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# Copyright 1998, 2007, 2008, 2009, 2010 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 .

load_lib "trace-support.exp"

if $tracelevel then {

        strace $tracelevel

}

set testfile "circ"

set srcfile ${testfile}.c

set binfile $objdir/$subdir/$testfile

if { [gdb_compile "$srcdir/$subdir/$srcfile" $binfile \

        executable {debug nowarnings}] != "" } {

    untested circ.exp

    return -1

}

# Tests:

# 1) Set up a trace experiment that will collect approximately 10 frames,

#    requiring more than 512 but less than 1024 bytes of cache buffer.

#    (most targets should have at least 1024 bytes of cache buffer!)

#    Run and confirm that it collects all 10 frames.

# 2) Artificially limit the trace buffer to 512 bytes, and rerun the

#    experiment.  Confirm that the first several frames are collected,

#    but that the last several are not.

# 3) Set trace buffer to circular mode, still with the artificial limit

#    of 512 bytes, and rerun the experiment.  Confirm that the last

#    several frames are collected, but the first several are not.

#

# return 0 for success, 1 for failure

proc run_trace_experiment { pass } {

    gdb_run_cmd

    if [gdb_test "tstart" \

            "\[\r\n\]*" \

            "start trace experiment, pass $pass"] then { return 1; }

    if [gdb_test "continue" \

            "Continuing.*Breakpoint \[0-9\]+, end.*" \

            "run to end, pass $pass"] then { return 1; }

    if [gdb_test "tstop" \

            "\[\r\n\]*" \

            "stop trace experiment, pass $pass"] then { return 1; }

    return 0;

}

# return 0 for success, 1 for failure

proc set_a_tracepoint { func } {

    if [gdb_test "trace $func" \

            "Tracepoint \[0-9\]+ at .*" \

            "set tracepoint at $func"] then {

        return 1;

    }

    if [gdb_trace_setactions "set actions for $func" \

            "" \

            "collect testload" "^$"] then {

        return 1;

    }

    return 0;

}

# return 0 for success, 1 for failure

proc setup_tracepoints { } {

    gdb_delete_tracepoints

    if [set_a_tracepoint func0] then { return 1; }

    if [set_a_tracepoint func1] then { return 1; }

    if [set_a_tracepoint func2] then { return 1; }

    if [set_a_tracepoint func3] then { return 1; }

    if [set_a_tracepoint func4] then { return 1; }

    if [set_a_tracepoint func5] then { return 1; }

    if [set_a_tracepoint func6] then { return 1; }

    if [set_a_tracepoint func7] then { return 1; }

    if [set_a_tracepoint func8] then { return 1; }

    if [set_a_tracepoint func9] then { return 1; }

    return 0;

}

# return 0 for success, 1 for failure

proc trace_buffer_normal { } {

    if [gdb_test "maint packet QTBuffer:size:ffffffff" \

            "received: .OK." ""] then {

        pass "This test cannot be run on this target"

        return 1;

    }

    if [gdb_test "maint packet QTBuffer:circular:0" \

            "received: .OK." ""] then {

        pass "This test cannot be run on this target"

        return 1;

    }

    return 0;

}

# return 0 for success, 1 for failure

proc gdb_trace_circular_tests { } {

    # We generously give ourselves one "pass" if we successfully

    # detect that this test cannot be run on this target!

    if { ![gdb_target_supports_trace] } then {

        pass "Current target does not support trace"

        return 1;

    }

    if [trace_buffer_normal] then { return 1; }

    gdb_test "break begin" ".*" ""

    gdb_test "break end"   ".*" ""

    gdb_test "tstop"       ".*" ""

    gdb_test "tfind none"  ".*" ""

    if [setup_tracepoints] then { return 1; }

    # First, run the trace experiment with default attributes:

    # Make sure it behaves as expected.

    if [run_trace_experiment 1] then { return 1; }

    if [gdb_test "tfind start" \

            "#0  func0 .*" \

            "find frame zero, pass 1"] then { return 1; }

    if [gdb_test "tfind 9" \

            "#0  func9 .*" \

            "find frame nine, pass 1"] then { return 1; }

    if [gdb_test "tfind none" \

            "#0  end .*" \

            "quit trace debugging, pass 1"] then { return 1; }

    # Then, shrink the trace buffer so that it will not hold

    # all ten trace frames.  Verify that frame zero is still

    # collected, but frame nine is not.

    if [gdb_test "maint packet QTBuffer:size:200" \

            "received: .OK." "shrink the target trace buffer"] then {

        return 1;

    }

    if [run_trace_experiment 2] then { return 1; }

    if [gdb_test "tfind start" \

            "#0  func0 .*" \

            "find frame zero, pass 2"] then { return 1; }

    if [gdb_test "tfind 9" \

            ".* failed to find .*" \

            "fail to find frame nine, pass 2"] then { return 1; }

    if [gdb_test "tfind none" \

            "#0  end .*" \

            "quit trace debugging, pass 2"] then { return 1; }

    # Finally, make the buffer circular.  Now when it runs out of

    # space, it should wrap around and overwrite the earliest frames.

    # This means that:

    #   1) frame zero will be overwritten and therefore unavailable

    #   2) the earliest frame in the buffer will be other-than-zero

    #   3) frame nine will be available (unlike on pass 2).

    if [gdb_test "maint packet QTBuffer:circular:1" \

            "received: .OK." "make the target trace buffer circular"] then {

        return 1;

    }

    if [run_trace_experiment 3] then { return 1; }

    if [gdb_test "tfind start" \

            "#0  func\[1-9\] .*" \

            "first frame is NOT frame zero, pass 3"] then { return 1; }

    if [gdb_test "tfind 9" \

            "#0  func9 .*" \

            "find frame nine, pass 3"] then { return 1; }

    if [gdb_test "tfind none" \

            "#0  end .*" \

            "quit trace debugging, pass 3"] then { return 1; }

    return 0;

}

# Start with a fresh gdb.

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load $binfile

if [target_info exists gdb_stub] {

    gdb_step_for_stub;

}

gdb_test_no_output "set circular-trace-buffer on" \

    "set circular-trace-buffer on"

gdb_test "show circular-trace-buffer" "Target's use of circular trace buffer is on." "show circular-trace-buffer (on)"

gdb_test_no_output "set circular-trace-buffer off" \

    "set circular-trace-buffer off"

gdb_test "show circular-trace-buffer" "Target's use of circular trace buffer is off." "show circular-trace-buffer (off)"

# Body of test encased in a proc so we can return prematurely.

if { ![gdb_trace_circular_tests] } then {

    # Set trace buffer attributes back to normal

    trace_buffer_normal;

}

# Finished!

gdb_test "tfind none" ".*" ""