cmd/compile: make Haspointers a method instead of a function

More ergonomic that way. Also change Haspointers to HasPointers
while we are here.

Change-Id: I45bedc294c1a8c2bd01dc14bd04615ae77555375
Reviewed-on: https://go-review.googlesource.com/c/go/+/249959
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

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

@@ -384,7 +384,7 @@ func (e *Escape) paramTag(fn *Node, narg int, f *types.Field) string {
 			return unsafeUintptrTag
 		}
 
-		if !types.Haspointers(f.Type) { // don't bother tagging for scalars
+		if !f.Type.HasPointers() { // don't bother tagging for scalars
 			return ""
 		}
 
@@ -422,7 +422,7 @@ func (e *Escape) paramTag(fn *Node, narg int, f *types.Field) string {
 		}
 	}
 
-	if !types.Haspointers(f.Type) { // don't bother tagging for scalars
+	if !f.Type.HasPointers() { // don't bother tagging for scalars
 		return ""
 	}
 

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

@@ -326,7 +326,7 @@ func (e *Escape) stmt(n *Node) {
 			if typesw && n.Left.Left != nil {
 				cv := cas.Rlist.First()
 				k := e.dcl(cv) // type switch variables have no ODCL.
-				if types.Haspointers(cv.Type) {
+				if cv.Type.HasPointers() {
 					ks = append(ks, k.dotType(cv.Type, cas, "switch case"))
 				}
 			}
@@ -433,7 +433,7 @@ func (e *Escape) exprSkipInit(k EscHole, n *Node) {
 
 	if uintptrEscapesHack && n.Op == OCONVNOP && n.Left.Type.IsUnsafePtr() {
 		// nop
-	} else if k.derefs >= 0 && !types.Haspointers(n.Type) {
+	} else if k.derefs >= 0 && !n.Type.HasPointers() {
 		k = e.discardHole()
 	}
 
@@ -698,7 +698,7 @@ func (e *Escape) addr(n *Node) EscHole {
 		e.assignHeap(n.Right, "key of map put", n)
 	}
 
-	if !types.Haspointers(n.Type) {
+	if !n.Type.HasPointers() {
 		k = e.discardHole()
 	}
 
@@ -811,14 +811,14 @@ func (e *Escape) call(ks []EscHole, call, where *Node) {
 		// slice might be allocated, and all slice elements
 		// might flow to heap.
 		appendeeK := ks[0]
-		if types.Haspointers(args[0].Type.Elem()) {
+		if args[0].Type.Elem().HasPointers() {
 			appendeeK = e.teeHole(appendeeK, e.heapHole().deref(call, "appendee slice"))
 		}
 		argument(appendeeK, args[0])
 
 		if call.IsDDD() {
 			appendedK := e.discardHole()
-			if args[1].Type.IsSlice() && types.Haspointers(args[1].Type.Elem()) {
+			if args[1].Type.IsSlice() && args[1].Type.Elem().HasPointers() {
 				appendedK = e.heapHole().deref(call, "appended slice...")
 			}
 			argument(appendedK, args[1])
@@ -832,7 +832,7 @@ func (e *Escape) call(ks []EscHole, call, where *Node) {
 		argument(e.discardHole(), call.Left)
 
 		copiedK := e.discardHole()
-		if call.Right.Type.IsSlice() && types.Haspointers(call.Right.Type.Elem()) {
+		if call.Right.Type.IsSlice() && call.Right.Type.Elem().HasPointers() {
 			copiedK = e.heapHole().deref(call, "copied slice")
 		}
 		argument(copiedK, call.Right)

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

@@ -32,7 +32,6 @@ package gc
 
 import (
 	"cmd/compile/internal/ssa"
-	"cmd/compile/internal/types"
 	"cmd/internal/obj"
 	"cmd/internal/objabi"
 	"cmd/internal/src"
@@ -316,7 +315,7 @@ func ggloblnod(nam *Node) {
 	if nam.Name.Readonly() {
 		flags = obj.RODATA
 	}
-	if nam.Type != nil && !types.Haspointers(nam.Type) {
+	if nam.Type != nil && !nam.Type.HasPointers() {
 		flags |= obj.NOPTR
 	}
 	Ctxt.Globl(s, nam.Type.Width, flags)

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

@@ -927,7 +927,7 @@ func (o *Order) stmt(n *Node) {
 						n2.Ninit.Append(tmp2)
 					}
 
