gdb/testsuite/gdb.dwarf2/rnglists-multiple-cus.exp

# 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
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# 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 <http://www.gnu.org/licenses/>.

# 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"
}