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cmd/vet: remove dependency on types.New 

In preparation for removal of types.New.

Change-Id: Ieff0c41cf03351124cea32e9b96075a4801c051f
Reviewed-on: https://go-review.googlesource.com/10775
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Robert Griesemer 2015-06-05 12:18:13 -07:00
parent de24c4870a
commit f0b0213b21
1 changed files with 13 additions and 8 deletions
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21
cmd/vet/types.go
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@ -18,15 +18,19 @@ import (
var imports = make(map[string]*types.Package) var imports = make(map[string]*types.Package)
var ( var (
stringerMethodType = types.New("func() string") errorType *types.Interface
errorType = types.New("error").Underlying().(*types.Interface) stringerType *types.Interface
stringerType = types.New("interface{ String() string }").(*types.Interface) formatterType *types.Interface
formatterType *types.Interface
) )
func init() { func init() {
typ := importType("fmt", "Formatter") errorType = types.Universe.Lookup("error").Type().Underlying().(*types.Interface)
if typ != nil {
if typ := importType("fmt", "Stringer"); typ != nil {
stringerType = typ.Underlying().(*types.Interface)
}
if typ := importType("fmt", "Formatter"); typ != nil {
formatterType = typ.Underlying().(*types.Interface) formatterType = typ.Underlying().(*types.Interface)
} }
} }
@ -313,8 +317,9 @@ func (f *File) numArgsInSignature(call *ast.CallExpr) int {
func (f *File) isErrorMethodCall(call *ast.CallExpr) bool { func (f *File) isErrorMethodCall(call *ast.CallExpr) bool {
typ := f.pkg.types[call].Type typ := f.pkg.types[call].Type
if typ != nil { if typ != nil {
// We know it's called "Error", so just check the function signature. // We know it's called "Error", so just check the function signature
return types.Identical(f.pkg.types[call.Fun].Type, stringerMethodType) // (stringerType has exactly one method, String).
return types.Identical(f.pkg.types[call.Fun].Type, stringerType.Method(0).Type())
} }
// Without types, we can still check by hand. // Without types, we can still check by hand.
// Is it a selector expression? Otherwise it's a function call, not a method call. // Is it a selector expression? Otherwise it's a function call, not a method call.