cmd/internal/obj: replace AGLOBL with (*Link).Globl

Replace the AGLOBL pseudo-op with a method to directly register an
LSym as a global. Similar to how we previously already replaced the
ADATA pseudo-op with directly writing out data bytes.

Passes toolstash -cmp.

Change-Id: I3631af0a2ab5798152d0c26b833dc309dbec5772
Reviewed-on: https://go-review.googlesource.com/29366
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -269,17 +269,7 @@ func (p *Parser) asmGlobl(word string, operands [][]lex.Token) {
 	}
 
 	// log.Printf("GLOBL %s %d, $%d", name, flag, size)
-	prog := &obj.Prog{
-		Ctxt:   p.ctxt,
-		As:     obj.AGLOBL,
-		Lineno: p.histLineNum,
-		From:   nameAddr,
-		From3: &obj.Addr{
-			Offset: flag,
-		},
-		To: addr,
-	}
-	p.append(prog, "", false)
+	p.ctxt.Globl(nameAddr.Sym, addr.Offset, int(flag))
 }
 
 // asmPCData assembles a PCDATA pseudo-op.

src/cmd/compile/internal/gc/dcl.go

@@ -1268,7 +1268,6 @@ func funccompile(n *Node) {
 		// If we have compile errors, ignore any assembler/linker errors.
 		Ctxt.DiagFunc = func(string, ...interface{}) {}
 	}
-	flushdata()
 	obj.Flushplist(Ctxt) // convert from Prog list to machine code
 }
 

src/cmd/compile/internal/gc/gsubr.go

@@ -35,33 +35,13 @@ import (
 	"fmt"
 )
 
-var (
-	ddumped bool
-	dfirst  *obj.Prog
-	dpc     *obj.Prog
-)
-
 func Prog(as obj.As) *obj.Prog {
 	var p *obj.Prog
 
-	if as == obj.AGLOBL {
-		if ddumped {
-			Fatalf("already dumped data")
-		}
-		if dpc == nil {
-			dpc = Ctxt.NewProg()
-			dfirst = dpc
-		}
-
-		p = dpc
-		dpc = Ctxt.NewProg()
-		p.Link = dpc
-	} else {
-		p = Pc
-		Pc = Ctxt.NewProg()
-		Clearp(Pc)
-		p.Link = Pc
-	}
+	p = Pc
+	Pc = Ctxt.NewProg()
+	Clearp(Pc)
+	p.Link = Pc
 
 	if lineno == 0 && Debug['K'] != 0 {
 		Warn("prog: line 0")
@@ -102,29 +82,6 @@ func Appendpp(p *obj.Prog, as obj.As, ftype obj.AddrType, freg int16, foffset in
 	return q
 }
 
-func dumpdata() {
-	ddumped = true
-	if dfirst == nil {
-		return
-	}
-	newplist()
-	*Pc = *dfirst
-	Pc = dpc
-	Clearp(Pc)
-}
-
-func flushdata() {
-	if dfirst == nil {
-		return
-	}
-	newplist()
-	*Pc = *dfirst
-	Pc = dpc
-	Clearp(Pc)
-	dfirst = nil
-	dpc = nil
-}
-
 // Fixup instructions after allocauto (formerly compactframe) has moved all autos around.
 func fixautoused(p *obj.Prog) {
 	for lp := &p; ; {
@@ -160,19 +117,16 @@ func fixautoused(p *obj.Prog) {
 }
 
 func ggloblnod(nam *Node) {
-	p := Gins(obj.AGLOBL, nam, nil)
-	p.Lineno = nam.Lineno
-	p.From.Sym.Gotype = Linksym(ngotype(nam))
-	p.To.Sym = nil
-	p.To.Type = obj.TYPE_CONST
-	p.To.Offset = nam.Type.Width
-	p.From3 = new(obj.Addr)
+	s := Linksym(nam.Sym)
+	s.Gotype = Linksym(ngotype(nam))
+	flags := 0
 	if nam.Name.Readonly {
-		p.From3.Offset = obj.RODATA
+		flags = obj.RODATA
 	}
 	if nam.Type != nil && !haspointers(nam.Type) {
-		p.From3.Offset |= obj.NOPTR
+		flags |= obj.NOPTR
 	}
+	Ctxt.Globl(s, nam.Type.Width, flags)
 }
 
 func ggloblsym(s *Sym, width int32, flags int16) {
@@ -180,18 +134,11 @@ func ggloblsym(s *Sym, width int32, flags int16) {
 }
 
 func ggloblLSym(s *obj.LSym, width int32, flags int16) {
-	p := Gins(obj.AGLOBL, nil, nil)
-	p.From.Type = obj.TYPE_MEM
-	p.From.Name = obj.NAME_EXTERN
-	p.From.Sym = s
 	if flags&obj.LOCAL != 0 {
-		p.From.Sym.Local = true
+		s.Local = true
 		flags &^= obj.LOCAL
 	}
-	p.To.Type = obj.TYPE_CONST
-	p.To.Offset = int64(width)
-	p.From3 = new(obj.Addr)
-	p.From3.Offset = int64(flags)
+	Ctxt.Globl(s, int64(width), int(flags))
 }
 
 func gtrack(s *Sym) {
@@ -450,7 +397,7 @@ func Patch(p *obj.Prog, to *obj.Prog) {
 func Gins(as obj.As, f, t *Node) *obj.Prog {
 	switch as {
 	case obj.AVARKILL, obj.AVARLIVE, obj.AVARDEF, obj.ATYPE,
-		obj.ATEXT, obj.AFUNCDATA, obj.AUSEFIELD, obj.AGLOBL:
+		obj.ATEXT, obj.AFUNCDATA, obj.AUSEFIELD:
 	default:
 		Fatalf("unhandled gins op %v", as)
 	}

src/cmd/compile/internal/gc/obj.go

@@ -147,7 +147,6 @@ func dumpobj1(outfile string, mode int) {
 		ggloblsym(zero, int32(zerosize), obj.DUPOK|obj.RODATA)
 	}
 
