VPI: cannot access constant variables of array type (array, std_logic, signed, ...)

[Scafir]

Description
Using VPI (cocotb 0.2.3) with latest ghdl, trying to access a constant array results in vpi_get: unknown property.

Expected behaviour
The value of the constant array should be accessible and not error should happen.

How to reproduce?

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE ieee.numeric_std.ALL;

ENTITY main IS
    PORT (
        data_out : out  std_logic_vector(15 DOWNTO 0));
END main;

ARCHITECTURE structure OF main IS
    TYPE memT IS ARRAY(0 to 2) OF unsigned(15 DOWNTO 0);
    SIGNAL mem : memT;
    CONSTANT memC : memT := (others => (others => '0'));

BEGIN
    data_out <= std_logic_vector(mem(0));
END structure;

import cocotb
from cocotb.triggers import Timer

@cocotb.test()
async def init_test(dut):
    await Timer(1)

    print("Elements in dut:")
    print(dir(dut))
    print ("")
    print("Memory: ")
    print(dut.mem[0].value)
    # Following line makes GHDL crash
    print(dut.memC[0].value)

VHDL_SOURCES = $(PWD)/main.vhd
TOPLEVEL = main
MODULE = test_main
SIM = ghdl

include $(shell cocotb-config --makefiles)/Makefile.sim

Context
Please, provide the following information:

• OS: Fedora 37
• Origin:
  • Package manager: version
  • Released binaries: tarball_url
  • Built from sources: 65a40a067d1b153265eaf8bcadbc225c5eeac041

Maybe helpful material
Issue #237, closed with c64e7ba

[Scafir]

With further inspection, it seems any array-based variable is impacted by this. On top of my head:

• std_logic_vector
• signed/unsigned
• arrays
• ufixed/sfixed
• ...

I have deleted my previous comment, which was misleading.

[umarcor]

@Scafir you might find the following references interesting:

• Array support in VPI #237
• WIP: Support records in vpi #1249
• Constants in vpi #1297
• WIP: Adding structure to represent a give node/context point in RTI tree. #1299
• WIP: Add some documentation on the RTI structures. #1306