[PATCH] D64811: Warn when NumParams overflows

[John McCall via Phabricator via cfe-commits]

rjmccall added inline comments.


================
Comment at: clang/lib/Parse/ParseDecl.cpp:6673
+  // Avoid exceeding the maximum function parameters
+  // See https://bugs.llvm.org/show_bug.cgi?id=19607
+  if (ParamInfo.size() > Type::getMaxNumParams()) {
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rjmccall wrote:
> We don't usually cite bugs like this in the main source code except as "there's a bug with this, here's where we tracking fixing it".  The comment explains the purpose of the diagnostic well enough (but please include a period).
> 
> Can you just drop the excess arguments here instead of cutting off parsing?
Or actually — let's move this out of the parser entirely, because (unlike prototype scope depth) we actually need to diagnose it in Sema as well because of variadic templates.  `Sema::BuildFunctionType` seems like the right place.

Also, can you `static_assert` that function declarations support at least as many parameter declarations as we allow in types?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D64811/new/

https://reviews.llvm.org/D64811