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[dev.typeparams] go/types: (TypeParam) SetBound -> SetConstraint
This is a straightforward port of CL 338196 to go/types, minus the deprecated TypeParam.Bound() method (since it is not needed), plus an adjustment for methodset.go. Change-Id: Ie372bfeec245094102a2c3257a43499d75981447 Reviewed-on: https://go-review.googlesource.com/c/go/+/339675 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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@ -826,7 +826,7 @@ func (check *Checker) applyTypeFunc(f func(Type) Type, x Type) Type {
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// type and collect possible result types at the same time.
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var rtypes []Type
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var tildes []bool
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if !tp.Bound().is(func(typ Type, tilde bool) bool {
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if !tp.iface().is(func(typ Type, tilde bool) bool {
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if r := f(typ); r != nil {
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rtypes = append(rtypes, r)
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tildes = append(tildes, tilde)
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@ -482,7 +482,7 @@ func (check *Checker) selector(x *operand, e *ast.SelectorExpr) {
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var why string
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if tpar := asTypeParam(x.typ); tpar != nil {
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// Type parameter bounds don't specify fields, so don't mention "field".
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if tname := tpar.Bound().obj; tname != nil {
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if tname := tpar.iface().obj; tname != nil {
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why = check.sprintf("interface %s has no method %s", tname.name, sel)
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} else {
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why = check.sprintf("type bound for %s has no method %s", x.typ, sel)
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@ -162,7 +162,7 @@ func (check *Checker) verify(pos token.Pos, tparams []*TypeName, targs []Type, p
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// A suitable error is reported if the result is false.
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// TODO(gri) This should be a method of interfaces or type sets.
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func (check *Checker) satisfies(pos token.Pos, targ Type, tpar *TypeParam, smap *substMap) bool {
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iface := tpar.Bound()
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iface := tpar.iface()
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if iface.Empty() {
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return true // no type bound
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}
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@ -176,7 +176,7 @@ func (check *Checker) satisfies(pos token.Pos, targ Type, tpar *TypeParam, smap
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// if iface is comparable, targ must be comparable
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// TODO(gri) the error messages needs to be better, here
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if iface.IsComparable() && !Comparable(targ) {
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if tpar := asTypeParam(targ); tpar != nil && tpar.Bound().typeSet().IsTop() {
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if tpar := asTypeParam(targ); tpar != nil && tpar.iface().typeSet().IsTop() {
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check.softErrorf(atPos(pos), _Todo, "%s has no constraints", targ)
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return false
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}
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@ -222,7 +222,7 @@ func (check *Checker) satisfies(pos token.Pos, targ Type, tpar *TypeParam, smap
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// If targ is itself a type parameter, each of its possible types, but at least one, must be in the
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// list of iface types (i.e., the targ type list must be a non-empty subset of the iface types).
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if targ := asTypeParam(targ); targ != nil {
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targBound := targ.Bound()
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targBound := targ.iface()
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if targBound.typeSet().types == nil {
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check.softErrorf(atPos(pos), _Todo, "%s does not satisfy %s (%s has no type constraints)", targ, tpar.bound, targ)
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return false
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@ -190,7 +190,7 @@ func lookupFieldOrMethod(T Type, addressable bool, pkg *Package, name string) (o
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}
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case *TypeParam:
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if i, m := t.Bound().typeSet().LookupMethod(pkg, name); m != nil {
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if i, m := t.iface().typeSet().LookupMethod(pkg, name); m != nil {
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assert(m.typ != nil)
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index = concat(e.index, i)
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if obj != nil || e.multiples {
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@ -160,7 +160,7 @@ func NewMethodSet(T Type) *MethodSet {
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mset = mset.add(t.typeSet().methods, e.index, true, e.multiples)
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case *TypeParam:
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mset = mset.add(t.Bound().typeSet().methods, e.index, true, e.multiples)
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mset = mset.add(t.iface().typeSet().methods, e.index, true, e.multiples)
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}
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}
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@ -113,7 +113,7 @@ func comparable(T Type, seen map[Type]bool) bool {
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case *Array:
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return comparable(t.elem, seen)
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case *TypeParam:
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return t.Bound().IsComparable()
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return t.iface().IsComparable()
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}
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return false
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}
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@ -56,7 +56,7 @@ func optype(typ Type) Type {
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// for a type parameter list of the form:
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// (type T interface { type T }).
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// See also issue #39680.
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if a := t.Bound().typeSet().types; a != nil && a != typ {
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if a := t.iface().typeSet().types; a != nil && a != typ {
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// If we have a union with a single entry, ignore
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// any tilde because under(~t) == under(t).
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if u, _ := a.(*Union); u != nil && u.NumTerms() == 1 {
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@ -74,25 +74,22 @@ func (t *TypeParam) Constraint() Type {
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return t.bound
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}
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// Bound returns the underlying type of the type parameter's
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// constraint.
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// Deprecated for external use. Use Constraint instead.
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func (t *TypeParam) Bound() *Interface {
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// SetConstraint sets the type constraint for t.
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func (t *TypeParam) SetConstraint(bound Type) {
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if bound == nil {
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panic("types2.TypeParam.SetConstraint: bound must not be nil")
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}
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t.bound = bound
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}
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// iface returns the constraint interface of t.
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func (t *TypeParam) iface() *Interface {
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if iface, _ := under(t.Constraint()).(*Interface); iface != nil {
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return iface
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}
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return &emptyInterface
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}
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// TODO(rfindley): document the SetBound methods.
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func (t *TypeParam) SetBound(bound Type) {
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if bound == nil {
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panic("internal error: bound must not be nil")
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}
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t.bound = bound
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}
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func (t *TypeParam) Underlying() Type { return t }
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func (t *TypeParam) String() string { return TypeString(t, nil) }
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@ -135,5 +132,5 @@ func bindTParams(list []*TypeName) *TypeParams {
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// Implementation
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func (t *TypeParam) underIs(f func(Type) bool) bool {
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return t.Bound().typeSet().underIs(f)
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return t.iface().typeSet().underIs(f)
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}
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