path: root/gdb/testsuite/gdb.trace/unavailable.exp

# Copyright 1998-2013 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/>.

load_lib "trace-support.exp"

standard_testfile unavailable.cc
set executable $testfile

if {[prepare_for_testing $testfile.exp $testfile $srcfile \
	 {debug nowarnings c++}]} {
    return -1
}

set ws "\[\r\n\t \]+"
set cr "\[\r\n\]+"

if [is_amd64_regs_target] {
    set fpreg "rbp"
    set spreg "rsp"
    set pcreg "rip"
} elseif [is_x86_like_target] {
    set fpreg "ebp"
    set spreg "esp"
    set pcreg "eip"
} else {
    set fpreg "fp"
    set spreg "sp"
    set pcreg "pc"
}

#
# Utility procs
#

proc test_register { reg } {
    global gdb_prompt
    global hex
    global cr

    gdb_test_multiple "print /x $reg" "collected $reg" {
	-re "\\$\[0-9\]+ = \[x0\]+$cr$gdb_prompt $" {
	    fail "collected $reg (zero)"
	}
	-re "\\$\[0-9\]+ = $hex$cr$gdb_prompt $" {
	    pass "collected $reg"
	}
	-re "\[Ee\]rror.*$gdb_prompt $" {
	    fail "collected $reg (error)"
	}
    }
}

proc test_register_unavailable { reg } {
    gdb_test "print /x $reg" \
	"<unavailable>" \
	"correctly report $reg as unavailable"
}

proc prepare_for_trace_test {} {
    global executable

    clean_restart $executable

    runto_main

    gdb_test "break begin" ".*" ""
    gdb_test "break end" ".*" ""
}

proc run_trace_experiment { test_func } {
    global gdb_prompt

    gdb_test "continue" \
	".*Breakpoint \[0-9\]+, begin .*" \
	"advance to begin"

    gdb_test_no_output "tstart" "start trace experiment"

    gdb_test "continue" \
	    "Continuing.*Breakpoint \[0-9\]+, end.*" \
	    "run trace experiment"
    gdb_test "tstop" \
	    "\[\r\n\]+" \
	    "stop trace experiment"
    gdb_test "tfind start" \
	    "#0  $test_func .*" \
	    "tfind test frame"
}

# Test that "display VAR" works as expected, assuming VAR is wholly
# unavailable.

proc test_maybe_regvar_display { var } {
    global gdb_prompt

    # Evaluating VAR's location description may throw an internal
    # "unavailable" exception, if for example, the value of a register
    # necessary for computing VAR's location is unavailable.  Such an
    # exception is caught, and should not cause automatic disablement
    # of the current display being printed.  (GDB used to disable the
    # current display whenever any exception was thrown.)
    set test "display $var"
    gdb_test_multiple "$test" "$test" {
	-re "Disabling display ? to avoid infinite recursion.*$gdb_prompt $" {
	    fail "$test"
	}
	-re "display ${var}\r\n1: ${var} = <unavailable>\r\n$gdb_prompt $" {
	    pass "$test"
	}
    }
    gdb_test "info display" ".*1:\[ \t\]+y\[ \t\]+${var}" "display ${var} is enabled"

    gdb_test "undisp" \
	"" \
	"delete $var display" \
	".*Delete all auto-display expressions.*y or n. $" \
	"y"
}

#
# Test procs
#

proc gdb_collect_args_test {} {
    with_test_prefix "unavailable arguments" {
	global cr
	global gdb_prompt

	prepare_for_trace_test

	gdb_test "trace args_test_func" \
	    "Tracepoint \[0-9\]+ at .*" \
	    "set tracepoint"

	# Begin the test.
	run_trace_experiment args_test_func

	# Test printing the variables, and also their addresses.  We
	# haven't collected any stack, so there's no way GDB can figure
	# out the latter.

	gdb_test "print argc" " = <unavailable>"
	gdb_test "print &argc" \
	    "Can't take address of \"argc\" which isn't an lvalue\."

	gdb_test "print argi" " = <unavailable>"
	gdb_test "print &argi" \
	    "Can't take address of \"argi\" which isn't an lvalue\."

	gdb_test "print argf" " = <unavailable>"
	gdb_test "print &argf" \
	    "Can't take address of \"argf\" which isn't an lvalue\."

	gdb_test "print argd" " = <unavailable>"
	gdb_test "print &argd" \
	    "Can't take address of \"argd\" which isn't an lvalue\."

