288 lines
8.3 KiB
Plaintext
288 lines
8.3 KiB
Plaintext
# Copyright 1998-2020 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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load_lib "trace-support.exp"
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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug nowarnings nopie}]} {
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return -1
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}
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# Tests:
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# 1) Calculate the size taken by one trace frame.
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# 2) Set up a trace experiment that will collect approximately 10 frames,
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# requiring more than 512 but less than 1024 bytes of cache buffer.
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# (most targets should have at least 1024 bytes of cache buffer!)
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# Run and confirm that it collects all 10 frames.
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# 3) Artificially limit the trace buffer to 4x + a bytes. Here x is the size
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# of single trace frame and a is a small constant. Rerun the
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# experiment. Confirm that the frame for the first tracepoint is collected,
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# but frames for the last several tracepoints are not.
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# 4) Set trace buffer to circular mode, with the buffer size as in
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# step 3 above. Rerun the experiment. Confirm that the frame for the last
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# tracepoint is collected but not for the first one.
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#
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# Set a tracepoint on given func. The tracepoint is set at entry
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# address and not 'after prologue' address because we use
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# 'tfind pc func' to find the corresponding trace frame afterwards,
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# and that looks for entry address.
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proc set_a_tracepoint { func } {
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gdb_test "trace \*$func" "Tracepoint \[0-9\]+ at .*" \
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"set tracepoint at $func"
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gdb_trace_setactions "set actions for $func" "" "collect testload" "^$"
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}
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# Sets the tracepoints from func0 to func9 using set_a_tracepoint.
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proc setup_tracepoints { } {
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gdb_delete_tracepoints
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set_a_tracepoint func0
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set_a_tracepoint func1
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set_a_tracepoint func2
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set_a_tracepoint func3
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set_a_tracepoint func4
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set_a_tracepoint func5
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set_a_tracepoint func6
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set_a_tracepoint func7
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set_a_tracepoint func8
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set_a_tracepoint func9
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}
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# Start the trace, run to end and then stop the trace.
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proc run_trace_experiment { } {
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global decimal
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setup_tracepoints
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gdb_breakpoint "end" qualified
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gdb_test "tstart" "\[\r\n\]*" "start trace experiment"
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gdb_test "continue" "Continuing.*Breakpoint \[0-9\]+, end.*" \
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"run to end"
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gdb_test "tstop" "\[\r\n\]*" "stop trace experiment"
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}
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if { ![runto_main] } {
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fail "can't run to main to check for trace support"
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return -1
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}
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if { ![gdb_target_supports_trace] } {
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unsupported "target does not support trace"
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return 1
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}
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set test "set circular-trace-buffer on"
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gdb_test_multiple "set circular-trace-buffer on" $test {
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-re ".*Target does not support this command.*$gdb_prompt $" {
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unsupported "target does not support circular trace buffer"
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return 1
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}
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-re "$gdb_prompt $" {
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pass $test
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}
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}
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set circular_supported -1
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set test "check whether circular buffer is supported"
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gdb_test_multiple "tstatus" $test {
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-re ".*Trace buffer is circular.*$gdb_prompt $" {
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set circular_supported 1
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pass $test
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}
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-re "$gdb_prompt $" {
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pass $test
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}
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}
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if { $circular_supported < 0 } {
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unsupported "target does not support circular trace buffer"
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return 1
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}
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gdb_test "show circular-trace-buffer" \
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"Target's use of circular trace buffer is on." \
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"show circular-trace-buffer (on)"
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# Check if changing the trace buffer size is supported. This step is
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# repeated twice. This helps in case the trace buffer size is 100.
