cmd/internal/ld: replace Diag;Errorexit with Exitf

I have left the Diag calls in place where I believe Ctxt.Cursym != nil
which means this CL is not the improvement I had hoped for. However
it is now safe to call Exitf whereever you are in the linker, which
makes it easier to reason about some code.

Change-Id: I8261e761ca9719f7d216e2747314adfe464e3337
Reviewed-on: https://go-review.googlesource.com/8668Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/5l/asm.go

@@ -93,9 +93,7 @@ func adddynrel(s *ld.LSym, r *ld.Reloc) {
 		return
 
 	case 256 + ld.R_ARM_THM_PC22: // R_ARM_THM_CALL
-		ld.Diag("R_ARM_THM_CALL, are you using -marm?")
-
-		ld.Errorexit()
+		ld.Exitf("R_ARM_THM_CALL, are you using -marm?")
 		return
 
 	case 256 + ld.R_ARM_GOT32: // R_ARM_GOT_BREL

src/cmd/5l/obj.go

@@ -105,9 +105,7 @@ func archinit() {
 
 	switch ld.HEADTYPE {
 	default:
-		ld.Diag("unknown -H option")
-		ld.Errorexit()
-		fallthrough
+		ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
 
 	case ld.Hplan9: /* plan 9 */
 		ld.HEADR = 32

src/cmd/6l/obj.go

@@ -118,9 +118,7 @@ func archinit() {
 
 	switch ld.HEADTYPE {
 	default:
-		ld.Diag("unknown -H option")
-		ld.Errorexit()
-		fallthrough
+		ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
 
 	case ld.Hplan9: /* plan 9 */
 		ld.HEADR = 32 + 8

src/cmd/7l/obj.go

@@ -107,9 +107,7 @@ func archinit() {
 
 	switch ld.HEADTYPE {
 	default:
-		ld.Diag("unknown -H option")
-		ld.Errorexit()
-		fallthrough
+		ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
 
 	case ld.Hplan9: /* plan 9 */
 		ld.HEADR = 32

src/cmd/8l/obj.go

@@ -107,9 +107,7 @@ func archinit() {
 
 	switch ld.HEADTYPE {
 	default:
-		ld.Diag("unknown -H option")
-		ld.Errorexit()
-		fallthrough
+		ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
 
 	case ld.Hplan9: /* plan 9 */
 		ld.HEADR = 32

src/cmd/9l/obj.go

@@ -111,9 +111,7 @@ func archinit() {
 
 	switch ld.HEADTYPE {
 	default:
-		ld.Diag("unknown -H option")
-		ld.Errorexit()
-		fallthrough
+		ld.Exitf("unknown -H option: %v", ld.HEADTYPE)
 
 	case ld.Hplan9: /* plan 9 */
 		ld.HEADR = 32

src/cmd/internal/ld/data.go

@@ -482,7 +482,7 @@ func relocsym(s *LSym) {
 			// 64-bit architectures so as to be future-proof.
 			if int32(o) < 0 && Thearch.Ptrsize > 4 && siz == 4 {
 				Diag("non-pc-relative relocation address is too big: %#x (%#x + %#x)", uint64(o), Symaddr(r.Sym), r.Add)
-				Errorexit()
+				errorexit()
 			}
 
 			// r->sym can be null when CALL $(constant) is transformed from absolute PC to relative PC call.
@@ -713,7 +713,7 @@ func blk(start *LSym, addr int64, size int64) {
 		Ctxt.Cursym = sym
 		if sym.Value < addr {
 			Diag("phase error: addr=%#x but sym=%#x type=%d", int64(addr), int64(sym.Value), sym.Type)
-			Errorexit()
+			errorexit()
 		}
 
 		for ; addr < sym.Value; addr++ {
@@ -731,7 +731,7 @@ func blk(start *LSym, addr int64, size int64) {
 		}
 		if addr != sym.Value+sym.Size {
 			Diag("phase error: addr=%#x value+size=%#x", int64(addr), int64(sym.Value)+sym.Size)
-			Errorexit()
+			errorexit()
 		}
 
 		if sym.Value+sym.Size >= eaddr {

src/cmd/internal/ld/decodesym.go

@@ -35,10 +35,10 @@ func decode_inuxi(p []byte, sz int) uint64 {
 		return uint64(Ctxt.Arch.ByteOrder.Uint32(p))
 	case 8:
 		return Ctxt.Arch.ByteOrder.Uint64(p)
+	default:
+		Exitf("dwarf: decode inuxi %d", sz)
+		panic("unreachable")
 	}
-	Diag("dwarf: decode inuxi %d", sz)
-	Errorexit()
-	return 0
 }
 
