Re: C++ demangling of 64-bit symbols on ppc64

[Ian Lance Taylor <iant at google dot com>]

Maynard Johnson <maynardj@us.ibm.com> writes:

> 6513     93.7392  test                     ._Z4doitPc

So the problem is the leading dot (which was probably clear to you but
not to me).  Historically the demangler has not handled leading dots.
Instead, historically, the caller has removed them when appropriate.

The linker, rather than do anything clever, simply removes all leading
dots.  See the demangle() function in ld/ldmisc.c.

  /* This is a hack for better error reporting on XCOFF, PowerPC64-ELF
     or the MS PE format.  These formats have a number of leading '.'s
     on at least some symbols, so we remove all dots to avoid
     confusing the demangler.  */
  p = name;
  while (*p == '.')
    ++p;

It seems to me that opreport should do the same.

Or, we could change the interface to the demangler.  I don't think it
would be appropriate for the demangler to unconditionally remove
leading dots, but I think it would be reasonable to add a DMGL_XX flag
for it if that seems like a better approach.

Ian