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cmd/compile/internal/types2: remove report parameter from infer and inferB

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This is a clean port of CL 350049 from go/types to types2.

Change-Id: Ifc8551a772535f7b8e943bfbd9febbb78333fa68
Reviewed-on: https://go-review.googlesource.com/c/go/+/351169
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Robert Griesemer 2021-09-20 20:28:01 -07:00
parent 2f70ce36d7
commit 1367a60b06
2 changed files with 9 additions and 18 deletions
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4
src/cmd/compile/internal/types2/call.go
View File

@ -41,7 +41,7 @@ func (check *Checker) funcInst(x *operand, inst *syntax.IndexExpr) {
// if we don't have enough type arguments, try type inference
inferred := false
if got < want {
targs = check.infer(inst.Pos(), sig.TypeParams().list(), targs, nil, nil, true)
targs = check.infer(inst.Pos(), sig.TypeParams().list(), targs, nil, nil)
if targs == nil {
// error was already reported
x.mode = invalid
@ -338,7 +338,7 @@ func (check *Checker) arguments(call *syntax.CallExpr, sig *Signature, targs []T
}
// TODO(gri) provide position information for targs so we can feed
// it to the instantiate call for better error reporting
targs := check.infer(call.Pos(), sig.TypeParams().list(), targs, sigParams, args, true)
targs := check.infer(call.Pos(), sig.TypeParams().list(), targs, sigParams, args)
if targs == nil {
return // error already reported
}

23
src/cmd/compile/internal/types2/infer.go
View File

@ -28,9 +28,7 @@ const useConstraintTypeInference = true
// 3) Infer type arguments from untyped function arguments.
//
// Constraint type inference is used after each step to expand the set of type arguments.
//
// TODO(gri): remove the report parameter: is no longer needed.
func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type, params *Tuple, args []*operand, report bool) (result []Type) {
func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type, params *Tuple, args []*operand) (result []Type) {
if debug {
defer func() {
assert(result == nil || len(result) == len(tparams))
@ -62,7 +60,7 @@ func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type,
// If we have type arguments, see how far we get with constraint type inference.
if len(targs) > 0 && useConstraintTypeInference {
var index int
targs, index = check.inferB(tparams, targs, report)
targs, index = check.inferB(tparams, targs)
if targs == nil || index < 0 {
return targs
}
@ -107,9 +105,6 @@ func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type,
}
errorf := func(kind string, tpar, targ Type, arg *operand) {
if !report {
return
}
// provide a better error message if we can
targs, index := u.x.types()
if index == 0 {
@ -176,7 +171,7 @@ func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type,
// Note that even if we don't have any type arguments, constraint type inference
// may produce results for constraints that explicitly specify a type.
if useConstraintTypeInference {
targs, index = check.inferB(tparams, targs, report)
targs, index = check.inferB(tparams, targs)
if targs == nil || index < 0 {
return targs
}
@ -214,7 +209,7 @@ func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type,
// Again, follow up with constraint type inference.
if useConstraintTypeInference {
targs, index = check.inferB(tparams, targs, report)
targs, index = check.inferB(tparams, targs)
if targs == nil || index < 0 {
return targs
}
@ -223,9 +218,7 @@ func (check *Checker) infer(pos syntax.Pos, tparams []*TypeParam, targs []Type,
// At least one type argument couldn't be inferred.
assert(targs != nil && index >= 0 && targs[index] == nil)
tpar := tparams[index]
if report {
check.errorf(pos, "cannot infer %s (%s) (%s)", tpar.obj.name, tpar.obj.pos, targs)
}
check.errorf(pos, "cannot infer %s (%s) (%s)", tpar.obj.name, tpar.obj.pos, targs)
return nil
}
@ -367,7 +360,7 @@ func (w *tpWalker) isParameterizedTypeList(list []Type) bool {
// first type argument in that list that couldn't be inferred (and thus is nil). If all
// type arguments were inferred successfully, index is < 0. The number of type arguments
// provided may be less than the number of type parameters, but there must be at least one.
func (check *Checker) inferB(tparams []*TypeParam, targs []Type, report bool) (types []Type, index int) {
func (check *Checker) inferB(tparams []*TypeParam, targs []Type) (types []Type, index int) {
assert(len(tparams) >= len(targs) && len(targs) > 0)
// Setup bidirectional unification between those structural bounds
@ -389,9 +382,7 @@ func (check *Checker) inferB(tparams []*TypeParam, targs []Type, report bool) (t
sbound := typ.structuralType()
if sbound != nil {
if !u.unify(typ, sbound) {
if report {
check.errorf(tpar.obj, "%s does not match %s", tpar.obj, sbound)
}
check.errorf(tpar.obj, "%s does not match %s", tpar.obj, sbound)
return nil, 0
}
}