 func commonsize() int {

src/cmd/internal/ld/dwarf.go

@@ -674,13 +674,11 @@ notfound:
 	return nil
 }
 
-func find_or_diag(die *DWDie, name string) *DWDie {
+func mustFind(die *DWDie, name string) *DWDie {
 	r := find(die, name)
 	if r == nil {
-		Diag("dwarf find: %s %p has no %s", getattr(die, DW_AT_name).data, die, name)
-		Errorexit()
+		Exitf("dwarf find: %s %p has no %s", getattr(die, DW_AT_name).data, die, name)
 	}
-
 	return r
 }
 
@@ -843,9 +841,7 @@ func putattr(abbrev int, form int, cls int, value int64, data interface{}) {
 		DW_FORM_indirect: // (see Section 7.5.3)
 		fallthrough
 	default:
-		Diag("dwarf: unsupported attribute form %d / class %d", form, cls)
-
-		Errorexit()
+		Exitf("dwarf: unsupported attribute form %d / class %d", form, cls)
 	}
 }
 
@@ -924,8 +920,7 @@ func newabslocexprattr(die *DWDie, addr int64, sym *LSym) {
 func lookup_or_diag(n string) *LSym {
 	s := Linkrlookup(Ctxt, n, 0)
 	if s == nil || s.Size == 0 {
-		Diag("dwarf: missing type: %s", n)
-		Errorexit()
+		Exitf("dwarf: missing type: %s", n)
 	}
 
 	return s
@@ -961,12 +956,12 @@ func dotypedef(parent *DWDie, name string, def *DWDie) {
 // Define gotype, for composite ones recurse into constituents.
 func defgotype(gotype *LSym) *DWDie {
 	if gotype == nil {
-		return find_or_diag(&dwtypes, "<unspecified>")
+		return mustFind(&dwtypes, "<unspecified>")
 	}
 
 	if !strings.HasPrefix(gotype.Name, "type.") {
 		Diag("dwarf: type name doesn't start with \".type\": %s", gotype.Name)
-		return find_or_diag(&dwtypes, "<unspecified>")
+		return mustFind(&dwtypes, "<unspecified>")
 	}
 
 	name := gotype.Name[5:] // could also decode from Type.string
@@ -1032,7 +1027,7 @@ func defgotype(gotype *LSym) *DWDie {
 		// use actual length not upper bound; correct for 0-length arrays.
 		newattr(fld, DW_AT_count, DW_CLS_CONSTANT, decodetype_arraylen(gotype), 0)
 
-		newrefattr(fld, DW_AT_type, find_or_diag(&dwtypes, "uintptr"))
+		newrefattr(fld, DW_AT_type, mustFind(&dwtypes, "uintptr"))
 
 	case obj.KindChan:
 		die = newdie(&dwtypes, DW_ABRV_CHANTYPE, name)
@@ -1043,7 +1038,7 @@ func defgotype(gotype *LSym) *DWDie {
 	case obj.KindFunc:
 		die = newdie(&dwtypes, DW_ABRV_FUNCTYPE, name)
 		dotypedef(&dwtypes, name, die)
-		newrefattr(die, DW_AT_type, find_or_diag(&dwtypes, "void"))
+		newrefattr(die, DW_AT_type, mustFind(&dwtypes, "void"))
 		nfields := decodetype_funcincount(gotype)
 		var fld *DWDie
 		var s *LSym
@@ -1125,7 +1120,7 @@ func defgotype(gotype *LSym) *DWDie {
 	default:
 		Diag("dwarf: definition of unknown kind %d: %s", kind, gotype.Name)
 		die = newdie(&dwtypes, DW_ABRV_TYPEDECL, name)
-		newrefattr(die, DW_AT_type, find_or_diag(&dwtypes, "<unspecified>"))
+		newrefattr(die, DW_AT_type, mustFind(&dwtypes, "<unspecified>"))
 	}
 
 	newattr(die, DW_AT_go_kind, DW_CLS_CONSTANT, int64(kind), 0)
@@ -1173,7 +1168,7 @@ func copychildren(dst *DWDie, src *DWDie) {
 // Search children (assumed to have DW_TAG_member) for the one named
 // field and set its DW_AT_type to dwtype
 func substitutetype(structdie *DWDie, field string, dwtype *DWDie) {
-	child := find_or_diag(structdie, field)
+	child := mustFind(structdie, field)
 	if child == nil {
 		return
 	}
@@ -1302,7 +1297,7 @@ func synthesizemaptypes(die *DWDie) {
 		newrefattr(dwhk, DW_AT_type, t)
 		fld = newdie(dwhk, DW_ABRV_ARRAYRANGE, "size")
 		newattr(fld, DW_AT_count, DW_CLS_CONSTANT, BucketSize, 0)
-		newrefattr(fld, DW_AT_type, find_or_diag(&dwtypes, "uintptr"))
+		newrefattr(fld, DW_AT_type, mustFind(&dwtypes, "uintptr"))
 
