func findVariable(d *dwarf.Data, name string) (*variable, error) {
dr := d.Reader()
for {
e, err := dr.Next()
if e == nil || err != nil {
return nil, err
}
if e.Tag != dwarf.TagVariable {
continue
}
aname, ok := e.Val(dwarf.AttrName).(string)
if !ok || aname != name {
continue
}
loc, ok := e.Val(dwarf.AttrLocation).([]uint8)
if !ok {
continue
}
if loc[0] != 3 {
return nil, fmt.Errorf("can't determine variable addr")
}
addr := uint64(0)
switch len(loc) {
case 5:
addr = uint64(binary.LittleEndian.Uint32(loc[1:]))
case 9:
addr = uint64(binary.LittleEndian.Uint64(loc[1:]))
default:
return nil, fmt.Errorf("unknown addr size")
}
off, ok := e.Val(dwarf.AttrType).(dwarf.Offset)
if !ok {
continue
}
typ, err := d.Type(off)
if err != nil {
return nil, err
}
return &variable{Addr: addr, Type: typ}, nil
}
return nil, nil
}
