gdb/testsuite/gdb.python/py-record-btrace.exp

# This testcase is part of GDB, the GNU debugger.
#
# Copyright 2016-2025 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/>.

# Skip this test if btrace is disabled.

require allow_btrace_tests allow_python_tests

load_lib gdb-python.exp

standard_testfile

if [prepare_for_testing "failed to prepare" $testfile $srcfile] { return -1 }

if {![runto_main]} {
    return -1
}

with_test_prefix "no or double record" {
    gdb_test "python print(gdb.current_recording())" "None"

    gdb_test_no_output "python gdb.start_recording(\"btrace\")"
    gdb_test "python gdb.start_recording(\"btrace\")" \
	".*gdb\.error.*: The process is already being recorded\..*" \
	"already recording"

    gdb_test_no_output "python gdb.stop_recording()" "first"
    gdb_test "python gdb.stop_recording()" \
	".*gdb\.error.*: No recording is currently active\..*" "second"
}

with_test_prefix "preopened record btrace" {
    gdb_test_no_output "record btrace"
    gdb_test "python print(gdb.current_recording().method)" "btrace"
    gdb_test "python print(gdb.current_recording().format)" "pt|bts"
    gdb_test_no_output "python gdb.stop_recording()"
}

with_test_prefix "prepare record" {
    gdb_test_no_output "python r = gdb.start_recording(\"btrace\")"
    gdb_test "python print(r.method)" "btrace"
    gdb_test "python print(r.format)" "pt|bts"
    gdb_test "stepi 100" ".*"

    # There's a HW bug affecting Processor Trace on some Intel processors.
    # The bug was exposed by linux kernel commit 670638477aed
    # ("perf/x86/intel/pt: Opportunistically use single range output mode"),
    # added in version v5.5.0, and was worked around by commit ce0d998be927
    # ("perf/x86/intel/pt: Fix sampling using single range output") in version
    # 6.1.0.  Detect the kernel version range for which the problem may
    # manifest.
    set have_xfail 0
    set v [linux_kernel_version]
    if { $v != {} } {
	set have_xfail \
	    [expr [version_compare [list 5 5 0] <= $v] \
		 && [version_compare $v < [list 6 1 0]]]
    }
    set nonl_re \[^\r\n\]
    set xfail_re \
	[join \
	     [list \
		  "warning: Decode error \\($nonl_re*\\) at instruction $decimal" \
		  "\\(offset = $hex, pc = $hex\\):" \
		  "$nonl_re*\\."]]
    set xfail_re_2 \
	[join \
	     [list \
		  "warning: Non-contiguous trace at instruction $decimal" \
		  "\\(offset = $hex\\)\\."]]

    set got_xfail 0
    set cmd "python insn = r.instruction_history"
    gdb_test_multiple $cmd "" {
	-re "^[string_to_regexp $cmd]\r\n$::gdb_prompt $" {
	    pass $gdb_test_name
	}
	-re -wrap "($xfail_re|$xfail_re_2)" {
	    if { $have_xfail } {
		xfail $gdb_test_name
		set got_xfail 1
	    } else {
		fail $gdb_test_name
	    }
	}
    }
    if { $got_xfail } {
	return
    }

    # Also handle the case that we're running into the hw bug without
    # triggering a decode error.
    gdb_test_multiple "python print(len(insn))" "" {
	-re -wrap "100" {
	    pass $gdb_test_name
	}
	-re -wrap "" {
	    if { $have_xfail } {
		xfail $gdb_test_name
		set got_xfail 1
	    } else {
		fail $gdb_test_name
	    }
	}
    }
    if { $got_xfail } {
	return
    }

    gdb_test_no_output "python call = r.function_call_history"
    gdb_test_no_output "python i = insn\[0\]"
    gdb_test_no_output "python c = call\[0\]"
}

with_test_prefix "replay begin" {
    gdb_test "python print(r.replay_position)" "None"
    gdb_test "python r.goto(r.begin)"
    gdb_test "python print(r.replay_position.number)" "1"
}

with_test_prefix "replay end" {
    gdb_test "python r.goto(r.end)"
    gdb_test "python print(r.replay_position)" "None"
}

with_test_prefix "instruction " {
    gdb_test "python print(i.number)" "1"
    gdb_test "python print(i.sal)" "symbol and line for .*"
    gdb_test "python print(i.pc)" "$decimal"
    gdb_test "python print(repr(i.data))" "<memory at $hex>"
    gdb_test "python print(i.decoded)" ".*"
    gdb_test "python print(i.size)" "$decimal"
    gdb_test "python print(i.is_speculative)" "False"
}

with_test_prefix "function call" {
    gdb_test "python print(c.number)" "1"
    gdb_test "python print(c.symbol)" "main"
    gdb_test "python print(c.level)" "$decimal"
    gdb_test "python print(len(c.instructions))" "$decimal"
    gdb_test "python print(c.up)" "None"
    gdb_test "python print(c.prev)" "None"
    gdb_test "python print(c == c.next.prev)" "True"
}

with_test_prefix "list" {
    gdb_test "python print(len(insn\[23:65\]))" "42"
    gdb_test "python print(insn\[17:\]\[2\].number)" "20"
    gdb_test "python print(i in insn)" "True"
    gdb_test "python print(i in call)" "False"
    gdb_test "python print(c in insn)" "False"
    gdb_test "python print(c in call)" "True"
    gdb_test "python print(insn.index(i))" "0"
    gdb_test "python print(insn.count(i))" "1"
}

with_test_prefix "sublist" {
    gdb_test_no_output "python s1 = insn\[3:72:5\]"
    gdb_test_no_output "python s2 = s1\[2:13:3\]"
    gdb_test_no_output "python s3 = s1\[13:2:-3\]"
    gdb_test_no_output "python s4 = insn\[::-1\]"

    gdb_test "python print(\[i.number for i in s1\])" "\\\[4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69\\\]"
    gdb_test "python print(\[i.number for i in s2\])" "\\\[14, 29, 44, 59\\\]"
    gdb_test "python print(\[i.number for i in s3\])" "\\\[69, 54, 39, 24\\\]"

    gdb_test "python print(len(s1))" "14"
    gdb_test "python print(len(s2))" "4"
    gdb_test "python print(len(s3))" "4"
    gdb_test "python print(len(s4))" "100"

    gdb_test "python print(s4\[5\].number)" "95"
    gdb_test "python print(s4\[-5\].number)" "5"
    gdb_test "python print(s4\[100\].number)" ".*IndexError.*"
    gdb_test "python print(s4\[-101\].number)" ".*IndexError.*"
}

with_test_prefix "level" {
    gdb_test_no_output "python gdb.stop_recording()"
    gdb_test "break inner" "Breakpoint.*"
    gdb_test "continue" "Continuing\..*"
    gdb_test_no_output "record btrace"
    gdb_test "step" "outer ().*" "step one"
    gdb_test "step" "main ().*" "step two"
    gdb_test "python print(gdb.current_recording().function_call_history\[0\].level)" "1"
    gdb_test "python print(gdb.current_recording().function_call_history\[1\].level)" "0"
}

# Note:  GDB can incrementally add to the recording from the raw trace data.
# After a clear(), GDB might not have all the raw trace data available in its
# buffer to recreate the full recording it had before the clear().
# So, do this testing last to avoid disturbing subsequent tests.
with_test_prefix "clear" {
    gdb_test_no_output "python r.clear()"
    gdb_test "python insn = r.instruction_history"
    gdb_test_no_output "python i = insn\[0\]"
    gdb_test "python print(i.size)" "$decimal"
}