go-delve/delve · error

could not find rodata struct member

Error message

could not find rodata struct member

What it means

Error "could not find rodata struct member" thrown in go-delve/delve.

Source

Thrown at pkg/proc/bininfo.go:1818

	err := binary.Write(buf, binary.LittleEndian, &roDataAddr)
	if err != nil {
		return 0, err
	}
	// Here we search for the value of `go.func.*` by searching through the raw bytes of the
	// runtime.moduledata structure. Since we don't know the value that we are looking for,
	// we use a known value, in this case the address of the .rodata section.
	// This is because in the layout of the struct, the rodata member is right next to
	// the value we need, making the math trivial once we find that member.
	// We use `bytes.LastIndex` specifically because the `types` struct member can also
	// contain the address of the .rodata section, so this pointer can appear multiple times
	// in the raw bytes.
	// Yes, this is very ill-advised low-level hackery but it works fine until
	// https://github.com/golang/go/issues/58474#issuecomment-1785681472 happens.
	// This code path also only runs in stripped binaries, so the whole implementation is
	// best effort anyways.
	rodata := bytes.LastIndex(moduleData, buf.Bytes()[:ptrsize])
	if rodata == -1 {
		return 0, errors.New("could not find rodata struct member")
	}
	// Layout of struct members is:
	// type moduledata struct {
	// 	...
	// 	rodata uintptr
	// 	gofunc uintptr
	// 	...
	// }
	// So do some pointer arithmetic to get the value we need.
	gofuncval := binary.LittleEndian.Uint64(moduleData[rodata+(1*ptrsize) : rodata+(2*ptrsize)])
	return gofuncval, nil
}

func parseModuleData(dataSection []byte, tableAddr uint64) ([]byte, error) {
	buf := new(bytes.Buffer)
	err := binary.Write(buf, binary.LittleEndian, &tableAddr)
	if err != nil {
		return nil, err

View on GitHub (pinned to a23773e6c3)

When it happens

Trigger: Thrown at pkg/proc/bininfo.go:1818 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of go-delve/delve@a23773e6c3 (2026-08-31). Data as JSON: /api/errors/a9333a98cfa4fc1a. Report an issue: GitHub.