	# struct arg as one of several args (near end of list)

	gdb_test "print argstruct" " = <unavailable>"

	gdb_test "print argstruct.memberc" " = <unavailable>"
	gdb_test "print argstruct.memberi" " = <unavailable>"
	gdb_test "print argstruct.memberf" " = <unavailable>"
	gdb_test "print argstruct.memberd" " = <unavailable>"

	gdb_test "print argarray" " = <unavailable>"

	gdb_test "print &argarray" \
	    "Can't take address of \"argarray\" which isn't an lvalue\."

	gdb_test "print argarray\[0\]" "value is not available"

	# Test "info args"
	set r ""
	set r "${r}argc = <unavailable>${cr}"
	set r "${r}argi = <unavailable>${cr}"
	set r "${r}argf = <unavailable>${cr}"
	set r "${r}argd = <unavailable>${cr}"
	set r "${r}argstruct = <unavailable>${cr}"
	set r "${r}argarray = <unavailable>${cr}"
	gdb_test "info args" "$r" "info args"

	test_maybe_regvar_display "argc"

	gdb_test "tfind none" \
	    "#0  end .*" \
	    "cease trace debugging"
    }
}

proc gdb_collect_locals_test { func msg } {
    with_test_prefix "unavailable locals: $msg" {
	global cr
	global gdb_prompt

	prepare_for_trace_test

	set testline [gdb_get_line_number "set $func tracepoint here"]

	gdb_test "trace $testline" \
	    "Tracepoint \[0-9\]+ at .*" \
	    "set tracepoint"

	# Begin the test.
	run_trace_experiment $func

	gdb_test "print locc" " = <unavailable>"
	gdb_test "print loci" " = <unavailable>"
	gdb_test "print locf" " = <unavailable>"
	gdb_test "print locd" " = <unavailable>"

	gdb_test "print locst.memberc" " = <unavailable>"
	gdb_test "print locst.memberi" " = <unavailable>"
	gdb_test "print locst.memberf" " = <unavailable>"
	gdb_test "print locst.memberd" " = <unavailable>"

	gdb_test "print locar\[0\]" " = <unavailable>"
	gdb_test "print locar\[1\]" " = <unavailable>"
	gdb_test "print locar\[2\]" " = <unavailable>"
	gdb_test "print locar\[3\]" " = <unavailable>"

	# Test "info locals"
	set r ""
	set r "${r}locf = <unavailable>${cr}"
	set r "${r}locd = <unavailable>${cr}"
	set r "${r}locst = <unavailable>${cr}"
	set r "${r}locar = <unavailable>${cr}"
	set r "${r}i = <unavailable>${cr}"
	if { $func == "local_test_func" } {
	    set r "${r}locdefst = <unavailable>${cr}"
	}
	set r "${r}locc = <unavailable>${cr}"
	set r "${r}loci = <unavailable>${cr}"
	gdb_test "info locals" "$r" "info locals"

	test_maybe_regvar_display "loci"

	gdb_test "tfind none" \
	    "#0  end .*" \
	    "cease trace debugging"
    }
}

proc gdb_unavailable_registers_test { } {
    with_test_prefix "unavailable registers" {
	global gdb_prompt
	global spreg
	global pcreg

	prepare_for_trace_test

	# We'll simply re-use the globals_test_function for this test
	gdb_test "trace globals_test_func" \
	    "Tracepoint \[0-9\]+ at .*" \
	    "set tracepoint"

	# Collect nothing.

	# Begin the test.
	run_trace_experiment globals_test_func

	# On some archs, the $sp/$pc are a real raw registers.  On others,
	# like x86, they're user registers.  Test both variants.
	test_register_unavailable "\$$spreg"
	test_register_unavailable "\$sp"

	# Test reading uncollected pseudo-registers.  The set of which
	# depends on target.
	if [is_amd64_regs_target] {
	    # Check the raw register first.
	    test_register_unavailable "\$rax"
	    test_register_unavailable "\$eax"
	    test_register_unavailable "\$ax"
	} elseif [is_x86_like_target] {
	    # Check the raw register first.
	    test_register_unavailable "\$eax"
	    test_register_unavailable "\$ax"
	}

