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# Copyright 2021-2025 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/>.
# Check that the unwinder produces consistent frame info, by making
# sure that "info frame" shows the same result when stopped at a
# function (level == 0), compared to when we find the same frame in
# the stack at a level > 0. Tests both the DWARF stack unwinder, and
# the fallback heuristic unwinder.
standard_testfile backtrace.c
set flags {}
lappend flags debug
lappend_include_file flags $srcdir/lib/attributes.h
if { [build_executable "failed to prepare" $testfile $srcfile $flags] } {
return -1
}
# Unwind to each function in FRAMES, and compare "info frame" output
# to what was saved in the 'info_frame_before' array.
proc compare_frames {frames} {
foreach_with_prefix compare_frame $frames {
if {[gdb_test \
"frame function $compare_frame" \
" $compare_frame .*"] != 0} {
continue
}
set info_frame_after ""
gdb_test_multiple "info frame" "" {
-re "(.*\r\n$::gdb_prompt $)" {
set info_frame_after $expect_out(1,string)
pass $gdb_test_name
}
}
# Nuke the PC address, since it'll be different. The
# first time it's the actual PC before the call, the
# second time it's the resume address after the call
# returns.
# E.g., on x86-64:
# rip = 0x555555555168 in main (gdb.base/backtrace.c:41); saved rip = 0x7ffff7dd90b3
# vs
# rip = 0x555555555172 in main (gdb.base/backtrace.c:41); saved rip = 0x7ffff7dd90b3
#
set from \
"= $::hex in $compare_frame "
set to \
"= \$hex in $compare_frame "
regsub $from $::info_frame_before($compare_frame) $to \
::info_frame_before($compare_frame)
regsub $from $info_frame_after $to \
info_frame_after
# Remove the "caller of frame at" line, which didn't
# appear the first time, since the frame hadn't called any
# other function yet then.
regsub "\r\n caller of frame at $::hex\r\n" \
$info_frame_after "\r\n" \
info_frame_after
regsub ", caller of frame at $::hex" \
$info_frame_after "" \
info_frame_after
# "Stack level 0/1/2/3" -> "Stack level N"
set from \
"Stack level $::decimal"
set to \
"Stack level N"
regsub $from $::info_frame_before($compare_frame) $to \
::info_frame_before($compare_frame)
regsub $from $info_frame_after $to \
info_frame_after
# For debugging.
verbose -log "BEFORE:\n$::info_frame_before($compare_frame)"
verbose -log "AFTER:\n$info_frame_after"
gdb_assert {[string match \
$::info_frame_before($compare_frame)\
$info_frame_after]} \
"info frame before/after match"
}
}
proc test {enable} {
clean_restart $::binfile
gdb_test_no_output "maint frame-unwinder $enable DEBUGINFO"
if {![runto_main]} {
return 0
}
array unset ::info_frame_before
# Run to each function, and record "info frame" output in the
# 'info_frame_before' array. At each stop, unwind to each
# already-recorded function, and compare "info frame" output to
# what was saved in the 'info_frame_before' array.
set funcs {"main" "foo" "bar" "baz"}
set idx_funcs 0
foreach_with_prefix stop_func $funcs {
if {$idx_funcs != 0} {
gdb_breakpoint $stop_func
gdb_continue_to_breakpoint ".*$stop_func \(\).*"
}
set ::info_frame_before($stop_func) ""
gdb_test_multiple "info frame" "" {
-re "(.*\r\n$::gdb_prompt $)" {
set ::info_frame_before($stop_func) $expect_out(1,string)
pass $gdb_test_name
}
}
if {$idx_funcs != 0} {
compare_frames [lreverse [lrange $funcs 0 $idx_funcs-1]]
}
incr idx_funcs
}
}
foreach_with_prefix action {"disable" "enable"} {
test $action
}
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