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go/types: simplify Checker.funcInst

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This is a port of CL 306169 to go/types, adjusted only for use of the
typeparams package, and the different positioning API.

Change-Id: I3095f4b0dae4473e75ec2a988ea282bac1a4bab3
Reviewed-on: https://go-review.googlesource.com/c/go/+/312189
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>
This commit is contained in:
Rob Findley 2021-04-20 22:23:14 -04:00 committed by Robert Findley
parent 39785912b9
commit 614a9c2613
1 changed files with 9 additions and 28 deletions
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37
src/go/types/call.go
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@ -17,42 +17,31 @@ import (
// funcInst type-checks a function instantiaton inst and returns the result in x.
// The operand x must be the evaluation of inst.X and its type must be a signature.
func (check *Checker) funcInst(x *operand, inst *ast.IndexExpr) {
exprs := typeparams.UnpackExpr(inst.Index)
args, ok := check.exprOrTypeList(exprs)
if !ok {
xlist := typeparams.UnpackExpr(inst.Index)
targs := check.typeList(xlist)
if targs == nil {
x.mode = invalid
x.expr = inst
return
}
if len(args) > 0 && args[0].mode != typexpr {
check.errorf(args[0], _NotAType, "%s is not a type", args[0])
ok = false
}
assert(len(targs) == len(xlist))
// check number of type arguments
n := len(args)
n := len(targs)
sig := x.typ.(*Signature)
if n > len(sig.tparams) {
check.errorf(args[n-1], _Todo, "got %d type arguments but want %d", n, len(sig.tparams))
check.errorf(xlist[n-1], _Todo, "got %d type arguments but want %d", n, len(sig.tparams))
x.mode = invalid
x.expr = inst
return
}
// collect types
targs := make([]Type, n)
// determine argument positions (for error reporting)
// TODO(rFindley) use a positioner here? instantiate would need to be
// updated accordingly.
poslist := make([]token.Pos, n)
for i, a := range args {
if a.mode != typexpr {
// error was reported earlier
x.mode = invalid
x.expr = inst
return
}
targs[i] = a.typ
poslist[i] = a.Pos()
for i, x := range xlist {
poslist[i] = x.Pos()
}
// if we don't have enough type arguments, use constraint type inference
@ -87,14 +76,6 @@ func (check *Checker) funcInst(x *operand, inst *ast.IndexExpr) {
assert(n == len(sig.tparams))
// instantiate function signature
for i, typ := range targs {
// some positions may be missing if types are inferred
var pos token.Pos
if i < len(poslist) {
pos = poslist[i]
}
check.ordinaryType(atPos(pos), typ)
}
res := check.instantiate(x.Pos(), sig, targs, poslist).(*Signature)
assert(res.tparams == nil) // signature is not generic anymore
if inferred {