	# GDBserver always provides the PC value of regular tracepoint
	# hits, since it's the same as the tracepoint's address.
	test_register "\$$pcreg"
	test_register "\$pc"

	gdb_test "info registers" \
	    "<unavailable>.*<unavailable>" \
	    "info registers, multiple registers not available"

	gdb_test "info registers \$$spreg" \
	    "<unavailable>" \
	    "info registers \$$spreg reports not available"

	gdb_test "tfind none" "#0  end .*" "cease trace debugging"
    }
}

proc gdb_unavailable_floats { } {
    global gdb_prompt

    with_test_prefix "unavailable floats" {
	prepare_for_trace_test

	# We'll simply re-use the globals_test_function for this test
	gdb_test "trace globals_test_func" \
	    "Tracepoint \[0-9\]+ at .*" \
	    "set tracepoint"

	# Collect nothing.

	# Begin the test.
	run_trace_experiment globals_test_func

	# Necessarily target specific.
	if {[istarget "x86_64-*-*"] || [istarget i?86-*]} {
	    send_gdb "info float\n"
	    gdb_expect_list "info float" ".*$gdb_prompt $" {
		"Status Word:         <unavailable>"
		"Control Word:        <unavailable>"
		"Tag Word:            <unavailable>"
		"Instruction Pointer: <unavailable>:<unavailable>"
		"Operand Pointer:     <unavailable>:<unavailable>"
		"Opcode:              <unavailable>"
	    }
	}

	gdb_test "tfind none" "#0  end .*" "cease trace debugging"
    }
}

proc gdb_collect_globals_test { } {
    with_test_prefix "collect globals" {
	global ws
	global cr
	global gdb_prompt
	global hex

	prepare_for_trace_test

	set testline [gdb_get_line_number "set globals_test_func tracepoint here"]

	gdb_test "trace $testline" \
	    "Tracepoint \[0-9\]+ at .*" \
	    "set tracepoint"

	# We collect the initial sizeof(pointer) bytes of derived_partial
	# in an attempt of collecting the vptr.  Not portable, but should
	# work everywhere we need to care.
	gdb_trace_setactions "define actions" \
	    "" \
	    "collect struct_b.struct_a.array\[2\]" "^$" \
	    "collect struct_b.struct_a.array\[100\]" "^$" \
	    \
	    "collect a" "^$" \
	    "collect c" "^$" \
	    \
	    "collect tarray\[0\].a" "^$" \
	    "collect tarray\[1\].a" "^$" \
	    "collect tarray\[3\].a" "^$" \
	    "collect tarray\[3\].b" "^$" \
	    "collect tarray\[4\].b" "^$" \
	    "collect tarray\[5\].b" "^$" \
	    \
	    "collect g_string_p" "^$" \
	    "collect g_string_partial\[1\]" "^$" \
	    "collect g_string_partial\[2\]" "^$" \
	    \
	    "collect g_structref_p" "^$" \
	    \
	    "collect *((char *)&derived_partial)@sizeof\(void *\)" "^$" \
	    "collect derived_whole" "^$" \
	    \
	    "collect virtual_partial.z" "^$"

	# Begin the test.
	run_trace_experiment globals_test_func

	gdb_test "print globalc" " = <unavailable>"
	gdb_test "print globali" " = <unavailable>"
	gdb_test "print globalf" " = <unavailable>"
	gdb_test "print globald" " = <unavailable>"

	gdb_test "print globalstruct.memberc" " = <unavailable>"
	gdb_test "print globalstruct.memberi" " = <unavailable>"
	gdb_test "print globalstruct.memberf" " = <unavailable>"
	gdb_test "print globalstruct.memberd" " = <unavailable>"

	gdb_test "print globalstruct" " = <unavailable>"

	gdb_test "print globalp == &globalstruct" \
	    "value is not available" \
	    "can't compare using non collected global pointer"

	gdb_test "print globalarr\[1\]" " = <unavailable>"
	gdb_test "print globalarr\[2\]" " = <unavailable>"
	gdb_test "print globalarr\[3\]" " = <unavailable>"

	gdb_test "print struct_b" \
	    " = {d = <unavailable>, ef = <unavailable>, struct_a = {a = <unavailable>, b = <unavailable>, array = {<unavailable>, <unavailable>, -1431655766, <unavailable> <repeats 97 times>, -1431655766, <unavailable> <repeats 9899 times>}, ptr = <unavailable>, bitfield = <unavailable>}, s = <unavailable>, static static_struct_a = {a = <unavailable>, b = <unavailable>, array = {<unavailable> <repeats 10000 times>}, ptr = <unavailable>, bitfield = <unavailable>}, string = <unavailable>}"