-	dumpdata()
 	obj.Writeobjdirect(Ctxt, bout.Writer)
 
 	if writearchive {

src/cmd/compile/internal/gc/plive.go

@@ -855,7 +855,7 @@ func checkptxt(fn *Node, firstp *obj.Prog) {
 		if false {
 			fmt.Printf("analyzing '%v'\n", p)
 		}
-		if p.As != obj.AGLOBL && p.As != obj.ATYPE {
+		if p.As != obj.ATYPE {
 			checkprog(fn, p)
 		}
 	}

src/cmd/internal/obj/link.go

@@ -276,7 +276,6 @@ const (
 	ADUFFZERO
 	AEND
 	AFUNCDATA
-	AGLOBL
 	AJMP
 	ANOP
 	APCDATA

src/cmd/internal/obj/plist.go

@@ -82,34 +82,6 @@ func flushplist(ctxt *Link, freeProgs bool) {
 				curtext.Autom = a
 				continue
 
-			case AGLOBL:
-				s := p.From.Sym
-				if s.Seenglobl {
-					fmt.Printf("duplicate %v\n", p)
-				}
-				s.Seenglobl = true
-				if s.Onlist {
-					log.Fatalf("symbol %s listed multiple times", s.Name)
-				}
-				s.Onlist = true
-				ctxt.Data = append(ctxt.Data, s)
-				s.Size = p.To.Offset
-				if s.Type == 0 || s.Type == SXREF {
-					s.Type = SBSS
-				}
-				flag := int(p.From3.Offset)
-				if flag&DUPOK != 0 {
-					s.Dupok = true
-				}
-				if flag&RODATA != 0 {
-					s.Type = SRODATA
-				} else if flag&NOPTR != 0 {
-					s.Type = SNOPTRBSS
-				} else if flag&TLSBSS != 0 {
-					s.Type = STLSBSS
-				}
-				continue
-
 			case ATEXT:
 				s := p.From.Sym
 				if s == nil {
@@ -217,3 +189,29 @@ func flushplist(ctxt *Link, freeProgs bool) {
 		ctxt.freeProgs()
 	}
 }
+
+func (ctxt *Link) Globl(s *LSym, size int64, flag int) {
+	if s.Seenglobl {
+		fmt.Printf("duplicate %v\n", s)
+	}
+	s.Seenglobl = true
+	if s.Onlist {
+		log.Fatalf("symbol %s listed multiple times", s.Name)
+	}
+	s.Onlist = true
+	ctxt.Data = append(ctxt.Data, s)
+	s.Size = size
+	if s.Type == 0 || s.Type == SXREF {
+		s.Type = SBSS
+	}
+	if flag&DUPOK != 0 {
+		s.Dupok = true
+	}
+	if flag&RODATA != 0 {
+		s.Type = SRODATA
+	} else if flag&NOPTR != 0 {
+		s.Type = SNOPTRBSS
+	} else if flag&TLSBSS != 0 {
+		s.Type = STLSBSS
+	}
+}

src/cmd/internal/obj/util.go

@@ -143,7 +143,7 @@ func (p *Prog) String() string {
 		sep = ", "
 	}
 	if p.From3Type() != TYPE_NONE {
-		if p.From3.Type == TYPE_CONST && (p.As == ATEXT || p.As == AGLOBL) {
+		if p.From3.Type == TYPE_CONST && p.As == ATEXT {
 			// Special case - omit $.
 			fmt.Fprintf(&buf, "%s%d", sep, p.From3.Offset)
 		} else if quadOpAmd64 {
@@ -477,7 +477,6 @@ var Anames = []string{
 	"DUFFZERO",
 	"END",
 	"FUNCDATA",
-	"GLOBL",
 	"JMP",
 	"NOP",
 	"PCDATA",

src/cmd/internal/obj/x86/asm6.go

@@ -1148,7 +1148,6 @@ var optab =
 	{AFXSAVE, ysvrs, Pm, [23]uint8{0xae, 00, 0xae, 00}},
 	{AFXRSTOR64, ysvrs, Pw, [23]uint8{0x0f, 0xae, 01, 0x0f, 0xae, 01}},
 	{AFXSAVE64, ysvrs, Pw, [23]uint8{0x0f, 0xae, 00, 0x0f, 0xae, 00}},
-	{obj.AGLOBL, nil, 0, [23]uint8{}},
 	{AHLT, ynone, Px, [23]uint8{0xf4}},
 	{AIDIVB, ydivb, Pb, [23]uint8{0xf6, 07}},
 	{AIDIVL, ydivl, Px, [23]uint8{0xf7, 07}},