 		// Construct type to represent an array of BucketSize values
 		dwhv = newdie(&dwtypes, DW_ABRV_ARRAYTYPE, mkinternaltypename("[]val", getattr(valtype, DW_AT_name).data.(string), ""))
@@ -1315,7 +1310,7 @@ func synthesizemaptypes(die *DWDie) {
 		newrefattr(dwhv, DW_AT_type, t)
 		fld = newdie(dwhv, DW_ABRV_ARRAYRANGE, "size")
 		newattr(fld, DW_AT_count, DW_CLS_CONSTANT, BucketSize, 0)
-		newrefattr(fld, DW_AT_type, find_or_diag(&dwtypes, "uintptr"))
+		newrefattr(fld, DW_AT_type, mustFind(&dwtypes, "uintptr"))
 
 		// Construct bucket<K,V>
 		dwhb = newdie(&dwtypes, DW_ABRV_STRUCTTYPE, mkinternaltypename("bucket", getattr(keytype, DW_AT_name).data.(string), getattr(valtype, DW_AT_name).data.(string)))
@@ -1335,7 +1330,7 @@ func synthesizemaptypes(die *DWDie) {
 		newmemberoffsetattr(fld, BucketSize+BucketSize*(int32(keysize)+int32(valsize)))
 		if Thearch.Regsize > Thearch.Ptrsize {
 			fld = newdie(dwhb, DW_ABRV_STRUCTFIELD, "pad")
-			newrefattr(fld, DW_AT_type, find_or_diag(&dwtypes, "uintptr"))
+			newrefattr(fld, DW_AT_type, mustFind(&dwtypes, "uintptr"))
 			newmemberoffsetattr(fld, BucketSize+BucketSize*(int32(keysize)+int32(valsize))+int32(Thearch.Ptrsize))
 		}
 
@@ -1804,8 +1799,7 @@ func writeframes() {
 	pad := CIERESERVE + frameo + 4 - Cpos()
 
 	if pad < 0 {
-		Diag("dwarf: CIERESERVE too small by %d bytes.", -pad)
-		Errorexit()
+		Exitf("dwarf: CIERESERVE too small by %d bytes.", -pad)
 	}
 
 	strnput("", int(pad))
@@ -2150,13 +2144,11 @@ func Dwarfemitdebugsections() {
 		Cseek(infoo)
 		writeinfo()
 		if fwdcount > 0 {
-			Diag("dwarf: unresolved references after first dwarf info pass")
-			Errorexit()
+			Exitf("dwarf: unresolved references after first dwarf info pass")
 		}
 
 		if infoe != Cpos() {
-			Diag("dwarf: inconsistent second dwarf info pass")
-			Errorexit()
+			Exitf("dwarf: inconsistent second dwarf info pass")
 		}
 	}
 

src/cmd/internal/ld/elf.go

@@ -7,7 +7,6 @@ package ld
 import (
 	"encoding/binary"
 	"fmt"
-	"os"
 )
 
 /*
@@ -870,7 +869,7 @@ func elfwriteshdrs() uint32 {
 func elfsetstring(s string, off int) {
 	if nelfstr >= len(elfstr) {
 		Diag("too many elf strings")
-		Errorexit()
+		errorexit()
 	}
 
 	elfstr[nelfstr].s = s
@@ -1133,8 +1132,7 @@ func addbuildinfo(val string) {
 	var j int
 
 	if val[0] != '0' || val[1] != 'x' {
-		fmt.Fprintf(os.Stderr, "%s: -B argument must start with 0x: %s\n", os.Args[0], val)
-		Exit(2)
+		Exitf("-B argument must start with 0x: %s", val)
 	}
 
 	ov := val
@@ -1143,8 +1141,7 @@ func addbuildinfo(val string) {
 	var b int
 	for val != "" {
 		if len(val) == 1 {
-			fmt.Fprintf(os.Stderr, "%s: -B argument must have even number of digits: %s\n", os.Args[0], ov)
-			Exit(2)
+			Exitf("-B argument must have even number of digits: %s", ov)
 		}
 
