Error when generating PER descriptor containing reference to a constant in another module

Summary

ASN.1 type constraints can contain references to constants, which are generated into the C++ code if these constraints are relevant to PER. If the referenced constant is defined in another ASN.1 module, then the compiler crashes with a fatal error.

Steps and/or TTCN-3 code to reproduce

Imported module:

objid-val OBJECT IDENTIFIER ::= { itu-t(0) recommendation(0) a(1) b(3) }

Importing module:

CharStr ::= CHARACTER STRING ( WITH COMPONENTS { identification ( syntaxes: { abstract objid-val, transfer objid-val } ) } )

What is the current bug behavior?

Compiler crashes with a fatal error

What is the expected correct behavior?

Successful code generation

Relevant logs and/or screenshots

Possible fixes

Implement Ref_defd::generate_code_const_ref()

Titan version

10.0.0

Platform details (OS type and version)

Ubuntu 22.04

/cc @aknappqwt @mmagyari