cmd/internal/obj: manual C->Go cleanups

Change-Id: I5964fc55157dc1df7be400dfa0df591d6163e25e
Reviewed-on: https://go-review.googlesource.com/9084Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>

src/cmd/internal/obj/libc.go

+// Copyright 2015 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.
+
 package obj
 
 const (
 	AEXIST = 0
+	BOM    = 0xFEFF
 )
 
 var GOEXPERIMENT string
-
-const (
-	OREAD = iota
-	OWRITE
-	ORDWR
-	SIGBUS
-	SIGSEGV
-	NDFLT
-	FPPDBL
-	FPRNR
-	HEADER_IO
-	BOM = 0xFEFF
-)

src/cmd/internal/obj/link.go

@@ -481,7 +481,7 @@ type Link struct {
 
 type SymVer struct {
 	Name    string
-	Version int
+	Version int // TODO: make int16 to match LSym.Version?
 }
 
 // LinkArch is the definition of a single architecture.
@@ -527,13 +527,11 @@ type Plist struct {
  */
 func Linknewplist(ctxt *Link) *Plist {
 	pl := new(Plist)
-	*pl = Plist{}
 	if ctxt.Plist == nil {
 		ctxt.Plist = pl
 	} else {
 		ctxt.Plast.Link = pl
 	}
 	ctxt.Plast = pl
-
 	return pl
 }

src/cmd/internal/obj/objfile.go

@@ -514,7 +514,3 @@ func wrsym(b *Biobuf, s *LSym) {
 	wrstring(b, s.Name)
 	wrint(b, int64(s.Version))
 }
-
-var startmagic string = "\x00\x00go13ld"
-
-var endmagic string = "\xff\xffgo13ld"

src/cmd/internal/obj/stack.go

+// Copyright 2011 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.
+
 // Inferno utils/5l/span.c
 // http://code.google.com/p/inferno-os/source/browse/utils/5l/span.c
 //
@@ -30,12 +34,6 @@
 
 package obj
 
-// Instruction layout.
-
-// Copyright 2011 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.
-
 // For the linkers. Must match Go definitions.
 // TODO(rsc): Share Go definitions with linkers directly.
 

src/cmd/internal/obj/sym.go

@@ -32,17 +32,13 @@
 package obj
 
 import (
-	"fmt"
 	"log"
 	"os"
 	"path/filepath"
 	"runtime"
+	"strconv"
 )
 
-func yy_isalpha(c int) bool {
-	return 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z'
-}
-
 var headers = []struct {
 	name string
 	val  int
@@ -71,16 +67,13 @@ func headtype(name string) int {
 	return -1
 }
 
-var headstr_buf string
-
 func Headstr(v int) string {
 	for i := 0; i < len(headers); i++ {
 		if v == headers[i].val {
 			return headers[i].name
 		}
 	}
-	headstr_buf = fmt.Sprintf("%d", v)
-	return headstr_buf
+	return strconv.Itoa(v)
 }
 
 func Linknew(arch *LinkArch) *Link {
@@ -185,38 +178,31 @@ func Linknew(arch *LinkArch) *Link {
 	return ctxt
 }
 
-func linknewsym(ctxt *Link, symb string, v int) *LSym {
-	s := new(LSym)
-	*s = LSym{}
-
-	s.Name = symb
-	s.Type = 0
-	s.Version = int16(v)
-	s.Value = 0
-	s.Size = 0
-
-	return s
-}
-
-func _lookup(ctxt *Link, symb string, v int, creat int) *LSym {
+func _lookup(ctxt *Link, symb string, v int, create bool) *LSym {
 	s := ctxt.Hash[SymVer{symb, v}]
-	if s != nil || creat == 0 {
+	if s != nil || !create {
 		return s
 	}
 
-	s = linknewsym(ctxt, symb, v)
+	s = &LSym{
+		Name:    symb,
+		Type:    0,
+		Version: int16(v),
+		Value:   0,
+		Size:    0,
+	}
 	ctxt.Hash[SymVer{symb, v}] = s
 
 	return s
 }
 
 func Linklookup(ctxt *Link, name string, v int) *LSym {
-	return _lookup(ctxt, name, v, 1)
+	return _lookup(ctxt, name, v, true)
 }
 
 // read-only lookup
 func linkrlookup(ctxt *Link, name string, v int) *LSym {
-	return _lookup(ctxt, name, v, 0)
+	return _lookup(ctxt, name, v, false)
 }
 
 func Linksymfmt(s *LSym) string {

src/cmd/internal/obj/typekind.go

-// Copyright 2009 The Go Authors. All rights reserved.
+// Copyright 2012 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.
 
 package obj
 
-// Copyright 2012 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.
-
 // Must match runtime and reflect.
 // Included by cmd/gc.