 		b = 0
@@ -1157,15 +1154,13 @@ func addbuildinfo(val string) {
 			} else if val[0] >= 'A' && val[0] <= 'F' {
 				b += int(val[0]) - 'A' + 10
 			} else {
-				fmt.Fprintf(os.Stderr, "%s: -B argument contains invalid hex digit %c: %s\n", os.Args[0], val[0], ov)
-				Exit(2)
+				Exitf("-B argument contains invalid hex digit %c: %s", val[0], ov)
 			}
 		}
 
 		const maxLen = 32
 		if i >= maxLen {
-			fmt.Fprintf(os.Stderr, "%s: -B option too long (max %d digits): %s\n", os.Args[0], maxLen, ov)
-			Exit(2)
+			Exitf("-B option too long (max %d digits): %s", maxLen, ov)
 		}
 
 		buildinfo = append(buildinfo, uint8(b))
@@ -1264,21 +1259,7 @@ func elfdynhash() {
 	need := make([]*Elfaux, nsym)
 	chain := make([]uint32, nsym)
 	buckets := make([]uint32, nbucket)
-	if need == nil || chain == nil || buckets == nil {
-		Ctxt.Cursym = nil
-		Diag("out of memory")
-		Errorexit()
-	}
 
-	for i := 0; i < nsym; i++ {
-		need[i] = nil
-	}
-	for i := 0; i < nsym; i++ {
-		chain[i] = 0
-	}
-	for i := 0; i < nbucket; i++ {
-		buckets[i] = 0
-	}
 	var b int
 	var hc uint32
 	var name string
@@ -1434,7 +1415,7 @@ func elfshname(name string) *ElfShdr {
 	}
 
 	Diag("cannot find elf name %s", name)
-	Errorexit()
+	errorexit()
 	return nil
 }
 
@@ -1884,22 +1865,15 @@ func Asmbelf(symo int64) {
 	eh := getElfEhdr()
 	switch Thearch.Thechar {
 	default:
-		Diag("unknown architecture in asmbelf")
-		Errorexit()
-		fallthrough
-
+		Exitf("unknown architecture in asmbelf: %v", Thearch.Thechar)
 	case '5':
 		eh.machine = EM_ARM
-
 	case '6':
 		eh.machine = EM_X86_64
-
 	case '7':
 		eh.machine = EM_AARCH64
-
 	case '8':
 		eh.machine = EM_386
-
 	case '9':
 		eh.machine = EM_PPC64
 	}

src/cmd/internal/ld/go.go

@@ -67,7 +67,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 	if int64(int(length)) != length {
 		fmt.Fprintf(os.Stderr, "%s: too much pkg data in %s\n", os.Args[0], filename)
 		if Debug['u'] != 0 {
-			Errorexit()
+			errorexit()
 		}
 		return
 	}
@@ -76,7 +76,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 	if int64(Bread(f, bdata)) != length {
 		fmt.Fprintf(os.Stderr, "%s: short pkg read %s\n", os.Args[0], filename)
 		if Debug['u'] != 0 {
-			Errorexit()
+			errorexit()
 		}
 		return
 	}
@@ -86,8 +86,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 	p0 = strings.Index(data, "\n$$")
 	if p0 < 0 {
 		if Debug['u'] != 0 && whence != ArchiveObj {
-			fmt.Fprintf(os.Stderr, "%s: cannot find export data in %s\n", os.Args[0], filename)
-			Errorexit()
+			Exitf("cannot find export data in %s", filename)
 		}
 		return
 	}
@@ -102,7 +101,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 	if p1 < 0 {
 		fmt.Fprintf(os.Stderr, "%s: cannot find end of exports in %s\n", os.Args[0], filename)
 		if Debug['u'] != 0 {
-			Errorexit()
+			errorexit()
 		}
 		return
 	}
@@ -115,7 +114,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 		if !strings.HasPrefix(data[p0:], "package ") {
 			fmt.Fprintf(os.Stderr, "%s: bad package section in %s - %.20s\n", os.Args[0], filename, data[p0:])
 			if Debug['u'] != 0 {
-				Errorexit()
+				errorexit()
 			}
 			return
 		}
@@ -129,9 +128,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 			p0++
 		}
 		if Debug['u'] != 0 && whence != ArchiveObj && (p0+6 > p1 || !strings.HasPrefix(data[p0:], " safe\n")) {
-			fmt.Fprintf(os.Stderr, "%s: load of unsafe package %s\n", os.Args[0], filename)
-			nerrors++
-			Errorexit()
+			Exitf("load of unsafe package %s", filename)
 		}
 
