestring(bout, "!<arch>\n")
 		arhdr = [ArhdrSize]byte{}
-		obj.Bwrite(bout, arhdr[:])
+		bout.Write(arhdr[:])
 		startobj = obj.Boffset(bout)
 	}
 
@@ -43,19 +43,19 @@ func dumpobj() {
 	dumpexport()
 
 	if writearchive != 0 {
-		obj.Bflush(bout)
+		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)
-		obj.Bwrite(bout, arhdr[:])
-		obj.Bflush(bout)
+		bout.Write(arhdr[:])
+		bout.Flush()
 
 		obj.Bseek(bout, startobj+size+(size&1), 0)
 		arhdr = [ArhdrSize]byte{}
-		obj.Bwrite(bout, arhdr[:])
+		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())
 	}
@@ -96,7 +96,7 @@ func dumpobj() {
 	obj.Writeobjdirect(Ctxt, bout)
 
 	if writearchive != 0 {
-		obj.Bflush(bout)
+		bout.Flush()
 		size := obj.Boffset(bout) - startobj
 		if size&1 != 0 {
 			obj.Bputc(bout, 0)
@@ -104,7 +104,7 @@ func dumpobj() {
 		obj.Bseek(bout, startobj-ArhdrSize, 0)
 		name := fmt.Sprintf("_go_.%c", Thearch.Thechar)
 		formathdr(arhdr[:], name, size)
-		obj.Bwrite(bout, arhdr[:])
+		bout.Write(arhdr[:])
 	}
 
 	obj.Bterm(bout)

src/cmd/internal/gc/subr.go

@@ -82,7 +82,7 @@ func (x errcmp) Less(i, j int) bool {
 }
 
 func Flusherrors() {
-	obj.Bflush(&bstdout)
+	bstdout.Flush()
 	if len(errors) == 0 {
 		return
 	}

src/cmd/internal/obj/arm/obj5.go

@@ -338,7 +338,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 			if autosize == 0 && cursym.Text.Mark&LEAF == 0 {
 				if ctxt.Debugvlog != 0 {
 					fmt.Fprintf(ctxt.Bso, "save suppressed in: %s\n", cursym.Name)
-					obj.Bflush(ctxt.Bso)
+					ctxt.Bso.Flush()
 				}
 
 				cursym.Text.Mark |= LEAF

src/cmd/internal/obj/arm64/obj7.go

@@ -485,7 +485,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 	 * strip NOPs
 	 * expand RET
 	 */
-	obj.Bflush(ctxt.Bso)
+	ctxt.Bso.Flush()
 	q := (*obj.Prog)(nil)
 	var q1 *obj.Prog
 	for p := cursym.Text; p != nil; p = p.Link {
@@ -575,7 +575,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 				if ctxt.Debugvlog != 0 {
 					fmt.Fprintf(ctxt.Bso, "save suppressed in: %s\n", cursym.Text.From.Sym.Name)
 				}
-				obj.Bflush(ctxt.Bso)
+				ctxt.Bso.Flush()
 				cursym.Text.Mark |= LEAF
 			}
 

src/cmd/internal/obj/objfile.go

@@ -481,7 +481,7 @@ func wrint(b *Biobuf, sval int64) {
 	}
 	p[0] = uint8(v)
 	p = p[1:]
-	Bwrite(b, varintbuf[:len(varintbuf)-len(p)])
+	b.Write(varintbuf[:len(varintbuf)-len(p)])
 }
 
 func wrstring(b *Biobuf, s string) {
@@ -497,7 +497,7 @@ func wrpath(ctxt *Link, b *Biobuf, p string) {
 
 func wrdata(b *Biobuf, v []byte) {
 	wrint(b, int64(len(v)))
-	Bwrite(b, v)
+	b.Write(v)
 }
 
 func wrpathsym(ctxt *Link, b *Biobuf, s *LSym) {

src/cmd/internal/obj/ppc64/obj9.go

@@ -137,7 +137,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 	if ctxt.Debugvlog != 0 {
 		fmt.Fprintf(ctxt.Bso, "%5.2f noops\n", obj.Cputime())
 	}
-	obj.Bflush(ctxt.Bso)
+	ctxt.Bso.Flush()
 
 	var q *obj.Prog
 	var q1 *obj.Prog
@@ -346,7 +346,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 			} else if cursym.Text.Mark&LEAF == 0 {
 				if ctxt.Debugvlog != 0 {
 					fmt.Fprintf(ctxt.Bso, "save suppressed in: %s\n", cursym.Name)
-					obj.Bflush(ctxt.Bso)
+					ctxt.Bso.Flush()
 				}
 
 				cursym.Text.Mark |= LEAF

src/cmd/internal/obj/util.go

@@ -99,10 +99,6 @@ func (b *Biobuf) Flush() error {
 	return b.w.Flush()
 }
 
-func Bwrite(b *Biobuf, p []byte) (int, error) {
-	return b.w.Write(p)
-}
-
 func Bputc(b *Biobuf, c byte) {
 	b.w.WriteByte(c)
 }
@@ -189,10 +185,6 @@ func Bungetc(b *Biobuf) {
 	b.numUnget++
 }
 
-func Bflush(b *Biobuf) error {
-	return b.w.Flush()
-}
-
 func Bterm(b *Biobuf) error {
 	var err error
 	if b.w != nil {