"Import Variables" shows non-existent array contents at index 1 but none at index 0

[amosnier]

Version/Branch:

3650ed7

Operating system:

Xubuntu 24.04.1 LTS

Debug probe:

ST-LINK V3

Microcontroller:

STM32G431RB

Details:

Maybe there is a simpler way to reproduce this, I'm not sure. But I'm hoping it's still fairly easy with the instructions below.

Prerequisites: have ninja, arm-none-eabi-gcc and a fairly new cmake on your path. At least these are the obvious dependencies that come to my mind.

How to reproduce the issue:

git clone ssh://[email protected]/amosnier/mcu_viewer_test_case --depth 1
cd mcu_viewer_test_case
cmake --preset debug
cmake --build build-debug/

And then:

• Open build-debug/st_motor_control_01_eclipse.map. Search for FOCVars. In my case it's at address 0x20000518 with size 0x26. It's an array with a single item that is declared in Src/mc_config.c.
• Open MCUViewer. Under "Acquisition Settings", pick the built elf file: build-debug/Src/st_motor_control_01_eclipse.elf.
• Press "Import variables from *.elf". Search for "FOCVars". Only variables under FOCVars[1] starting at address 0x2000053e, which is is 0x20000518 + 0x26, are showed. That seems like a bug, since FOCVars[1] does not exist (but FOCVars[0] does, at address 0x20000518).

Expected behavior: FOCVars[0] is showed instead of FOCVars[1].

Screenshots/Video:

[amosnier]

I have just realized that the ELF-import function is in beta. I have now tried "Add variable" and "Update variable addresses", and that works fine. I have also not attached the actual ELF-file, but I'm hoping that my instructions more than compensate for that.

[klonyyy]

Hey! Thank you for a solid issue description - yes this is a known issue to me - seems that gdb lists the arrays based on how they're declared, so the number in the brackets is the number of elements. I need to implement a better array handling. For now the best solution is the one that you've found out.