 		name := data[pname:p0]
@@ -143,9 +140,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 		}
 
 		if pkg == "main" && name != "main" {
-			fmt.Fprintf(os.Stderr, "%s: %s: not package main (package %s)\n", os.Args[0], filename, name)
-			nerrors++
-			Errorexit()
+			Exitf("%s: not package main (package %s)", filename, name)
 		}
 
 		loadpkgdata(filename, pkg, data[p0:p1])
@@ -164,7 +159,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 		if i < 0 {
 			fmt.Fprintf(os.Stderr, "%s: found $$ // cgo but no newline in %s\n", os.Args[0], filename)
 			if Debug['u'] != 0 {
-				Errorexit()
+				errorexit()
 			}
 			return
 		}
@@ -177,7 +172,7 @@ func ldpkg(f *Biobuf, pkg string, length int64, filename string, whence int) {
 		if p1 < 0 {
 			fmt.Fprintf(os.Stderr, "%s: cannot find end of // cgo section in %s\n", os.Args[0], filename)
 			if Debug['u'] != 0 {
-				Errorexit()
+				errorexit()
 			}
 			return
 		}
@@ -832,7 +827,6 @@ func setlinkmode(arg string) {
 	} else if arg == "auto" {
 		Linkmode = LinkAuto
 	} else {
-		fmt.Fprintf(os.Stderr, "unknown link mode -linkmode %s\n", arg)
-		Errorexit()
+		Exitf("unknown link mode -linkmode %s", arg)
 	}
 }

src/cmd/internal/ld/ldelf.go

@@ -597,11 +597,6 @@ func ldelf(f *Biobuf, pkg string, length int64, pn string) {
 	// symbol 0 is the null symbol.
 	symbols = make([]*LSym, elfobj.nsymtab)
 
-	if symbols == nil {
-		Diag("out of memory")
-		Errorexit()
-	}
-
 	for i := 1; i < elfobj.nsymtab; i++ {
 		if err = readelfsym(elfobj, i, &sym, 1); err != nil {
 			goto bad
@@ -643,8 +638,7 @@ func ldelf(f *Biobuf, pkg string, length int64, pn string) {
 			if s.Dupok != 0 {
 				continue
 			}
-			Diag("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
-			Errorexit()
+			Exitf("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
 		}
 
 		s.Sub = sect.sym.Sub

src/cmd/internal/ld/ldmacho.go

@@ -641,8 +641,7 @@ func ldmacho(f *Biobuf, pkg string, length int64, pn string) {
 			if s.Dupok != 0 {
 				continue
 			}
-			Diag("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
-			Errorexit()
+			Exitf("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
 		}
 
 		s.Type = outer.Type | SSUB

src/cmd/internal/ld/ldpe.go

@@ -399,8 +399,7 @@ func ldpe(f *Biobuf, pkg string, length int64, pn string) {
 			if s.Dupok != 0 {
 				continue
 			}
-			Diag("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
-			Errorexit()
+			Exitf("%s: duplicate symbol reference: %s in both %s and %s", pn, s.Name, s.Outer.Name, sect.sym.Name)
 		}
 
 		s.Sub = sect.sym.Sub

src/cmd/internal/ld/lib.go

@@ -356,8 +356,7 @@ func libinit() {
 	mayberemoveoutfile()
 	f, err := os.OpenFile(outfile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0775)
 	if err != nil {
-		Diag("cannot create %s: %v", outfile, err)
-		Errorexit()
+		Exitf("cannot create %s: %v", outfile, err)
 	}
 
 	cout = f
@@ -381,7 +380,16 @@ func libinit() {
 	}
 }
 
-func Errorexit() {
+func Exitf(format string, a ...interface{}) {
+	fmt.Fprintf(os.Stderr, os.Args[0]+": "+format+"\n", a...)
+	if cout != nil {
+		cout.Close()
+		mayberemoveoutfile()
+	}
+	Exit(2)
+}
+
+func errorexit() {
 	if cout != nil {
 		// For rmtemp run at atexit time on Windows.
 		cout.Close()
@@ -621,8 +629,7 @@ func objfile(file string, pkg string) {
 	var f *Biobuf
 	f, err = Bopenr(file)
 	if err != nil {
-		Diag("cannot open file %s: %v", file, err)
-		Errorexit()
+		Exitf("cannot open file %s: %v", file, err)
 	}
 
 	magbuf := make([]byte, len(ARMAG))
@@ -686,9 +693,7 @@ func objfile(file string, pkg string) {
 			break
 		}
 		if l < 0 {
-			Diag("%s: malformed archive", file)
-			Errorexit()
-			goto out
+			Exitf("%s: malformed archive", file)
 		}
 
 		off += l
@@ -767,9 +772,7 @@ func hostobjs() {
 		var err error
 		f, err = Bopenr(h.file)
 		if f == nil {
-			Ctxt.Cursym = nil
-			Diag("cannot reopen %s: %v", h.pn, err)
-			Errorexit()
+			Exitf("cannot reopen %s: %v", h.pn, err)
 		}
 
