debug/dwarf: return ErrUnknownPC rather than nil on unknown PC
Currently, on e == nil or e.Tag == 0, SeekPC returns with a nil error.
Instead, indicate that the PC is unknown.
Change-Id: I9594296034e2df872e399bd800b00cb565c413c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/473695
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
diff --git a/src/debug/dwarf/entry.go b/src/debug/dwarf/entry.go
index 5bb4297..f1215d2 100644
--- a/src/debug/dwarf/entry.go
+++ b/src/debug/dwarf/entry.go
@@ -975,9 +975,12 @@
u := &r.d.unit[unit]
r.b = makeBuf(r.d, u, "info", u.off, u.data)
e, err := r.Next()
- if err != nil || e == nil || e.Tag == 0 {
+ if err != nil {
return nil, err
}
+ if e == nil || e.Tag == 0 {
+ return nil, ErrUnknownPC
+ }
ranges, err := r.d.Ranges(e)
if err != nil {
return nil, err
