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