gdb/testsuite/gdb.base/backtrace-through-cu-nodebug.exp

# Copyright 2010-2025 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 that GDB can generate accurate backtraces even if some of the stack
# trace goes through a function with no debug information.

standard_testfile -caller.c -main.c
set objmainfile [standard_output_file ${testfile}-main.o]
set objcallerfile [standard_output_file ${testfile}-caller.o]

# Recompile the inferior with or without CFI information, then run the
# inferior until the point where the important test starts.
# Returns FALSE on an ERROR.
proc prepare_test {has_cfi} {
    global srcdir subdir srcfile srcfile2 objmainfile objcallerfile binfile
    if {$has_cfi} {
	set extension "cfi"
	if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" \
	     "${objcallerfile}" \
	     object [list {additional_flags=-fomit-frame-pointer \
		 -funwind-tables -fasynchronous-unwind-tables}]] != "" } {
	    untested "couldn't compile"
	    return false
      }
    } else {
	set extension "no-cfi"
	if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" \
	     "${objcallerfile}" \
	     object [list {additional_flags=-fomit-frame-pointer \
		 -fno-unwind-tables \
		 -fno-asynchronous-unwind-tables}]] != "" } {
	    untested "couldn't compile"
	    return false
      }
    }
    if {[gdb_compile [list "${objmainfile}" \
	    "${objcallerfile}"] \
	    "${binfile}-${extension}" binfile {}] != ""} {
	untested "couldn't link object files"
	return false
    }

    clean_restart
    gdb_load $binfile-$extension

    if { ![runto callback] } {
	fail "has_cfi=$has_cfi: Can't run to callback"
	return false
    }
    gdb_test_no_output "maint frame-unwinder disable ARCH"
    return true
}

if {[gdb_compile "${srcdir}/${subdir}/${srcfile2}" \
	"${objmainfile}" \
	object {debug}] != "" } {
    untested "couldn't compile main file"
    return
}

proc_with_prefix no-cfi {} {
    if { ![prepare_test false] } {
	return
    }

    set re_msg \
	[string_list_to_regexp \
	     "Required frame unwinder may have been disabled," \
	     " see 'maint info frame-unwinders'"]
    set hs {[^\r\n]}
    set re_bt_line "#0\\s+[string_to_regexp {callback ()}] $hs+"
    set re_bt_no_filters \
	[multi_line \
	     $re_bt_line \
	     $re_msg]
    gdb_test "bt -no-filters" \
	$re_bt_no_filters \
	"verify no-filters unwind fail"

    # Flush frame cache to retrigger the message.
    gdb_test "maint flush register-cache" \
	[string_to_regexp "Register cache flushed."]

    # This output may occur when we run into the message while applying the
    # frame filters.
    set re_bt \
	[multi_line \
	     $hs+$re_msg \
	     $re_bt_line]
    gdb_test "bt" \
	"($re_bt|$re_bt_no_filters)" \
	"verify unwind fail"
}

proc_with_prefix cfi {} {
    if { ![prepare_test true] } {
	return
    }

    if { [istarget "arm*-*-*"] } {
	setup_kfail backtrace/31950 *-*-*
    }
    set text {[^\r\n]+}
    # #0  callback () at ...
    # #1  0x00000000004004e9 in caller ()
    # #2  0x00000000004004cd in main () at ...
    gdb_test "bt" \
	[multi_line \
	     "#0 +callback $text" \
	     "#1 $text in caller $text" \
	     "#2 $text in main $text"] \
	"Verify unwinding works"
}

no-cfi
cfi