PR9959: improve tracepoint arg type-naming

dwarf_type_name now works with more argument types.  There were
three cases that I needed to improve:

- For "const struct foo*", the debuginfo has a const-DIE named "foo"
  chained to a struct-DIE named "foo", so we can't assume that seeing a
  name means we're down to the base type.  The recursion now decends
  until it explicitly sees a base_type, typedef, struct, or union.

- For "void*", the debuginfo has a pointer-DIE without any DW_AT_type
  after.  Now I'm just catching that failed lookup and writing in
  "void".

- For "va_list", the debuginfo actually resolves to an internal type
  "struct __va_list_tag*", but that struct has no declaration at the
  source level.  I'm just hacking that exact case to say "va_list"
  instead, but it would be nice to find something cleaner...

We'll probably still have problems if any tracepoint uses a function-
pointer argument, but so far I've only seen that as a "void*", which we
now handle ok.

0 files changed, 0 insertions, 0 deletions