	gdb_test "print /x struct_b" \
	    " = {d = <unavailable>, ef = <unavailable>, struct_a = {a = <unavailable>, b = <unavailable>, array = {<unavailable>, <unavailable>, 0xaaaaaaaa, <unavailable> <repeats 97 times>, 0xaaaaaaaa, <unavailable> <repeats 9899 times>}, ptr = <unavailable>, bitfield = <unavailable>}, s = <unavailable>, static static_struct_a = {a = <unavailable>, b = <unavailable>, array = {<unavailable> <repeats 10000 times>}, ptr = <unavailable>, bitfield = <unavailable>}, string = <unavailable>}"

	gdb_test "print /x struct_b.struct_a" \
	    " = {a = <unavailable>, b = <unavailable>, array = {<unavailable>, <unavailable>, 0xaaaaaaaa, <unavailable> <repeats 97 times>, 0xaaaaaaaa, <unavailable> <repeats 9899 times>}, ptr = <unavailable>, bitfield = <unavailable>}"

	gdb_test "print /x struct_b.struct_a.array" \
	    " = {<unavailable>, <unavailable>, 0xaaaaaaaa, <unavailable> <repeats 97 times>, 0xaaaaaaaa, <unavailable> <repeats 9899 times>}"

	gdb_test "print /x struct_b.struct_a.array\[0\]" " = <unavailable>"

	gdb_test "print /x struct_b.struct_a.array\[2\]" " = 0xaaaaaaaa"

	# Check the target doesn't overcollect.  GDB used to merge memory
	# ranges to collect if they were close enough (collecting the hole
	# as well), but does not do that anymore.  It's plausible that a
	# target may do this on its end, but as of this writing, no known
	# target does it.
	gdb_test "print {a, b, c}" \
	    " = \\{1, <unavailable>, 3\\}" \
	    "No overcollect of almost but not quite adjacent memory ranges"

	# Check <unavailable> isn't confused with 0 in array element repetitions

	gdb_test_no_output "set print repeat 1"

	gdb_test "print /x tarray" \
	    " = \{\{a = 0x0, b = <unavailable>\} <repeats 2 times>, \{a = <unavailable>, b = <unavailable>\}, \{a = 0x0, b = 0x0\}, \{a = <unavailable>, b = 0x0\} <repeats 2 times>, \{a = <unavailable>, b = <unavailable>\} <repeats 2 times>\}" \
	    "<unavailable> is not the same as 0 in array element repetitions"

	gdb_test_no_output "set print repeat 10"

	# Check that value repeat handles unavailable-ness.
	gdb_test "print *tarray@3" " = \\{\\{a = 0, b = <unavailable>\\}, \\{a = 0, b = <unavailable>\\}, \\{a = <unavailable>, b = <unavailable>\\}\\}"

	# Static fields

	gdb_test "print struct_b.static_struct_a" " = <unavailable>"

	# Bitfields

	gdb_test "print struct_b.struct_a.bitfield" " = <unavailable>"

	# References

	gdb_test "print g_int" " = <unavailable>"

	gdb_test "print g_ref" \
	    "\\(int &\\) @$hex: <unavailable>" \
	    "global reference shows address but not value"

	gdb_test "print *&g_ref" \
	    "\\$\[0-9\]+ = <unavailable>$cr" \
	    "referenced integer was not collected (taking address of reference)"

	gdb_test "print *g_structref_p" " = <unavailable>"

	# Strings

	# Const string is always available, even when not collected.
	gdb_test "print g_const_string" \
	    " = \"hello world\"$cr" \
	    "non collected const string is still printable"

	gdb_test "print g_string_p" \
	    " = $hex <g_const_string> \"hello world\"" \
	    "printing constant string through collected pointer"

	gdb_test "print g_string_unavail" \
	    " = <unavailable>" \
	    "printing non collected string"

	# Incomplete strings print as an array.
	gdb_test "print g_string_partial" \
	    "\\$\[0-9\]+ = \{<unavailable>, 101 'e', 108 'l', <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>\}" \
	    "printing partially collected string"

