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go.tools/go/types: give Label objects a non-nil Package() too.

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New invariant: all user-defined objects have an associated package.
Added a check of this invariant to stdlib_test.

LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/104170043
This commit is contained in:
Alan Donovan 2014-06-16 12:31:46 -04:00
parent 6db8a00c75
commit 47c0a8f0c3
3 changed files with 21 additions and 4 deletions
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2
go/types/labels.go
View File

@ -131,7 +131,7 @@ func (check *Checker) blockBranches(all *Scope, parent *block, lstmt *ast.Labele
case *ast.LabeledStmt:
// declare non-blank label
if name := s.Label.Name; name != "_" {
lbl := NewLabel(s.Label.Pos(), name)
lbl := NewLabel(s.Label.Pos(), check.pkg, name)
if alt := all.Insert(lbl); alt != nil {
check.softErrorf(lbl.pos, "label %s already declared", name)
check.reportAltDecl(alt)

4
go/types/object.go
View File

@ -201,8 +201,8 @@ type Label struct {
object
}
func NewLabel(pos token.Pos, name string) *Label {
return &Label{object{pos: pos, name: name, typ: Typ[Invalid]}}
func NewLabel(pos token.Pos, pkg *Package, name string) *Label {
return &Label{object{pos: pos, pkg: pkg, name: name, typ: Typ[Invalid]}}
}
// A Builtin represents a built-in function.

19
go/types/stdlib_test.go
View File

@ -174,8 +174,25 @@ func typecheck(t *testing.T, path string, filenames []string) {
// typecheck package files
var conf Config
conf.Error = func(err error) { t.Error(err) }
conf.Check(path, fset, files, nil)
info := Info{Uses: make(map[*ast.Ident]Object)}
conf.Check(path, fset, files, &info)
pkgCount++
// Perform checks of API invariants.
// All Objects have a package, except predeclared ones.
errorError := Universe.Lookup("error").Type().Underlying().(*Interface).ExplicitMethod(0) // (error).Error
for id, obj := range info.Uses {
predeclared := obj == Universe.Lookup(obj.Name()) || obj == errorError
if predeclared == (obj.Pkg() != nil) {
posn := fset.Position(id.Pos())
if predeclared {
t.Errorf("%s: predeclared object with package: %s", posn, obj)
} else {
t.Errorf("%s: user-defined object without package: %s", posn, obj)
}
}
}
}
// pkgFilenames returns the list of package filenames for the given directory.