251 lines
6.6 KiB
Plaintext
251 lines
6.6 KiB
Plaintext
# Copyright 2016-2017 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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# This test ensures that with "set print object on", -var-create will
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# return "<optimized out>" for an optimized out pointer to structure,
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# rather than attempting to dereference the pointer to determine its
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# actual type (instead of its declared type). We want to test that GDB
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# can display such a pointer without throwing an error, while also
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# ensuring that any attempt to dereference the pointer *will* throw an
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# error.
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load_lib dwarf.exp
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# This test can only be run on targets which support DWARF-2 and use gas.
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if {![dwarf2_support]} {
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return 0
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}
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standard_testfile dw2-opt-structptr.c dw2-opt-structptr-dw.S
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# Generate a test program with dwarf information showing the variable
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# 'ptr', a pointer-to-struct, as optimized out. The dwarf will also
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# describe the structure as have a scalar, array, and pointer-to-struct
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# members.
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proc build_test_program {} {
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global testfile srcfile srcfile2
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# Make some DWARF for the test.
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set asm_file [standard_output_file $srcfile2]
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Dwarf::assemble $asm_file {
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global srcdir subdir srcfile
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# Creating a CU with 4-byte addresses lets this test link on
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# both 32- and 64-bit machines.
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cu { addr_size 4 } {
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DW_TAG_compile_unit {
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{DW_AT_language @DW_LANG_C99}
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{DW_AT_name dw2-opt-structptr.c}
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{DW_AT_comp_dir /tmp}
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} {
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declare_labels int_label struct_label pointer_label \
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array_label
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int_label: DW_TAG_base_type {
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{DW_AT_byte_size 4 DW_FORM_sdata}
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{DW_AT_encoding @DW_ATE_signed}
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{DW_AT_name integer}
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}
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array_label: DW_TAG_array_type {
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{DW_AT_name foo__array_type}
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{DW_AT_type :$int_label}
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} {
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DW_TAG_subrange_type {
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{DW_AT_type :$int_label}
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{DW_AT_lower_bound 0 DW_FORM_data1}
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{DW_AT_upper_bound 127 DW_FORM_data1}
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}
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}
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struct_label: DW_TAG_structure_type {
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{DW_AT_name "foo"}
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{DW_AT_byte_size 12 DW_FORM_sdata}
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} {
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member {
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{name a}
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{type :$int_label}
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{data_member_location 0 data1}
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}
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member {
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{name x}
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{type :$array_label}
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{data_member_location 4 data1}
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}
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member {
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{name y}
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{type :$pointer_label}
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{data_member_location 8 data1}
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}
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}
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pointer_label: DW_TAG_pointer_type {
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{DW_AT_byte_size 4 DW_FORM_sdata}
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{DW_AT_type :$struct_label}
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}
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DW_TAG_subprogram {
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{DW_AT_name func01}
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{DW_AT_type :$int_label}
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{external 1 flag}
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{MACRO_AT_func {func01 ${srcdir}/${subdir}/${srcfile}}}
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} {
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DW_TAG_variable {
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{DW_AT_name ptr}
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{DW_AT_type :$pointer_label}
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{DW_AT_location {} DW_FORM_block1}
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}
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}
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DW_TAG_subprogram {
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{DW_AT_name main}
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{DW_AT_type :$int_label}
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{external 1 flag}
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{MACRO_AT_func {main ${srcdir}/${subdir}/${srcfile}}}
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} {
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}
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}
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}
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}
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set sources "$srcfile $asm_file"
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if {[build_executable $testfile.exp $testfile $sources {nodebug}]} {
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untested "failed to compile"
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return -1
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}
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}
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# Test access to an optimized-out pointer-to-struct using the
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# console interpreter.
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proc do_console_test {} {
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global binfile
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clean_restart $binfile
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with_test_prefix "console" {
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gdb_test_no_output "set print object on"
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if {![runto_main]} {
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return -1
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}
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if {![runto func01]} {
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return -1
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}
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gdb_test "info addr ptr" "Symbol \"ptr\" is optimized out."
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gdb_test "print ptr" "<optimized out>"
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gdb_test "print *ptr" "value has been optimized out"
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gdb_test "print ptr->a" "value has been optimized out"
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gdb_test "print ptr->x" "value has been optimized out"
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gdb_test "print ptr->y" "value has been optimized out"
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}
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}
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# Test access to an optimized-out pointer-to-struct using the
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# MI interpreter.
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proc do_mi_test {} {
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load_lib mi-support.exp
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set MIFLAGS "-i=mi"
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global mi_gdb_prompt
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global srcdir
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global subdir
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global binfile
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with_test_prefix "mi" {
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gdb_exit
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if {[mi_gdb_start]} {
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return -1
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}
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mi_delete_breakpoints
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mi_gdb_reinitialize_dir $srcdir/$subdir
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mi_gdb_load $binfile
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# This causes GDB to dereference a pointer-to-structure when doing
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# -var-create.
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mi_gdb_test "-gdb-set print object on" ".*" "set print object on"
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mi_gdb_test "-break-insert main" ".*" "insert breakpoint main"
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mi_gdb_test "-break-insert func01" ".*" "insert breakpoint func01"
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# Run to main. Use an explicit expect here since the limited
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# debug info will result in output that isn't handled by the
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# MI test utilities.
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set test "run to main"
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mi_run_cmd
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gdb_expect {
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-re "\\*stopped,reason=\"breakpoint-hit\".*func=\"main\".*$mi_gdb_prompt$" {
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pass "$test"
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}
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timeout {
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fail "$test (timeout)"
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}
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}
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# Run to func01. Use an explicit expect here as above.
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set test "continue to func01"
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mi_send_resuming_command "exec-continue" "$test"
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gdb_expect {
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-re "\\*stopped,reason=\"breakpoint-hit\".*func=\"func01\".*$mi_gdb_prompt$" {
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pass "$test"
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}
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timeout {
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fail "$test (timeout)"
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}
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}
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# Test that -var-create for 'ptr' is successful.
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mi_create_varobj "var1" "ptr" "create varobj for ptr"
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# Test that -var-list-children of 'ptr' is successful.
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mi_list_varobj_children "var1" { \
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{var1.a a 0 integer} \
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{var1.x x 128 foo__array_type} \
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{var1.y y 3 "struct foo \\*"} \
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} "get children of var1 (ptr)"
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# Test that dereferencing 'ptr' will throw an error.
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mi_gdb_test "-var-create var2 * &((ptr)->a)" \
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"\\^error,msg=\"value has been optimized out\"" \
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"throw error, dereference ptr to access integer member "
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# Test that dereferencing 'ptr' will throw an error.
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mi_gdb_test "-var-create var3 * &((ptr)->x)" \
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"\\^error,msg=\"value has been optimized out\"" \
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"throw error, dereference ptr to access array member "
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# Test that dereferencing 'ptr' will throw an error.
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mi_gdb_test "-var-create var4 * &((ptr)->y)" \
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"\\^error,msg=\"value has been optimized out\"" \
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"throw error, dereference ptr to access pointer member "
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}
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}
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build_test_program
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do_console_test
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do_mi_test
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