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3fa23bb5a5
When running test-case gdb.cp/cpexprs-debug-types.exp with target board
cc-with-debug-names, I run into:
...
(gdb) print base::operator new^M
^M
^M
Fatal signal: Segmentation fault^M
----- Backtrace -----^M
0x57ea46 gdb_internal_backtrace_1^M
/home/vries/gdb_versions/devel/src/gdb/bt-utils.c:122^M
0x57eae9 _Z22gdb_internal_backtracev^M
/home/vries/gdb_versions/devel/src/gdb/bt-utils.c:168^M
0x75b8ad handle_fatal_signal^M
/home/vries/gdb_versions/devel/src/gdb/event-top.c:946^M
0x75ba19 handle_sigsegv^M
/home/vries/gdb_versions/devel/src/gdb/event-top.c:1019^M
0x7f795f46a8bf ???^M
0x6d3cb1 _ZNK18dwarf2_per_objfile12symtab_set_pEPK18dwarf2_per_cu_data^M
/home/vries/gdb_versions/devel/src/gdb/dwarf2/read.c:1515^M
...
The problem is in this piece of code in dw2_debug_names_iterator::next:
...
case DW_IDX_type_unit:
/* Don't crash on bad data. */
if (ull >= per_bfd->tu_stats.nr_tus)
{
complaint (_(".debug_names entry has bad TU index %s"
" [in module %s]"),
pulongest (ull),
objfile_name (objfile));
continue;
}
per_cu = per_bfd->get_cu (ull + per_bfd->tu_stats.nr_tus);
break;
...
The all_comp_units vector (which get_cu accesses) contains both CUs and TUs,
with CUs first.
So to get the nth TU we need the element at "nr_cus + n", but
the code uses "nr_tus + n" instead.
Fix this by using "nr_cus + n".
Tested on x86_64-linux.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29334
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