func symbolize(vmlinux string, pcs []uint64) ([]symbolizer.Frame, string, error) {
symb := symbolizer.NewSymbolizer()
defer symb.Close()
frames, err := symb.SymbolizeArray(vmlinux, pcs)
if err != nil {
return nil, "", err
}
prefix := ""
for i := range frames {
frame := &frames[i]
frame.PC--
if prefix == "" {
prefix = frame.File
} else {
i := 0
for ; i < len(prefix) && i < len(frame.File); i++ {
if prefix[i] != frame.File[i] {
break
}
}
prefix = prefix[:i]
}
}
return frames, prefix, nil
}
func Symbolize(vmlinux string, text []byte) ([]byte, error) {
var symbolized []byte
symbols, err := symbolizer.ReadSymbols(vmlinux)
if err != nil {
return nil, err
}
symb := symbolizer.NewSymbolizer()
defer symb.Close()
symbFunc := func(bin string, pc uint64) ([]symbolizer.Frame, error) {
return symb.Symbolize(bin, pc)
}
// Strip vmlinux location from all paths.
strip, _ := filepath.Abs(vmlinux)
strip = filepath.Dir(strip) + string(filepath.Separator)
// Vmlinux may have been moved, so check if we can find debug info
// for __sanitizer_cov_trace_pc. We know where it is located,
// so we can infer correct strip prefix from it.
if covSymbols := symbols["__sanitizer_cov_trace_pc"]; len(covSymbols) != 0 {
for _, covSymb := range covSymbols {
frames, _ := symb.Symbolize(vmlinux, covSymb.Addr)
if len(frames) > 0 {
file := frames[len(frames)-1].File
if idx := strings.Index(file, "kernel/kcov.c"); idx != -1 {
strip = file[:idx]
break
}
}
}
}
s := bufio.NewScanner(bytes.NewReader(text))
for s.Scan() {
line := append([]byte{}, s.Bytes()...)
line = append(line, '\n')
line = symbolizeLine(symbFunc, symbols, vmlinux, strip, line)
symbolized = append(symbolized, line...)
}
return symbolized, nil
}