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vet: Broaden suppression of recursive stringer warning.

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Updates golang/go#6212.

LGTM=r, gri
R=r, gri
CC=golang-codereviews
https://golang.org/cl/75130043
This commit is contained in:
David Symonds 2014-03-13 11:19:34 +11:00
parent 1a2b7a26cc
commit d4c8d5dae3
3 changed files with 17 additions and 11 deletions
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9
cmd/vet/print.go
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@ -408,6 +408,15 @@ func (f *File) recursiveStringer(e ast.Expr) bool {
obj = id.Obj
}
}
// It's unlikely to be a recursive stringer if it has a Format method.
if typ := f.pkg.types[e].Type; typ != nil {
// Not a perfect match; see issue 6259.
if f.hasMethod(typ, "Format") {
return false
}
}
// We compare the underlying Object, which checks that the identifier
// is the one we declared as the receiver for the String method in
// which this printf appears.

2
cmd/vet/testdata/print.go vendored
View File

@ -123,7 +123,7 @@ func PrintfTests() {
fmt.Printf("%t", stringerarrayv) // ERROR "arg stringerarrayv for printf verb %t of wrong type"
fmt.Printf("%t", notstringerarrayv) // ERROR "arg notstringerarrayv for printf verb %t of wrong type"
fmt.Printf("%q", notstringerarrayv) // ERROR "arg notstringerarrayv for printf verb %q of wrong type"
fmt.Printf("%d", Formatter(true)) // ERROR "arg Formatter\(true\) for printf verb %d of wrong type"
fmt.Printf("%d", Formatter(true)) // correct (the type is responsible for formatting)
fmt.Printf("%s", nonemptyinterface) // correct (the dynamic type of nonemptyinterface may be a stringer)
fmt.Printf("%.*s %d %g", 3, "hi", 23, 'x') // ERROR "arg 'x' for printf verb %g of wrong type"
fmt.Println() // not an error

17
cmd/vet/types.go
View File

@ -103,7 +103,7 @@ func (f *File) matchArgTypeInternal(t printfArgType, typ types.Type, arg ast.Exp
// if its method set contains a Format function. We could do better,
// even now, but we don't need to be 100% accurate. Wait for 6259 to
// be fixed instead. TODO.
if hasMethod(typ, "Format") {
if f.hasMethod(typ, "Format") {
return true
}
// If we can use a string, might arg (dynamically) implement the Stringer or Error interface?
@ -313,13 +313,10 @@ func (f *File) isErrorMethodCall(call *ast.CallExpr) bool {
// hasMethod reports whether the type contains a method with the given name.
// It is part of the workaround for Formatters and should be deleted when
// that workaround is no longer necessary. TODO: delete when fixed.
func hasMethod(typ types.Type, name string) bool {
set := types.NewMethodSet(typ)
for i := 0; i < set.Len(); i++ {
if set.At(i).Obj().Name() == name {
return true
}
}
return false
// that workaround is no longer necessary.
// TODO: This could be better once issue 6259 is fixed.
func (f *File) hasMethod(typ types.Type, name string) bool {
obj, _, _ := types.LookupFieldOrMethod(typ, f.pkg.typesPkg, name)
_, ok := obj.(*types.Func)
return ok
}