[flang-commits] [flang] [flang] Correctly prepare allocatable runtime call arguments (PR #138727)

Tue May 6 10:37:11 PDT 2025

https://github.com/ashermancinelli created https://github.com/llvm/llvm-project/pull/138727

When lowering allocatables, the generated calls to runtime functions were not using the runtime::createArguments utility which handles the required conversions. createArguments is where I added the implicit volatile casts to handle converting volatile variables to the appropriate type based on their volatility in the callee. Because the calls to allocatable runtime functions were not using this function, their arguments were not casted to have the appropriate volatility.

Add a test to demonstrate that volatile and allocatable class/box/reference types are appropriately casted before calling into the runtime library.

Instead of using a recursive variadic template to perform the conversions in createArguments, map over the arguments directly so that createArguments can be called with an ArrayRef of arguments. Some cases in Allocatable.cpp already had a vector of values at the point where createArguments needed to be called - the new overload allows calling with a vector of args or the variadic version with each argument spelled out at the callsite.

This change resulted in the allocatable runtime calls having their arguments converted left-to-right, which changed some of the test results. I used CHECK-DAG to ignore the order.

Add some missing handling of volatile class entities, which I previously missed because I had not yet enabled volatile class entities in Lower.

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