cmd/internal/obj: convert fields of LSym from uint8 to bool

No performance regression measurable:

name      old time/op    new time/op    delta
Template     432ms ± 3%     422ms ± 2%  -2.34%   (p=0.010 n=10+9)
GoTypes      1.46s ± 1%     1.46s ± 1%    ~     (p=0.796 n=10+10)
Compiler     7.15s ± 1%     7.14s ± 1%    ~      (p=0.447 n=10+9)

Change-Id: I21b93cb989017b6fec2215de2423d87f25cf538c
Reviewed-on: https://go-review.googlesource.com/21220
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -135,7 +135,7 @@ func gcsymdup(s *Sym) {
 		Fatalf("cannot rosymdup %s with relocations", ls.Name)
 	}
 	ls.Name = fmt.Sprintf("gclocals·%x", md5.Sum(ls.P))
-	ls.Dupok = 1
+	ls.Dupok = true
 }
 
 func emitptrargsmap() {
@@ -442,7 +442,7 @@ func compile(fn *Node) {
 		ptxt.From3.Offset |= obj.REFLECTMETHOD
 	}
 	if fn.Func.Pragma&Systemstack != 0 {
-		ptxt.From.Sym.Cfunc = 1
+		ptxt.From.Sym.Cfunc = true
 	}
 
 	// Clumsy but important.

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

@@ -367,7 +367,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 			}
 
 			if cursym.Text.Mark&LEAF != 0 {
-				cursym.Leaf = 1
+				cursym.Leaf = true
 				if autosize == 0 {
 					break
 				}
@@ -709,7 +709,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	p.From.Type = obj.TYPE_MEM
 	p.From.Reg = REGG
 	p.From.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-	if ctxt.Cursym.Cfunc != 0 {
+	if ctxt.Cursym.Cfunc {
 		p.From.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 	}
 	p.To.Type = obj.TYPE_REG
@@ -822,7 +822,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	call.To.Type = obj.TYPE_BRANCH
 	morestack := "runtime.morestack"
 	switch {
-	case ctxt.Cursym.Cfunc != 0:
+	case ctxt.Cursym.Cfunc:
 		morestack = "runtime.morestackc"
 	case ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0:
 		morestack = "runtime.morestack_noctxt"

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

@@ -57,7 +57,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	p.From.Type = obj.TYPE_MEM
 	p.From.Reg = REGG
 	p.From.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-	if ctxt.Cursym.Cfunc != 0 {
+	if ctxt.Cursym.Cfunc {
 		p.From.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 	}
 	p.To.Type = obj.TYPE_REG
@@ -193,7 +193,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	call.To.Type = obj.TYPE_BRANCH
 	morestack := "runtime.morestack"
 	switch {
-	case ctxt.Cursym.Cfunc != 0:
+	case ctxt.Cursym.Cfunc:
 		morestack = "runtime.morestackc"
 	case ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0:
 		morestack = "runtime.morestack_noctxt"
@@ -718,7 +718,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 				aoffset = 0xF0
 			}
 			if cursym.Text.Mark&LEAF != 0 {
-				cursym.Leaf = 1
+				cursym.Leaf = true
 				if ctxt.Autosize == 0 {
 					break
 				}

src/cmd/internal/obj/link.go

@@ -309,12 +309,12 @@ type LSym struct {
 	Name      string
 	Type      int16
 	Version   int16
-	Dupok     uint8
+	Dupok     bool
-	Cfunc     uint8
+	Cfunc     bool
-	Nosplit   uint8
+	Nosplit   bool
-	Leaf      uint8
+	Leaf      bool
-	Seenglobl uint8
+	Seenglobl bool
-	Onlist    uint8
+	Onlist    bool
 
 	// ReflectMethod means the function may call reflect.Type.Method or
 	// reflect.Type.MethodByName. Matching is imprecise (as reflect.Type

src/cmd/internal/obj/mips/obj0.go

@@ -302,7 +302,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 			}
 
 			if cursym.Text.Mark&LEAF != 0 {
-				cursym.Leaf = 1
+				cursym.Leaf = true
 				break
 			}
 