-					r.Left = o.newTemp(r.Right.Left.Type.Elem(), types.Haspointers(r.Right.Left.Type.Elem()))
+					r.Left = o.newTemp(r.Right.Left.Type.Elem(), r.Right.Left.Type.Elem().HasPointers())
 					tmp2 := nod(OAS, tmp1, r.Left)
 					tmp2 = typecheck(tmp2, ctxStmt)
 					n2.Ninit.Append(tmp2)
@@ -1406,7 +1406,7 @@ func (o *Order) as2(n *Node) {
 	left := []*Node{}
 	for ni, l := range n.List.Slice() {
 		if !l.isBlank() {
-			tmp := o.newTemp(l.Type, types.Haspointers(l.Type))
+			tmp := o.newTemp(l.Type, l.Type.HasPointers())
 			n.List.SetIndex(ni, tmp)
 			tmplist = append(tmplist, tmp)
 			left = append(left, l)
@@ -1428,7 +1428,7 @@ func (o *Order) okAs2(n *Node) {
 	var tmp1, tmp2 *Node
 	if !n.List.First().isBlank() {
 		typ := n.Right.Type
-		tmp1 = o.newTemp(typ, types.Haspointers(typ))
+		tmp1 = o.newTemp(typ, typ.HasPointers())
 	}
 
 	if !n.List.Second().isBlank() {

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

@@ -80,8 +80,8 @@ func cmpstackvarlt(a, b *Node) bool {
 		return a.Name.Used()
 	}
 
-	ap := types.Haspointers(a.Type)
+	ap := a.Type.HasPointers()
-	bp := types.Haspointers(b.Type)
+	bp := b.Type.HasPointers()
 	if ap != bp {
 		return ap
 	}
@@ -176,7 +176,7 @@ func (s *ssafn) AllocFrame(f *ssa.Func) {
 		}
 		s.stksize += w
 		s.stksize = Rnd(s.stksize, int64(n.Type.Align))
-		if types.Haspointers(n.Type) {
+		if n.Type.HasPointers() {
 			s.stkptrsize = s.stksize
 			lastHasPtr = true
 		} else {

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

@@ -185,8 +185,8 @@ func TestStackvarSort(t *testing.T) {
 	// exercise this function on all inputs so that reflect.DeepEqual
 	// doesn't produce false positives.
 	for i := range want {
-		types.Haspointers(want[i].Type)
+		want[i].Type.HasPointers()
-		types.Haspointers(inp[i].Type)
+		inp[i].Type.HasPointers()
 	}
 
 	sort.Sort(byStackVar(inp))

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

@@ -259,7 +259,7 @@ func (v *varRegVec) AndNot(v1, v2 varRegVec) {
 // nor do we care about empty structs (handled by the pointer check),
 // nor do we care about the fake PAUTOHEAP variables.
 func livenessShouldTrack(n *Node) bool {
-	return n.Op == ONAME && (n.Class() == PAUTO || n.Class() == PPARAM || n.Class() == PPARAMOUT) && types.Haspointers(n.Type)
+	return n.Op == ONAME && (n.Class() == PAUTO || n.Class() == PPARAM || n.Class() == PPARAMOUT) && n.Type.HasPointers()
 }
 
 // getvariables returns the list of on-stack variables that we need to track

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

@@ -334,7 +334,7 @@ func walkrange(n *Node) *Node {
 
 		hv1 := temp(t.Elem())
 		hv1.SetTypecheck(1)
-		if types.Haspointers(t.Elem()) {
+		if t.Elem().HasPointers() {
 			init = append(init, nod(OAS, hv1, nil))
 		}
 		hb := temp(types.Types[TBOOL])

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

@@ -119,7 +119,7 @@ func bmap(t *types.Type) *types.Type {
 	// the type of the overflow field to uintptr in this case.
 	// See comment on hmap.overflow in runtime/map.go.
 	otyp := types.NewPtr(bucket)
-	if !types.Haspointers(elemtype) && !types.Haspointers(keytype) {
+	if !elemtype.HasPointers() && !keytype.HasPointers() {
 		otyp = types.Types[TUINTPTR]
 	}
 	overflow := makefield("overflow", otyp)
@@ -754,7 +754,7 @@ var kinds = []int{
 // typeptrdata returns the length in bytes of the prefix of t
 // containing pointer data. Anything after this offset is scalar data.
 func typeptrdata(t *types.Type) int64 {
-	if !types.Haspointers(t) {
+	if !t.HasPointers() {
 		return 0
 	}
 
@@ -788,7 +788,7 @@ func typeptrdata(t *types.Type) int64 {
 		// Find the last field that has pointers.
 		var lastPtrField *types.Field
 		for _, t1 := range t.Fields().Slice() {
-			if types.Haspointers(t1.Type) {
+			if t1.Type.HasPointers() {
 				lastPtrField = t1
 			}
 		}
@@ -1734,7 +1734,7 @@ func fillptrmask(t *types.Type, ptrmask []byte) {
 	for i := range ptrmask {
 		ptrmask[i] = 0
 	}
-	if !types.Haspointers(t) {
+	if !t.HasPointers() {
 		return
 	}
 
