[flang-commits] [PATCH] D109813: [flang] GET_COMMAND_ARGUMENT(VALUE) runtime implementation

[Diana Picus via Phabricator via flang-commits]

rovka added inline comments.


================
Comment at: flang/runtime/command.cpp:60
+  if (n < 0 || n >= executionEnvironment.argc) {
+    if (IsValidCharDescriptor(value)) {
+      FillWithSpaces(value);
----------------
klausler wrote:
> rovka wrote:
> > We're silently ignoring 'value' if it's not allocated or not the right type - should we have an assert instead if it doesn't look the way we expect?
> The `value` argument should be a reference, not a pointer, to a descriptor here (and in your IsValidCharDescriptor() utility above).  It is not optional if ArgumentValue() is actually being called.
Actually I was thinking it is optional. For instance a call to GET_COMMAND_ARGUMENT(NUMBER, LENGTH, STATUS, ERRMSG) would be lowered to a call to ArgumentLength() and one to ArgumentValue() without a descriptor for value, and the latter would just fill in the STATUS and ERRMSG. I guess lowering could skip the call to ArgumentValue and fill in STATUS and ERRMSG based on the return from ArgumentLength, but wouldn't that just be more complicated than necessary?


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  https://reviews.llvm.org/D109813/new/

https://reviews.llvm.org/D109813