	# It is important for this test that the last examined value is
	# <unavailable>, to exercise the case of the $__ convenience
	# variable being set to <unavailable> without error.
	set msg "examining partially collected object"
	gdb_test_multiple "x /10x &struct_b" "$msg" {
	    -re "$hex <struct_b>:${ws}<unavailable>${ws}<unavailable>${ws}<unavailable>${ws}<unavailable>$cr$hex <struct_b\\+16>:${ws}<unavailable>${ws}<unavailable>${ws}0xaaaaaaaa${ws}<unavailable>$cr$hex <struct_b\\+32>:${ws}<unavailable>${ws}<unavailable>$cr$gdb_prompt $" {
		pass "$msg"
	    }
	    -re "value is not available" {
		fail "$msg"
	    }
	}

	gdb_test "p \$__" " = <unavailable>" "last examined value was <unavailable>"

	# This tests that building the array does not require accessing
	# g_int's contents.
	gdb_test "print { 1, g_int, 3 }" \
	    " = \\{1, <unavailable>, 3\\}" \
	    "build array from unavailable value"

	# Note, depends on previous test.
	gdb_test "print \$\[1\]" \
	    " = <unavailable>" \
	    "subscript a non-memory rvalue array, accessing an unvailable element"

	# Access a field of a non-lazy value, making sure the
	# unavailable-ness is propagated.  History values are easy
	# non-lazy values, so use those.  The first test just sets up for
	# the second.
	gdb_test "print g_smallstruct" " = <unavailable>"
	gdb_test "print \$.member" " = <unavailable>"

	# Cast to baseclass, checking the unavailable-ness is propagated.
	gdb_test "print (small_struct) g_smallstruct_b" " = <unavailable>"

	# Same cast, but starting from a non-lazy, value.
	gdb_test "print g_smallstruct_b" " = <unavailable>"
	gdb_test "print (small_struct) \$" " = <unavailable>"

	gdb_test_no_output "set print object on"

	with_test_prefix "print object on" {
	    # With print object on, printing a pointer may need to fetch
	    # the pointed-to object, to check its run-time type.  Make
	    # sure that fails gracefully and transparently when the
	    # pointer itself is unavailable.
	    gdb_test "print virtualp" " = <unavailable>"

	    # no vtable pointer available
	    gdb_test "print derived_unavail" " = <unavailable>"

	    # vtable pointer available, but nothing else
	    gdb_test "print derived_partial" \
		" = \\(Derived\\) {<Middle> = {<Base> = <unavailable>, _vptr.Middle = <unavailable>, y = <unavailable>}, _vptr.Derived = $hex <vtable for Derived.*>, z = <unavailable>}"

	    # whole object available
	    gdb_test "print derived_whole" \
		" = \\(Derived\\) {<Middle> = {<Base> = {x = 2}, _vptr.Middle = $hex, y = 3}, _vptr.Derived = $hex <vtable for Derived.*>, z = 4}"
	}

	gdb_test_no_output "set print object off"

	with_test_prefix "print object off" {
	    gdb_test "print virtualp" " = <unavailable>"

	    # no vtable pointer available
	    gdb_test "print derived_unavail" \
		" = <unavailable>"

	    # vtable pointer available, but nothing else
	    gdb_test "print derived_partial" \
		" = {<Middle> = {<Base> = <unavailable>, _vptr.Middle = <unavailable>, y = <unavailable>}, _vptr.Derived = $hex <vtable for Derived.*>, z = <unavailable>}"

	    # whole object available
	    gdb_test "print derived_whole" \
		" = {<Middle> = {<Base> = {x = 2}, _vptr.Middle = $hex, y = 3}, _vptr.Derived = $hex <vtable for Derived.*>, z = 4}"
	}

	# An instance of a virtual class where we collected everything but
	# the vptr.
	gdb_test "print virtual_partial" \
	    " = {_vptr.Virtual = <unavailable>, z = 0}"

	gdb_test "tfind none" \
	    "#0  end .*" \
	    "cease trace debugging"
    }
}

proc gdb_trace_collection_test {} {
    gdb_collect_globals_test
    gdb_unavailable_registers_test
    gdb_unavailable_floats

    gdb_collect_args_test
    gdb_collect_locals_test local_test_func "auto locals"
    gdb_collect_locals_test reglocal_test_func "register locals"
    gdb_collect_locals_test statlocal_test_func "static locals"
}

runto_main

if { ![gdb_target_supports_trace] } then {
    unsupported "Current target does not support trace"
    return 1
}

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

# Finished!
gdb_test "tfind none" ".*" ""