@@ -560,7 +560,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	p.From.Type = obj.TYPE_MEM
 	p.From.Reg = REGG
 	p.From.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-	if ctxt.Cursym.Cfunc != 0 {
+	if ctxt.Cursym.Cfunc {
 		p.From.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 	}
 	p.To.Type = obj.TYPE_REG
@@ -690,7 +690,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 
 	p.As = AJAL
 	p.To.Type = obj.TYPE_BRANCH
-	if ctxt.Cursym.Cfunc != 0 {
+	if ctxt.Cursym.Cfunc {
 		p.To.Sym = obj.Linklookup(ctxt, "runtime.morestackc", 0)
 	} else if ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0 {
 		p.To.Sym = obj.Linklookup(ctxt, "runtime.morestack_noctxt", 0)

src/cmd/internal/obj/objfile.go

@@ -170,15 +170,14 @@ func flushplist(ctxt *Link, freeProgs bool) {
 
 			case AGLOBL:
 				s := p.From.Sym
-				tmp6 := s.Seenglobl
+				if s.Seenglobl {
-				s.Seenglobl++
-				if tmp6 != 0 {
 					fmt.Printf("duplicate %v\n", p)
 				}
-				if s.Onlist != 0 {
+				s.Seenglobl = true
+				if s.Onlist {
 					log.Fatalf("symbol %s listed multiple times", s.Name)
 				}
-				s.Onlist = 1
+				s.Onlist = true
 				ctxt.Data = append(ctxt.Data, s)
 				s.Size = p.To.Offset
 				if s.Type == 0 || s.Type == SXREF {
@@ -186,7 +185,7 @@ func flushplist(ctxt *Link, freeProgs bool) {
 				}
 				flag := int(p.From3.Offset)
 				if flag&DUPOK != 0 {
-					s.Dupok = 1
+					s.Dupok = true
 				}
 				if flag&RODATA != 0 {
 					s.Type = SRODATA
@@ -209,17 +208,17 @@ func flushplist(ctxt *Link, freeProgs bool) {
 				if s.Text != nil {
 					log.Fatalf("duplicate TEXT for %s", s.Name)
 				}
-				if s.Onlist != 0 {
+				if s.Onlist {
 					log.Fatalf("symbol %s listed multiple times", s.Name)
 				}
-				s.Onlist = 1
+				s.Onlist = true
 				text = append(text, s)
 				flag := int(p.From3Offset())
 				if flag&DUPOK != 0 {
-					s.Dupok = 1
+					s.Dupok = true
 				}
 				if flag&NOSPLIT != 0 {
-					s.Nosplit = 1
+					s.Nosplit = true
 				}
 				if flag&REFLECTMETHOD != 0 {
 					s.ReflectMethod = true
@@ -437,19 +436,19 @@ func writesym(ctxt *Link, b *Biobuf, s *LSym) {
 		if s.Type != 0 {
 			fmt.Fprintf(ctxt.Bso, "t=%d ", s.Type)
 		}
-		if s.Dupok != 0 {
+		if s.Dupok {
 			fmt.Fprintf(ctxt.Bso, "dupok ")
 		}
-		if s.Cfunc != 0 {
+		if s.Cfunc {
 			fmt.Fprintf(ctxt.Bso, "cfunc ")
 		}
-		if s.Nosplit != 0 {
+		if s.Nosplit {
 			fmt.Fprintf(ctxt.Bso, "nosplit ")
 		}
 		fmt.Fprintf(ctxt.Bso, "size=%d", s.Size)
 		if s.Type == STEXT {
 			fmt.Fprintf(ctxt.Bso, " args=%#x locals=%#x", uint64(s.Args), uint64(s.Locals))
-			if s.Leaf != 0 {
+			if s.Leaf {
 				fmt.Fprintf(ctxt.Bso, " leaf")
 			}
 		}
@@ -499,9 +498,12 @@ func writesym(ctxt *Link, b *Biobuf, s *LSym) {
 	Bputc(b, 0xfe)
 	wrint(b, int64(s.Type))
 	wrsym(b, s)
-	flags := int64(s.Dupok)
+	flags := int64(0)
+	if s.Dupok {
+		flags |= 1
+	}
 	if s.Local {
-		flags |= 2
+		flags |= 1 << 1
 	}
 	wrint(b, flags)
 	wrint(b, s.Size)
@@ -522,8 +524,18 @@ func writesym(ctxt *Link, b *Biobuf, s *LSym) {
 	if s.Type == STEXT {
 		wrint(b, int64(s.Args))
 		wrint(b, int64(s.Locals))
-		wrint(b, int64(s.Nosplit))
+		if s.Nosplit {
-		flags := int64(s.Leaf) | int64(s.Cfunc)<<1
+			wrint(b, 1)
+		} else {
+			wrint(b, 0)
+		}
+		flags := int64(0)
+		if s.Leaf {
+			flags |= 1
+		}
+		if s.Cfunc {
+			flags |= 1 << 1
+		}
 		if s.ReflectMethod {
 			flags |= 1 << 2
 		}