@@ -1803,7 +1803,7 @@ func (p *GCProg) end() {
 
 func (p *GCProg) emit(t *types.Type, offset int64) {
 	dowidth(t)
-	if !types.Haspointers(t) {
+	if !t.HasPointers() {
 		return
 	}
 	if t.Width == int64(Widthptr) {

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

@@ -4207,7 +4207,7 @@ func (s *state) openDeferSave(n *Node, t *types.Type, val *ssa.Value) *ssa.Value
 		s.vars[&memVar] = s.newValue1Apos(ssa.OpVarLive, types.TypeMem, argTemp, s.mem(), false)
 		addrArgTemp = s.newValue2Apos(ssa.OpLocalAddr, types.NewPtr(argTemp.Type), argTemp, s.sp, s.mem(), false)
 	}
-	if types.Haspointers(t) {
+	if t.HasPointers() {
 		// Since we may use this argTemp during exit depending on the
 		// deferBits, we must define it unconditionally on entry.
 		// Therefore, we must make sure it is zeroed out in the entry
@@ -4309,12 +4309,12 @@ func (s *state) openDeferExit() {
 			s.vars[&memVar] = s.newValue1Apos(ssa.OpVarLive, types.TypeMem, r.closureNode, s.mem(), false)
 		}
 		if r.rcvrNode != nil {
-			if types.Haspointers(r.rcvrNode.Type) {
+			if r.rcvrNode.Type.HasPointers() {
 				s.vars[&memVar] = s.newValue1Apos(ssa.OpVarLive, types.TypeMem, r.rcvrNode, s.mem(), false)
 			}
 		}
 		for _, argNode := range r.argNodes {
-			if types.Haspointers(argNode.Type) {
+			if argNode.Type.HasPointers() {
 				s.vars[&memVar] = s.newValue1Apos(ssa.OpVarLive, types.TypeMem, argNode, s.mem(), false)
 			}
 		}
@@ -4954,7 +4954,7 @@ func (s *state) rtcall(fn *obj.LSym, returns bool, results []*types.Type, args .
 func (s *state) storeType(t *types.Type, left, right *ssa.Value, skip skipMask, leftIsStmt bool) {
 	s.instrument(t, left, true)
 
-	if skip == 0 && (!types.Haspointers(t) || ssa.IsStackAddr(left)) {
+	if skip == 0 && (!t.HasPointers() || ssa.IsStackAddr(left)) {
 		// Known to not have write barrier. Store the whole type.
 		s.vars[&memVar] = s.newValue3Apos(ssa.OpStore, types.TypeMem, t, left, right, s.mem(), leftIsStmt)
 		return
@@ -4966,7 +4966,7 @@ func (s *state) storeType(t *types.Type, left, right *ssa.Value, skip skipMask,
 	// TODO: if the writebarrier pass knows how to reorder stores,
 	// we can do a single store here as long as skip==0.
 	s.storeTypeScalars(t, left, right, skip)
-	if skip&skipPtr == 0 && types.Haspointers(t) {
+	if skip&skipPtr == 0 && t.HasPointers() {
 		s.storeTypePtrs(t, left, right)
 	}
 }
@@ -5038,7 +5038,7 @@ func (s *state) storeTypePtrs(t *types.Type, left, right *ssa.Value) {
 		n := t.NumFields()
 		for i := 0; i < n; i++ {
 			ft := t.FieldType(i)
-			if !types.Haspointers(ft) {
+			if !ft.HasPointers() {
 				continue
 			}
 			addr := s.newValue1I(ssa.OpOffPtr, ft.PtrTo(), t.FieldOff(i), left)

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

@@ -381,9 +381,9 @@ func convFuncName(from, to *types.Type) (fnname string, needsaddr bool) {
 		switch {
 		case from.Size() == 2 && from.Align == 2:
 			return "convT16", false
-		case from.Size() == 4 && from.Align == 4 && !types.Haspointers(from):
+		case from.Size() == 4 && from.Align == 4 && !from.HasPointers():
 			return "convT32", false
-		case from.Size() == 8 && from.Align == types.Types[TUINT64].Align && !types.Haspointers(from):
+		case from.Size() == 8 && from.Align == types.Types[TUINT64].Align && !from.HasPointers():
 			return "convT64", false
 		}
 		if sc := from.SoleComponent(); sc != nil {
@@ -397,12 +397,12 @@ func convFuncName(from, to *types.Type) (fnname string, needsaddr bool) {
 
 		switch tkind {
 		case 'E':
-			if !types.Haspointers(from) {
+			if !from.HasPointers() {
 				return "convT2Enoptr", true
 			}
 			return "convT2E", true
 		case 'I':
-			if !types.Haspointers(from) {
+			if !from.HasPointers() {
 				return "convT2Inoptr", true
 			}
 			return "convT2I", true
@@ -1410,7 +1410,7 @@ opswitch:
 		copylen := nod(OLEN, n.Right, nil)
 		copyptr := nod(OSPTR, n.Right, nil)
 
