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|
package functions
import (
"go/token"
"go/types"
"honnef.co/go/tools/ssa"
)
func concreteReturnTypes(fn *ssa.Function) []*types.Tuple {
res := fn.Signature.Results()
if res == nil {
return nil
}
ifaces := make([]bool, res.Len())
any := false
for i := 0; i < res.Len(); i++ {
_, ifaces[i] = res.At(i).Type().Underlying().(*types.Interface)
any = any || ifaces[i]
}
if !any {
return []*types.Tuple{res}
}
var out []*types.Tuple
for _, block := range fn.Blocks {
if len(block.Instrs) == 0 {
continue
}
ret, ok := block.Instrs[len(block.Instrs)-1].(*ssa.Return)
if !ok {
continue
}
vars := make([]*types.Var, res.Len())
for i, v := range ret.Results {
var typ types.Type
if !ifaces[i] {
typ = res.At(i).Type()
} else if mi, ok := v.(*ssa.MakeInterface); ok {
// TODO(dh): if mi.X is a function call that returns
// an interface, call concreteReturnTypes on that
// function (or, really, go through Descriptions,
// avoid infinite recursion etc, just like nil error
// detection)
// TODO(dh): support Phi nodes
typ = mi.X.Type()
} else {
typ = res.At(i).Type()
}
vars[i] = types.NewParam(token.NoPos, nil, "", typ)
}
out = append(out, types.NewTuple(vars...))
}
// TODO(dh): deduplicate out
return out
}
|
