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go/types, types2: slightly simplify rangeKeyVal function
Compute the signature type of an iterator function argument only once. This eliminates the need for two separate toSig calls. Change-Id: Ifeb33d21e381010d2012d74eac045856f1cca312 Reviewed-on: https://go-review.googlesource.com/c/go/+/613635 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Robert Griesemer <gri@google.com> Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Tim King <taking@google.com>
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@ -1010,10 +1010,6 @@ func rangeKeyVal(typ Type, allowVersion func(goVersion) bool) (key, val Type, ca
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bad := func(cause string) (Type, Type, string, bool) {
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return Typ[Invalid], Typ[Invalid], cause, false
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}
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toSig := func(t Type) *Signature {
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sig, _ := coreType(t).(*Signature)
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return sig
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}
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orig := typ
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switch typ := arrayPtrDeref(coreType(typ)).(type) {
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@ -1044,23 +1040,26 @@ func rangeKeyVal(typ Type, allowVersion func(goVersion) bool) (key, val Type, ca
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if !buildcfg.Experiment.RangeFunc && allowVersion != nil && !allowVersion(go1_23) {
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return bad("requires go1.23 or later")
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}
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assert(typ.Recv() == nil)
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// check iterator arity
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switch {
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case typ.Params().Len() != 1:
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return bad("func must be func(yield func(...) bool): wrong argument count")
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case toSig(typ.Params().At(0).Type()) == nil:
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return bad("func must be func(yield func(...) bool): argument is not func")
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case typ.Results().Len() != 0:
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return bad("func must be func(yield func(...) bool): unexpected results")
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}
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cb := toSig(typ.Params().At(0).Type())
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assert(cb.Recv() == nil)
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assert(typ.Recv() == nil)
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// check iterator argument type
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cb, _ := coreType(typ.Params().At(0).Type()).(*Signature)
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switch {
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case cb == nil:
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return bad("func must be func(yield func(...) bool): argument is not func")
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case cb.Params().Len() > 2:
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return bad("func must be func(yield func(...) bool): yield func has too many parameters")
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case cb.Results().Len() != 1 || !isBoolean(cb.Results().At(0).Type()):
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return bad("func must be func(yield func(...) bool): yield func does not return bool")
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}
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assert(cb.Recv() == nil)
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// determine key and value types, if any
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if cb.Params().Len() >= 1 {
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key = cb.Params().At(0).Type()
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}
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@ -1028,10 +1028,6 @@ func rangeKeyVal(typ Type, allowVersion func(goVersion) bool) (key, val Type, ca
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bad := func(cause string) (Type, Type, string, bool) {
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return Typ[Invalid], Typ[Invalid], cause, false
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}
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toSig := func(t Type) *Signature {
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sig, _ := coreType(t).(*Signature)
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return sig
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}
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orig := typ
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switch typ := arrayPtrDeref(coreType(typ)).(type) {
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@ -1062,23 +1058,26 @@ func rangeKeyVal(typ Type, allowVersion func(goVersion) bool) (key, val Type, ca
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if !buildcfg.Experiment.RangeFunc && allowVersion != nil && !allowVersion(go1_23) {
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return bad("requires go1.23 or later")
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}
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assert(typ.Recv() == nil)
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// check iterator arity
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switch {
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case typ.Params().Len() != 1:
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return bad("func must be func(yield func(...) bool): wrong argument count")
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case toSig(typ.Params().At(0).Type()) == nil:
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return bad("func must be func(yield func(...) bool): argument is not func")
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case typ.Results().Len() != 0:
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return bad("func must be func(yield func(...) bool): unexpected results")
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}
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cb := toSig(typ.Params().At(0).Type())
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assert(cb.Recv() == nil)
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assert(typ.Recv() == nil)
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// check iterator argument type
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cb, _ := coreType(typ.Params().At(0).Type()).(*Signature)
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switch {
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case cb == nil:
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return bad("func must be func(yield func(...) bool): argument is not func")
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case cb.Params().Len() > 2:
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return bad("func must be func(yield func(...) bool): yield func has too many parameters")
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case cb.Results().Len() != 1 || !isBoolean(cb.Results().At(0).Type()):
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return bad("func must be func(yield func(...) bool): yield func does not return bool")
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}
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assert(cb.Recv() == nil)
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// determine key and value types, if any
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if cb.Params().Len() >= 1 {
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key = cb.Params().At(0).Type()
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}
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