func lookupSym(dwarfData *dwarf.Data, name string) (uint64, error) {
r := dwarfData.Reader()
for {
entry, err := r.Next()
if err != nil {
return 0, err
}
if entry == nil {
// TODO: why don't we get an error here.
break
}
if entry.Tag != dwarf.TagSubprogram {
continue
}
nameAttr := lookupAttr(entry, dwarf.AttrName)
if nameAttr == nil {
// TODO: this shouldn't be possible.
continue
}
if nameAttr.(string) != name {
continue
}
addrAttr := lookupAttr(entry, dwarf.AttrLowpc)
if addrAttr == nil {
return 0, fmt.Errorf("symbol %q has no LowPC attribute", name)
}
addr, ok := addrAttr.(uint64)
if !ok {
return 0, fmt.Errorf("symbol %q has non-uint64 LowPC attribute", name)
}
return addr, nil
}
return 0, fmt.Errorf("symbol %q not found", name)
}
// New returns a reader for the specified dwarf data.
func New(data *dwarf.Data) *Reader {
return &Reader{data.Reader(), 0}
}