Hey there 🤗, Welcome to my GSoC Journey

This is a series of blogs that I am writing to share my amazing GSoC 22 (Google Summer of Code 2022) Journey with you all.

Initial Support for Arrays

This week, I worked towards supporting Arrays in the WebAssembly Backend. The WebAssembly Backend now supports 1D Integer, Real and Logical Arrays.

One of the challenges this week was the unexpected the call stack being observed. For example, for the following statment:

x = [ 5, 7, 6, 8 ]

The visitor functions that are expected to be called are visit_Assignment() followed by visit_Var() and visit_ArrayConstant(). In practice, the visitor function call stack that was being experienced was visit_Assignment() followed by visit_ArrayItem() and visit_IntegerConstant(). This experienced call stack was completely out-of-sync with the expected call stack. After some debugging attempts with no success, I reached out to mentors about the issue.

Fortunately, one of the mentors (@Gangandeep) understood the anomaly straightaway and shared that there is a pass_replace_implied_do_loops() which was transforming the statment

x = [ 5, 7, 6, 8 ]

into a DoLoop as follows:

do i = 1, 4
    x[i] = value_from_the_constant_list
end do

and that is why, the calls to visit_ArrayItem() and visit_IntegerConstant(). Thank you so much @Gangandeep for helping me. I think without you this issue would have taken a lot more time.

This phase was mostly/approximately from 23-07-2022 to 29-07-2022.

The MRs during this phase are as follows:

That’s all for this blog. Thank you for your time. We continue this series in the next blog.