[Bug libdw/23982] New: dwarf_formref_die() does not support DW_FORM_indirect

Andreas.Kromke at dreamchip dot de sourceware-bugzilla@sourceware.org
Thu Dec 13 17:21:00 GMT 2018


https://sourceware.org/bugzilla/show_bug.cgi?id=23982

            Bug ID: 23982
           Summary: dwarf_formref_die() does not support DW_FORM_indirect
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libdw
          Assignee: unassigned at sourceware dot org
          Reporter: Andreas.Kromke at dreamchip dot de
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

This kind of indirect form is generated by some ARM compilers.

A temporary workaround might be:


Dwarf_Attribute *attr = dwarf_attr_integrate(die, DW_AT_type, &attr_mem);
if (attr != NULL)
{
    unsigned int whatform = dwarf_whatform(attr);
    while(whatform == DW_FORM_indirect)
    {
        uint64_t val;
        const unsigned char *p = (const unsigned char *) attr->valp;
        get_uleb128_unchecked(val, p);
        whatform = (unsigned int) val;
        attr_mem.form = whatform;
        attr_mem.valp = (void *) p;
    }
    Dwarf_Die *type = dwarf_formref_die(attr, type_die);
...


However, this method is rather ugly, because it needs the internal function
get_uleb128_unchecked().

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