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[dev.typeparams] cmd/compile/internal/types2: implement TypeParam.Constraint

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Change-Id: I95a96f9dbd199cee3a4be8f42cd64e7f44ba5e5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/336989
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Robert Griesemer 2021-07-23 10:26:07 -07:00
parent 9e3274bb3d
commit d6753fd491
1 changed files with 20 additions and 12 deletions
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32
src/cmd/compile/internal/types2/typeparam.go
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@ -53,20 +53,28 @@ func (t *TypeParam) SetId(id uint64) {
t.id = id
}
// Constraint returns the type constraint specified for t.
func (t *TypeParam) Constraint() Type {
// compute the type set if possible (we may not have an interface)
if iface, _ := under(t.bound).(*Interface); iface != nil {
// use the type bound position if we have one
pos := nopos
if n, _ := t.bound.(*Named); n != nil {
pos = n.obj.pos
}
computeTypeSet(t.check, pos, iface)
}
return t.bound
}
// Bound returns the underlying type of the type parameter's
// constraint.
// Deprecated for external use. Use Constraint instead.
func (t *TypeParam) Bound() *Interface {
// we may not have an interface (error reported elsewhere)
iface, _ := under(t.bound).(*Interface)
if iface == nil {
return &emptyInterface
if iface, _ := under(t.Constraint()).(*Interface); iface != nil {
return iface
}
// use the type bound position if we have one
pos := nopos
if n, _ := t.bound.(*Named); n != nil {
pos = n.obj.pos
}
// TODO(gri) switch this to an unexported method on Checker.
computeTypeSet(t.check, pos, iface)
return iface
return &emptyInterface
}
func (t *TypeParam) SetBound(bound Type) {