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

@@ -534,7 +534,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 			}
 
 			if cursym.Text.Mark&LEAF != 0 {
-				cursym.Leaf = 1
+				cursym.Leaf = true
 				break
 			}
 
@@ -828,7 +828,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	p.From.Type = obj.TYPE_MEM
 	p.From.Reg = REGG
 	p.From.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-	if ctxt.Cursym.Cfunc != 0 {
+	if ctxt.Cursym.Cfunc {
 		p.From.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 	}
 	p.To.Type = obj.TYPE_REG
@@ -943,7 +943,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	}
 
 	var morestacksym *obj.LSym
-	if ctxt.Cursym.Cfunc != 0 {
+	if ctxt.Cursym.Cfunc {
 		morestacksym = obj.Linklookup(ctxt, "runtime.morestackc", 0)
 	} else if ctxt.Cursym.Text.From3.Offset&obj.NEEDCTXT == 0 {
 		morestacksym = obj.Linklookup(ctxt, "runtime.morestack_noctxt", 0)

src/cmd/internal/obj/x86/obj6.go

@@ -985,7 +985,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32, textarg int32) *ob
 		p.From.Reg = REG_SP
 		indir_cx(ctxt, p, &p.To)
 		p.To.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-		if ctxt.Cursym.Cfunc != 0 {
+		if ctxt.Cursym.Cfunc {
 			p.To.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 		}
 	} else if framesize <= obj.StackBig {
@@ -1007,7 +1007,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32, textarg int32) *ob
 		p.From.Reg = REG_AX
 		indir_cx(ctxt, p, &p.To)
 		p.To.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-		if ctxt.Cursym.Cfunc != 0 {
+		if ctxt.Cursym.Cfunc {
 			p.To.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 		}
 	} else {
@@ -1031,7 +1031,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32, textarg int32) *ob
 		p.As = mov
 		indir_cx(ctxt, p, &p.From)
 		p.From.Offset = 2 * int64(ctxt.Arch.Ptrsize) // G.stackguard0
-		if ctxt.Cursym.Cfunc != 0 {
+		if ctxt.Cursym.Cfunc {
 			p.From.Offset = 3 * int64(ctxt.Arch.Ptrsize) // G.stackguard1
 		}
 		p.To.Type = obj.TYPE_REG
@@ -1095,7 +1095,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32, textarg int32) *ob
 	call.To.Type = obj.TYPE_BRANCH
 	morestack := "runtime.morestack"
 	switch {
-	case ctxt.Cursym.Cfunc != 0:
+	case ctxt.Cursym.Cfunc:
 		morestack = "runtime.morestackc"
 	case ctxt.Cursym.Text.From3Offset()&obj.NEEDCTXT == 0:
 		morestack = "runtime.morestack_noctxt"