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binutils-gdb/gdb/testsuite/gdb.trace/unavailable.exp

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# Copyright 1998-2014 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" ".*" ""
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