OpenCV matrix inside std::vector is not displayed in LLDB

[wl2776]

Environment

• OID version (commit or tag): head of main branch (b151cd9)
• OS and Version: MacOS Sonoma 14.2.1, Ubuntu 22.04
• Debugger and versions:
  lldb: 17.0.6 on MacOS, 14.0.0 on Ubuntu.
• Python version: 3.11.7 on MacOS, 3.10.12 on Ubuntu

Describe the bug

OpenCV matrices, stored in STL containers like std::vector or std::map, are not displayed.

To Reproduce

Same setup as in #215. Compile sample project, run it in LLDB and try to inspect variables, storing OpenCV matrices.

1. Clone and build sample project

   git clone https://github.com/wl2776/oid_debug_sample
   cd oid_debug_sample
   conan install . -b missing -s \&:build_type=Debug -s build_type=Release -of build
   cd build
   cmake .. --preset conan-debug
   make -j
   

2. lldb sample
3. breakpoint set -l 18 -s sample.cpp
4. run
5. When debugger stops on the breakpoint, switch to OID window and try to display mh.v[0]

Expected behavior

Matrix is shown

Actual behavior

Matrix is not displayed

Error messages/stack traces

None.

Additional context

I've added call to print inside the method Mat.is_symbol_observable (file resources/oidscripts/oidtypes/opencv.py)

It shows that type of variable mh.v[0] is std::__1::vector<cv::Mat, std::__1::allocator<cv::Mat> >::value_type.

Currently this method tries to match this type with regex, requiring that type name ends with cv::Mat.

[wl2776]

I've tried to fix this issue by playing with GetType, GetCanonicalType, etc, but currently no luck.
Although I've managed to get it working with std::vector, my solution doesn't work with other STL containers (maps, lists).

I think, it is better to check if a symbol includes required data members (flags, data, datastart, dataend, ... ) and by checking value of flags (I remember that it should contain a kind of magic signatures that we can use to make sure that we have OpenCV matrix).

[brunoalr]

Thanks once more! :D I will also try to take a look at it when I have time. Or maybe ping @csantosbh...

[wl2776]

value of flags (I remember that it should contain a kind of magic signatures that we can use to make sure that we have OpenCV matrix).

Indeed. https://docs.opencv.org/4.x/d3/d63/classcv_1_1Mat.html#af9333f06c84f115fda4cdf3af18c2ad0

enum  	{
  MAGIC_VAL = 0x42FF0000,
  AUTO_STEP  = 0,
  CONTINUOUS_FLAG  = CV_MAT_CONT_FLAG,
  SUBMATRIX_FLAG = CV_SUBMAT_FLAG
}
 
enum  	{
  MAGIC_MASK = 0xFFFF0000,
  TYPE_MASK = 0x00000FFF,
  DEPTH_MASK = 7
}