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set test_size 100
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set test "change buffer size to $test_size"
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gdb_test_multiple "set trace-buffer-size $test_size" $test {
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-re ".*Target does not support this command.*$gdb_prompt $" {
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unsupported "target does not support changing trace buffer size"
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return 1
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}
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-re "$gdb_prompt $" {
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pass $test
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}
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}
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set test "check whether setting trace buffer size is supported"
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gdb_test_multiple "tstatus" $test {
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-re ".*Trace buffer has ($decimal) bytes of ($decimal) bytes free.*$gdb_prompt $" {
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set total_size $expect_out(2,string)
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if { $test_size != $total_size } {
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unsupported "target does not support changing trace buffer size"
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return 1
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}
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pass $test
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}
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}
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set test_size 400
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gdb_test_no_output "set trace-buffer-size $test_size" \
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"change buffer size to $test_size"
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gdb_test_multiple "tstatus" $test {
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-re ".*Trace buffer has ($decimal) bytes of ($decimal) bytes free.*$gdb_prompt $" {
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set total_size $expect_out(2,string)
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if { $test_size != $total_size } {
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unsupported "target does not support changing trace buffer size"
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return 1
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}
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pass $test
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}
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}
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gdb_test_no_output "set circular-trace-buffer off" \
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"set circular-trace-buffer off"
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gdb_test "show circular-trace-buffer" \
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"Target's use of circular trace buffer is off." \
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"show circular-trace-buffer (off)"
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set total_size -1
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set free_size -1
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set frame_size -1
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# Determine the size used by a single frame. Set a single tracepoint,
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# run and then check the total and free size using the tstatus command.
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# Then subtracting free from total gives us the size of a frame.
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with_test_prefix "frame size" {
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set_a_tracepoint func0
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gdb_breakpoint "end" qualified
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gdb_test "tstart" "\[\r\n\]*" "start trace"
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gdb_test "continue" "Continuing.*Breakpoint \[0-9\]+, end.*" \
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"run to end"
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gdb_test "tstop" "\[\r\n\]*" "stop trace"
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set test "get buffer size"
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gdb_test_multiple "tstatus" $test {
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-re ".*Trace buffer has ($decimal) bytes of ($decimal) bytes free.*$gdb_prompt $" {
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set free_size $expect_out(1,string)
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set total_size $expect_out(2,string)
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pass $test
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}
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}
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# Check that we get the total_size and free_size.
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if { $total_size < 0 } {
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return 1
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}
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if { $free_size < 0 } {
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return 1
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}
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}
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# Calculate the size of a single frame.
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set frame_size "($total_size - $free_size)"
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with_test_prefix "normal buffer" {
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clean_restart $testfile
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if { ![runto_main] } {
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fail "can't run to main"
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return 1
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}
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run_trace_experiment
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# Check that the first frame is actually at func0.
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gdb_test "tfind start" ".*#0 func0 .*" \
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"first frame is at func0"
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gdb_test "tfind pc func9" \
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".*Found trace frame $decimal, tracepoint $decimal\r\n#0 func9 .*" \
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"find frame for func9"
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}
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# Shrink the trace buffer so that it will not hold
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# all ten trace frames. Verify that the frame for func0 is still
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# collected, but the frame for func9 is not.
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set buffer_size "((4 * $frame_size) + 10)"
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with_test_prefix "small buffer" {
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clean_restart $testfile
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if { ![runto_main] } {
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fail "can't run to main"
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return 1
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}
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gdb_test_no_output "set trace-buffer-size $buffer_size" \
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"shrink the target trace buffer"
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run_trace_experiment
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gdb_test "tfind start" ".*#0 func0 .*" \
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"first frame is at func0"
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gdb_test "tfind pc func9" ".* failed to find .*" \
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"find frame for func9"
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}
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# Finally, make the buffer circular. Now when it runs out of
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# space, it should wrap around and overwrite the earliest frames.
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# This means that:
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# 1) the first frame will be overwritten and therefore unavailable.
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# 2) the earliest frame in the buffer will not be for func0.
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# 3) the frame for func9 will be available (unlike "small buffer" case).
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with_test_prefix "circular buffer" {
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clean_restart $testfile
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if { ![runto_main] } {
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fail "can't run to main"
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return 1
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}
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gdb_test_no_output "set trace-buffer-size $buffer_size" \
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"shrink the target trace buffer"
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gdb_test_no_output "set circular-trace-buffer on" \
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"make the target trace buffer circular"
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run_trace_experiment
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gdb_test "tstatus" \
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".*Buffer contains $decimal trace frames \\(of $decimal created total\\).*Trace buffer is circular.*" \
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"trace buffer is circular"
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# The first frame should not be at func0.
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gdb_test "tfind start" ".*#0 func\[1-9\] .*" \
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"first frame is NOT at func0"
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gdb_test \
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"tfind pc func9" \
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".*Found trace frame $decimal, tracepoint $decimal\r\n#0 func9 .*" \
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"find frame for func9"
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}
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