 		Bseek(f, h.off, 0)
@@ -806,8 +809,7 @@ func hostlinksetup() {
 	var err error
 	cout, err = os.OpenFile(p, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0775)
 	if err != nil {
-		Diag("cannot create %s: %v", p, err)
-		Errorexit()
+		Exitf("cannot create %s: %v", p, err)
 	}
 
 	coutbuf = *Binitw(cout)
@@ -819,33 +821,23 @@ func hostobjCopy() (paths []string) {
 	for i, h := range hostobj {
 		f, err := os.Open(h.file)
 		if err != nil {
-			Ctxt.Cursym = nil
-			Diag("cannot reopen %s: %v", h.pn, err)
-			Errorexit()
+			Exitf("cannot reopen %s: %v", h.pn, err)
 		}
 		if _, err := f.Seek(h.off, 0); err != nil {
-			Ctxt.Cursym = nil
-			Diag("cannot seek %s: %v", h.pn, err)
-			Errorexit()
+			Exitf("cannot seek %s: %v", h.pn, err)
 		}
 
 		p := fmt.Sprintf("%s/%06d.o", tmpdir, i)
 		paths = append(paths, p)
 		w, err := os.Create(p)
 		if err != nil {
-			Ctxt.Cursym = nil
-			Diag("cannot create %s: %v", p, err)
-			Errorexit()
+			Exitf("cannot create %s: %v", p, err)
 		}
 		if _, err := io.CopyN(w, f, h.length); err != nil {
-			Ctxt.Cursym = nil
-			Diag("cannot write %s: %v", p, err)
-			Errorexit()
+			Exitf("cannot write %s: %v", p, err)
 		}
 		if err := w.Close(); err != nil {
-			Ctxt.Cursym = nil
-			Diag("cannot close %s: %v", p, err)
-			Errorexit()
+			Exitf("cannot close %s: %v", p, err)
 		}
 	}
 	return paths
@@ -868,9 +860,7 @@ func archive() {
 	}
 
 	if out, err := exec.Command(argv[0], argv[1:]...).CombinedOutput(); err != nil {
-		Ctxt.Cursym = nil
-		Diag("%s: running %s failed: %v\n%s", os.Args[0], argv[0], err, out)
-		Errorexit()
+		Exitf("running %s failed: %v\n%s", argv[0], err, out)
 	}
 }
 
@@ -1014,9 +1004,7 @@ func hostlink() {
 	}
 
 	if out, err := exec.Command(argv[0], argv[1:]...).CombinedOutput(); err != nil {
-		Ctxt.Cursym = nil
-		Diag("%s: running %s failed: %v\n%s", os.Args[0], argv[0], err, out)
-		Errorexit()
+		Exitf("running %s failed: %v\n%s", argv[0], err, out)
 	}
 }
 
@@ -1050,39 +1038,32 @@ func ldobj(f *Biobuf, pkg string, length int64, pn string, file string, whence i
 
 	/* check the header */
 	line := Brdline(f, '\n')
-
-	var import0 int64
-	var import1 int64
-	var t string
 	if line == "" {
 		if Blinelen(f) > 0 {
 			Diag("%s: not an object file", pn)
 			return
 		}
-
-		goto eof
+		Diag("truncated object file: %s", pn)
+		return
 	}
 
 	if !strings.HasPrefix(line, "go object ") {
 		if strings.HasSuffix(pn, ".go") {
-			fmt.Printf("%cl: input %s is not .%c file (use %cg to compile .go files)\n", Thearch.Thechar, pn, Thearch.Thechar, Thearch.Thechar)
-			Errorexit()
+			Exitf("%cl: input %s is not .%c file (use %cg to compile .go files)", Thearch.Thechar, pn, Thearch.Thechar, Thearch.Thechar)
 		}
 
 		if line == Thestring {
 			// old header format: just $GOOS
 			Diag("%s: stale object file", pn)
-
 			return
 		}
 
