forked from Imagelibrary/binutils-gdb
d01e823438
This updates the copyright headers to include 2025. I did this by running gdb/copyright.py and then manually modifying a few files as noted by the script. Approved-By: Eli Zaretskii <eliz@gnu.org>
115 lines
3.9 KiB
Plaintext
115 lines
3.9 KiB
Plaintext
# Copyright 2024-2025 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test how GDB handles a frame in which the previous-pc value is not
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# available. Specifically, check that the backtrace correctly reports
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# why the backtrace is truncated, and ensure that 'display' directives
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# still work when 'stepi'-ing through the frame.
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#
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# We do this by registering a Python unwinder which doesn't provide
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# any previous register values.
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require allow_python_tests
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standard_testfile
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if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
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return
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}
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set remote_python_file \
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[gdb_remote_download host "${srcdir}/${subdir}/${testfile}.py"]
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if { ![runto "break_bt_here"] } {
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return
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}
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# Figuring out the correct frame-id from a Python unwinder is hard.
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# We need to know the function's start address (not too hard), and the
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# stack address on entry to the function, which is much harder to
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# figure out in a cross-target way.
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#
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# So instead we run without any Python unwinder in place and use
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# 'maint print frame-id' to record the frame-id. We then restart GDB,
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# load the Python unwinder, and tell it to use the frame-id we
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# recorded here.
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set pc unknown
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set cfa unknown
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gdb_test_multiple "maintenance print frame-id" "store break_bt_here frame-id" {
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-re -wrap "frame-id for frame #0: \\{stack=($hex),code=($hex),\[^\}\]+\\}" {
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set cfa $expect_out(1,string)
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set pc $expect_out(1,string)
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}
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}
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gdb_assert { ![string equal $cfa unknown] } \
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"check we read the frame's CFA"
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gdb_assert { ![string equal $pc unknown] } \
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"check we read the frame's PC"
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# Restart and load the Python unwinder script.
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clean_restart $binfile
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gdb_test_no_output "source ${remote_python_file}" "load python file"
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# Tell the Python unwinder to use the frame-id we cached above.
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gdb_test_no_output "python set_break_bt_here_frame_id($pc, $cfa)" \
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"call set_break_bt_here_frame_id to set the frame-id"
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# Run up to the function which the unwinder will claim.
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if { ![runto "break_bt_here"] } {
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return
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}
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# Print the backtrace. Check that the reason for stopping the
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# backtrace is that the previous $pc is not available.
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gdb_test "bt" \
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[multi_line \
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"^#0 break_bt_here \\(\\) at \[^\r\n\]+" \
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"Backtrace stopped: frame did not save the PC"] \
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"backtrace from break_bt_here function"
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# Ensure we can stepi.
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gdb_test "stepi" \
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"(:?$hex\\s+)?$decimal\\s+\[^\r\n\]+" \
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"stepi without a display in place"
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# Setup a 'display' directive.
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gdb_test "display/i \$pc" \
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[multi_line \
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"^1: x/i \\\$pc" \
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"=> $hex <break_bt_here(:?\\+$decimal)?>:\\s+\[^\r\n\]+"]
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# Step again, check the 'display' directive is shown.
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gdb_test "stepi" \
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[multi_line \
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"(:?$hex\\s+)?$decimal\\s+\[^\r\n\]+" \
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"1: x/i \\\$pc" \
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"=> $hex <break_bt_here(:?\\+$decimal)?>:\\s+\[^\r\n\]+"] \
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"stepi with a display in place"
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# Continue to a function that is called from within break_bt_here.
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# The Python unwinder will then be claiming frame #1.
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gdb_breakpoint other_func
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gdb_continue_to_breakpoint "continue to other_func"
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# Print the backtrace and check that the reason for stopping the
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# backtrace is that the previous $pc is not available.
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gdb_test "bt" \
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[multi_line \
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"#0 other_func \\(\\) at \[^\r\n\]+" \
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"#1 (:?$hex in )?break_bt_here \\(\\) at \[^\r\n\]+" \
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"Backtrace stopped: frame did not save the PC"] \
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"backtrace from other_func function"
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