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internal/lsp: fix a few nil pointer exceptions in definition

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Jumping to the definition of a builtin function or basic kind would
cause a nil pointer because these have no position.

Change-Id: I043a61a148757b127ff1123c8429ce23858bd13a
Reviewed-on: https://go-review.googlesource.com/c/157597
Reviewed-by: Ian Cottrell <iancottrell@google.com>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
This commit is contained in:
Rebecca Stambler 2019-01-11 17:03:01 -05:00
parent 36f37f8f5c
commit bf090417da
2 changed files with 12 additions and 9 deletions
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6
internal/lsp/position.go
View File

@ -36,11 +36,11 @@ func fromProtocolLocation(ctx context.Context, v *cache.View, loc protocol.Locat
// toProtocolLocation converts from a source range back to a protocol location. // toProtocolLocation converts from a source range back to a protocol location.
func toProtocolLocation(fset *token.FileSet, r source.Range) protocol.Location { func toProtocolLocation(fset *token.FileSet, r source.Range) protocol.Location {
tokFile := fset.File(r.Start) tok := fset.File(r.Start)
uri := source.ToURI(tokFile.Name()) uri := source.ToURI(tok.Name())
return protocol.Location{ return protocol.Location{
URI: protocol.DocumentURI(uri), URI: protocol.DocumentURI(uri),
Range: toProtocolRange(tokFile, r), Range: toProtocolRange(tok, r),
} }
} }

15
internal/lsp/source/definition.go
View File

@ -36,15 +36,15 @@ func Definition(ctx context.Context, v View, f File, pos token.Pos) (Range, erro
return Range{}, fmt.Errorf("no object") return Range{}, fmt.Errorf("no object")
} }
if i.wasEmbeddedField { if i.wasEmbeddedField {
// the original position was on the embedded field declaration // The original position was on the embedded field declaration, so we
// so we try to dig out the type and jump to that instead // try to dig out the type and jump to that instead.
if v, ok := obj.(*types.Var); ok { if v, ok := obj.(*types.Var); ok {
if n, ok := v.Type().(*types.Named); ok { if n, ok := v.Type().(*types.Named); ok {
obj = n.Obj() obj = n.Obj()
} }
} }
} }
return objToRange(ctx, v, obj), nil return objToRange(ctx, v, obj)
} }
func TypeDefinition(ctx context.Context, v View, f File, pos token.Pos) (Range, error) { func TypeDefinition(ctx context.Context, v View, f File, pos token.Pos) (Range, error) {
@ -71,7 +71,7 @@ func TypeDefinition(ctx context.Context, v View, f File, pos token.Pos) (Range,
if obj == nil { if obj == nil {
return Range{}, fmt.Errorf("no object for type %s", typ.String()) return Range{}, fmt.Errorf("no object for type %s", typ.String())
} }
return objToRange(ctx, v, obj), nil return objToRange(ctx, v, obj)
} }
func typeToObject(typ types.Type) (obj types.Object) { func typeToObject(typ types.Type) (obj types.Object) {
@ -129,8 +129,11 @@ func checkIdentifier(f *ast.File, pos token.Pos) (ident, error) {
return result, nil return result, nil
} }
func objToRange(ctx context.Context, v View, obj types.Object) Range { func objToRange(ctx context.Context, v View, obj types.Object) (Range, error) {
p := obj.Pos() p := obj.Pos()
if !p.IsValid() {
return Range{}, fmt.Errorf("invalid position for %v", obj.Name())
}
tok := v.FileSet().File(p) tok := v.FileSet().File(p)
pos := tok.Position(p) pos := tok.Position(p)
if pos.Column == 1 { if pos.Column == 1 {
@ -161,7 +164,7 @@ Return:
return Range{ return Range{
Start: p, Start: p,
End: p + token.Pos(identifierLen(obj.Name())), End: p + token.Pos(identifierLen(obj.Name())),
} }, nil
} }
// TODO: This needs to be fixed to address golang.org/issue/29149. // TODO: This needs to be fixed to address golang.org/issue/29149.