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# Copyright 2020 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
# Test to reproduce the crash described in PR 26813.
# When reading a list in any table in the .debug_rnglists section, GDB would
# read the header at offset 0 in the section (the header of the first table).
# When the index of the list we read was greater than the number of lists of
# the first table, GDB would erroneously report that the index is invalid.
# So this test creates a .debug_rnglists section with two tables. The second
# table has more lists than the first one and we try to read a high index in
# the second table.
load_lib dwarf.exp
if {![dwarf2_support]} {
return 0
# Test with 32-bit and 64-bit DWARF.
foreach_with_prefix is_64 {false true} {
if { $is_64 } {
standard_testfile main.c -dw64.S
set testfile ${testfile}-dw64
} else {
standard_testfile main.c -dw32.S
set testfile ${testfile}-dw32
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
global is_64
# The CU uses the DW_FORM_rnglistx form to refer to the .debug_rnglists
# section.
cu {
version 5
is_64 $is_64
} {
DW_TAG_compile_unit {
{DW_AT_ranges 1 DW_FORM_rnglistx}
{DW_AT_rnglists_base cu_table DW_FORM_sec_offset}
} {
# This tests a DW_AT_ranges attribute of form DW_FORM_rnglistx on a
# function, which was buggy at some point.
DW_TAG_subprogram {
{DW_AT_name "foo"}
{DW_AT_ranges 2 DW_FORM_rnglistx}
rnglists {is-64 $is_64} {
# This table is unused, but exists so that the used table is not at
# the beginning of the section.
table {} {
list_ {
start_end 0x1000 0x2000
# The lists in this table are accessed by index (DW_FORM_rnglistx).
table {post-header-label cu_table} {
# This list is unused, but exists to offset the next ones.
list_ {
start_end 0x2000 0x3000
# For the CU.
list_ {
start_end 0x3000 0x4000
# For function foo.
list_ {
start_end 0x3000 0x3010
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
# Sanity checks to make sure GDB slurped the symbols correctly.
gdb_test "p/x &foo" " = 0x3000"