-		if !types.Haspointers(t.Elem()) && n.Bounded() {
+		if !t.Elem().HasPointers() && n.Bounded() {
 			// When len(to)==len(from) and elements have no pointers:
 			// replace make+copy with runtime.mallocgc+runtime.memmove.
 
@@ -2865,7 +2865,7 @@ func isAppendOfMake(n *Node) bool {
 //     s = s[:n]
 //     lptr := &l1[0]
 //     sptr := &s[0]
-//     if lptr == sptr || !hasPointers(T) {
+//     if lptr == sptr || !T.HasPointers() {
 //       // growslice did not clear the whole underlying array (or did not get called)
 //       hp := &s[len(l1)]
 //       hn := l2 * sizeof(T)
@@ -2946,7 +2946,7 @@ func extendslice(n *Node, init *Nodes) *Node {
 	hn = conv(hn, types.Types[TUINTPTR])
 
 	clrname := "memclrNoHeapPointers"
-	hasPointers := types.Haspointers(elemtype)
+	hasPointers := elemtype.HasPointers()
 	if hasPointers {
 		clrname = "memclrHasPointers"
 		Curfn.Func.setWBPos(n.Pos)

src/cmd/compile/internal/types/type.go

@@ -1401,11 +1401,11 @@ func (t *Type) IsUntyped() bool {
 // TODO(austin): We probably only need HasHeapPointer. See
 // golang.org/cl/73412 for discussion.
 
-func Haspointers(t *Type) bool {
+func (t *Type) HasPointers() bool {
-	return Haspointers1(t, false)
+	return t.hasPointers1(false)
 }
 
-func Haspointers1(t *Type, ignoreNotInHeap bool) bool {
+func (t *Type) hasPointers1(ignoreNotInHeap bool) bool {
 	switch t.Etype {
 	case TINT, TUINT, TINT8, TUINT8, TINT16, TUINT16, TINT32, TUINT32, TINT64,
 		TUINT64, TUINTPTR, TFLOAT32, TFLOAT64, TCOMPLEX64, TCOMPLEX128, TBOOL, TSSA:
@@ -1415,11 +1415,11 @@ func Haspointers1(t *Type, ignoreNotInHeap bool) bool {
 		if t.NumElem() == 0 { // empty array has no pointers
 			return false
 		}
-		return Haspointers1(t.Elem(), ignoreNotInHeap)
+		return t.Elem().hasPointers1(ignoreNotInHeap)
 
 	case TSTRUCT:
 		for _, t1 := range t.Fields().Slice() {
-			if Haspointers1(t1.Type, ignoreNotInHeap) {
+			if t1.Type.hasPointers1(ignoreNotInHeap) {
 				return true
 			}
 		}
@@ -1430,7 +1430,7 @@ func Haspointers1(t *Type, ignoreNotInHeap bool) bool {
 
 	case TTUPLE:
 		ttup := t.Extra.(*Tuple)
-		return Haspointers1(ttup.first, ignoreNotInHeap) || Haspointers1(ttup.second, ignoreNotInHeap)
+		return ttup.first.hasPointers1(ignoreNotInHeap) || ttup.second.hasPointers1(ignoreNotInHeap)
 	}
 
 	return true
@@ -1440,7 +1440,7 @@ func Haspointers1(t *Type, ignoreNotInHeap bool) bool {
 // This is used for write barrier insertion, so it ignores
 // pointers to go:notinheap types.
 func (t *Type) HasHeapPointer() bool {
-	return Haspointers1(t, true)
+	return t.hasPointers1(true)
 }
 
 func (t *Type) Symbol() *obj.LSym {
@@ -1471,7 +1471,7 @@ func FakeRecvType() *Type {
 }
 
 var (
-	// TSSA types. Haspointers assumes these are pointer-free.
+	// TSSA types. HasPointers assumes these are pointer-free.
 	TypeInvalid = newSSA("invalid")
 	TypeMem     = newSSA("mem")
 	TypeFlags   = newSSA("flags")