Function opcodeCodeSeparator

txscript/opcode.go:1953–1961

opcodeCodeSeparator stores the current script offset as the most recently seen OP_CODESEPARATOR which is used during signature checking. This opcode does not change the contents of the data stack. The non-segwit ScriptVerifyConstScriptCode rejection is enforced in executeOpcode before this handler

(op *opcode, data []byte, vm *Engine)

// executeOpcode before this handler is dispatched, so it is not
// re-checked here.
func opcodeCodeSeparator(op *opcode, data []byte, vm *Engine) error {
	vm.lastCodeSep = int(vm.tokenizer.ByteIndex())

	if vm.taprootCtx != nil {
		vm.taprootCtx.codeSepPos = uint32(vm.tokenizer.OpcodePosition())
	}

	return nil
}

// opcodeCheckSig treats the top 2 items on the stack as a public key and a
// signature and replaces them with a bool which indicates if the signature was