 		Diag("%s: not an object file", pn)
-
 		return
 	}
 
 	// First, check that the basic goos, goarch, and version match.
-	t = fmt.Sprintf("%s %s %s ", goos, obj.Getgoarch(), obj.Getgoversion())
+	t := fmt.Sprintf("%s %s %s ", goos, obj.Getgoarch(), obj.Getgoversion())
 
 	line = strings.TrimRight(line, "\n")
 	if !strings.HasPrefix(line[10:]+" ", t) && Debug['f'] == 0 {
@@ -1103,7 +1084,7 @@ func ldobj(f *Biobuf, pkg string, length int64, pn string, file string, whence i
 	}
 
 	/* skip over exports and other info -- ends with \n!\n */
-	import0 = Boffset(f)
+	import0 := Boffset(f)
 
 	c1 = '\n' // the last line ended in \n
 	c2 = Bgetc(f)
@@ -1113,22 +1094,18 @@ func ldobj(f *Biobuf, pkg string, length int64, pn string, file string, whence i
 		c2 = c3
 		c3 = Bgetc(f)
 		if c3 == Beof {
-			goto eof
+			Diag("truncated object file: %s", pn)
+			return
 		}
 	}
 
-	import1 = Boffset(f)
+	import1 := Boffset(f)
 
 	Bseek(f, import0, 0)
 	ldpkg(f, pkg, import1-import0-2, pn, whence) // -2 for !\n
 	Bseek(f, import1, 0)
 
 	ldobjfile(Ctxt, f, pkg, eof-Boffset(f), pn)
-
-	return
-
-eof:
-	Diag("truncated object file: %s", pn)
 }
 
 func ldshlibsyms(shlib string) {
@@ -1553,8 +1530,7 @@ func usage() {
 func setheadtype(s string) {
 	h := headtype(s)
 	if h < 0 {
-		fmt.Fprintf(os.Stderr, "unknown header type -H %s\n", s)
-		Errorexit()
+		Exitf("unknown header type -H %s", s)
 	}
 
 	headstring = s
@@ -1567,8 +1543,7 @@ func setinterp(s string) {
 }
 
 func doversion() {
-	fmt.Printf("%cl version %s\n", Thearch.Thechar, obj.Getgoversion())
-	Errorexit()
+	Exitf("version %s", obj.Getgoversion())
 }
 
 func genasmsym(put func(*LSym, string, int, int64, int64, int, *LSym)) {
@@ -1756,7 +1731,7 @@ func undef() {
 		undefsym(s)
 	}
 	if nerrors > 0 {
-		Errorexit()
+		errorexit()
 	}
 }
 
@@ -1791,8 +1766,7 @@ func Diag(format string, args ...interface{}) {
 
 	nerrors++
 	if nerrors > 20 {
-		fmt.Printf("too many errors\n")
-		Errorexit()
+		Exitf("too many errors")
 	}
 }
 

src/cmd/internal/ld/macho.go

@@ -159,8 +159,7 @@ func newMachoLoad(type_ uint32, ndata uint32) *MachoLoad {
 
 func newMachoSeg(name string, msect int) *MachoSeg {
 	if nseg >= len(seg) {
-		Diag("too many segs")
-		Errorexit()
+		Exitf("too many segs")
 	}
 
 	s := &seg[nseg]
@@ -173,8 +172,7 @@ func newMachoSeg(name string, msect int) *MachoSeg {
 
 func newMachoSect(seg *MachoSeg, name string, segname string) *MachoSect {
 	if seg.nsect >= seg.msect {
-		Diag("too many sects in segment %s", seg.name)
-		Errorexit()
+		Exitf("too many sects in segment %s", seg.name)
 	}
 
 	s := &seg.sect[seg.nsect]
@@ -419,9 +417,7 @@ func Asmbmacho() {
 	mh := getMachoHdr()
 	switch Thearch.Thechar {
 	default:
-		Diag("unknown mach architecture")
-		Errorexit()
-		fallthrough
+		Exitf("unknown macho architecture: %v", Thearch.Thechar)
 
 	case '5':
 		mh.cpu = MACHO_CPU_ARM
@@ -491,9 +487,7 @@ func Asmbmacho() {
 	if Linkmode != LinkExternal {
 		switch Thearch.Thechar {
 		default:
-			Diag("unknown macho architecture")
-			Errorexit()
-			fallthrough
+			Exitf("unknown macho architecture: %v", Thearch.Thechar)
 
