[LLVMdev] debug metadata incomplete for array arguments to functions?

Eli Bendersky eliben at gmail.com
Thu Jul 14 21:35:16 PDT 2011

> > This reflects the compiler's view of things correctly, but is problematic
> for a debugger. The debugger should know that arg_arr refers to a 42-element
> array and isn't just a pointer into a buffer of unspecified length. This is
> something the user would expect.
> > On the other hand, the debugger should also get the information that
> arg_arr is actually a pointer, to be able to get to its values correctly.
> >
> > Is there a way out?
> The only way out is to figure out how to distinguish between these two in
> front-end AST nodes while emitting LLVM IR. The part of front end that emits
> debug info for an argument is seeing arg_arr as a pointer to int.
> If you manually patch metadata in llvm IR then you'll get debug info as you
> expect.
> -

Suppose one would start writing a patch to Clang to rectify this, how would
this information be encoded in the debug metadata, given the dual nature of
the arg_arr argument? Is there a mechanism to support it, or is an extension

Thanks in advance
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