 		case '5':
 			ml := newMachoLoad(5, 17+2)          /* unix thread */
@@ -572,7 +566,7 @@ func Asmbmacho() {
 
 	a := machowrite()
 	if int32(a) > HEADR {
-		Diag("HEADR too small: %d > %d", a, HEADR)
+		Exitf("HEADR too small: %d > %d", a, HEADR)
 	}
 }
 

src/cmd/internal/ld/pcln.go

@@ -298,7 +298,7 @@ func pclntab() {
 				for pciterinit(Ctxt, &it, &pcln.Pcfile); it.done == 0; pciternext(&it) {
 					if it.value < 1 || it.value > Ctxt.Nhistfile {
 						Diag("bad file number in pcfile: %d not in range [1, %d]\n", it.value, Ctxt.Nhistfile)
-						Errorexit()
+						errorexit()
 					}
 				}
 			}
@@ -337,7 +337,7 @@ func pclntab() {
 
 		if off != end {
 			Diag("bad math in functab: funcstart=%d off=%d but end=%d (npcdata=%d nfuncdata=%d ptrsize=%d)", funcstart, off, end, pcln.Npcdata, pcln.Nfuncdata, Thearch.Ptrsize)
-			Errorexit()
+			errorexit()
 		}
 
 		nfunc++

src/cmd/internal/ld/pe.go

@@ -389,7 +389,7 @@ var ncoffsym int
 func addpesection(name string, sectsize int, filesize int) *IMAGE_SECTION_HEADER {
 	if pensect == 16 {
 		Diag("too many sections")
-		Errorexit()
+		errorexit()
 	}
 
 	h := &sh[pensect]
@@ -410,19 +410,19 @@ func addpesection(name string, sectsize int, filesize int) *IMAGE_SECTION_HEADER
 func chksectoff(h *IMAGE_SECTION_HEADER, off int64) {
 	if off != int64(h.PointerToRawData) {
 		Diag("%s.PointerToRawData = %#x, want %#x", cstring(h.Name[:]), uint64(int64(h.PointerToRawData)), uint64(off))
-		Errorexit()
+		errorexit()
 	}
 }
 
 func chksectseg(h *IMAGE_SECTION_HEADER, s *Segment) {
 	if s.Vaddr-PEBASE != uint64(h.VirtualAddress) {
 		Diag("%s.VirtualAddress = %#x, want %#x", cstring(h.Name[:]), uint64(int64(h.VirtualAddress)), uint64(int64(s.Vaddr-PEBASE)))
-		Errorexit()
+		errorexit()
 	}
 
 	if s.Fileoff != uint64(h.PointerToRawData) {
 		Diag("%s.PointerToRawData = %#x, want %#x", cstring(h.Name[:]), uint64(int64(h.PointerToRawData)), uint64(int64(s.Fileoff)))
-		Errorexit()
+		errorexit()
 	}
 }
 
@@ -711,7 +711,7 @@ func initdynexport() {
 		}
 		if nexport+1 > len(dexport) {
 			Diag("pe dynexport table is full")
-			Errorexit()
+			errorexit()
 		}
 
 		dexport[nexport] = s
@@ -1096,13 +1096,9 @@ func addpersrc() {
 func Asmbpe() {
 	switch Thearch.Thechar {
 	default:
-		Diag("unknown PE architecture")
-		Errorexit()
-		fallthrough
-
+		Exitf("unknown PE architecture: %v", Thearch.Thechar)
 	case '6':
 		fh.Machine = IMAGE_FILE_MACHINE_AMD64
-
 	case '8':
 		fh.Machine = IMAGE_FILE_MACHINE_I386
 	}

src/cmd/internal/ld/pobj.go

@@ -148,8 +148,7 @@ func Ldmain() {
 		if Buildmode == BuildmodeExe {
 			Buildmode = BuildmodeCShared
 		} else if Buildmode != BuildmodeCShared {
-			Diag("-shared and -buildmode=%s are incompatible\n", Buildmode.String())
-			Errorexit()
+			Exitf("-shared and -buildmode=%s are incompatible", Buildmode.String())
 		}
 	}
 
@@ -178,8 +177,7 @@ func Ldmain() {
 	Thearch.Archinit()
 
 	if Linkshared && !Iself {
-		Diag("-linkshared can only be used on elf systems")
-		Errorexit()
+		Exitf("-linkshared can only be used on elf systems")
 	}
 
 	if Debug['v'] != 0 {
@@ -246,5 +244,5 @@ func Ldmain() {
 
 	Bflush(&Bso)
 
-	Errorexit()
+	errorexit()
 }