| # Copyright 2016-2026 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/>. |
| |
| # Test accessing "non-variable" variables, i.e., variables which are |
| # optimized to a constant DWARF location expression and/or |
| # partially/fully optimized out. |
| |
| load_lib dwarf.exp |
| |
| require dwarf2_support |
| |
| standard_testfile main.c -dw.S |
| |
| # Make some DWARF for the test. |
| set asm_file [standard_output_file $srcfile2] |
| |
| Dwarf::assemble $asm_file { |
| global srcfile |
| |
| cu {} { |
| compile_unit { |
| DW_AT_name $srcfile |
| } { |
| declare_labels int_type_label char_type_label \ |
| struct_s_label struct_t_label array_a9_label \ |
| char_ptr_label implicit_a_label stack_b_label |
| |
| int_type_label: base_type { |
| DW_AT_name "int" |
| DW_AT_encoding @DW_ATE_signed |
| DW_AT_byte_size 4 DW_FORM_sdata |
| } |
| char_type_label: base_type { |
| DW_AT_name "char" |
| DW_AT_encoding @DW_ATE_unsigned |
| DW_AT_byte_size 1 DW_FORM_sdata |
| } |
| char_ptr_label: pointer_type { |
| DW_AT_type :$char_type_label |
| } |
| |
| struct_s_label: structure_type { |
| DW_AT_name s |
| DW_AT_byte_size 4 DW_FORM_sdata |
| } { |
| member { |
| DW_AT_name a |
| DW_AT_type :$int_type_label |
| DW_AT_data_member_location 0 DW_FORM_udata |
| DW_AT_bit_size 8 DW_FORM_udata |
| } |
| member { |
| DW_AT_name b |
| DW_AT_type :$int_type_label |
| DW_AT_data_bit_offset 8 DW_FORM_udata |
| DW_AT_bit_size 24 DW_FORM_udata |
| } |
| } |
| |
| struct_t_label: structure_type { |
| DW_AT_name t |
| DW_AT_byte_size 4 DW_FORM_sdata |
| } { |
| member { |
| DW_AT_name a |
| DW_AT_type :$int_type_label |
| DW_AT_data_member_location 0 DW_FORM_udata |
| DW_AT_bit_size 9 DW_FORM_udata |
| } |
| member { |
| DW_AT_name b |
| DW_AT_type :$int_type_label |
| DW_AT_data_bit_offset 9 DW_FORM_udata |
| DW_AT_bit_size 23 DW_FORM_udata |
| } |
| } |
| |
| array_a9_label: array_type { |
| DW_AT_type :$char_type_label |
| } { |
| subrange_type { |
| DW_AT_type :$int_type_label |
| DW_AT_upper_bound 8 DW_FORM_udata |
| } |
| } |
| |
| DW_TAG_subprogram { |
| MACRO_AT_func {main} |
| DW_AT_external 1 flag |
| } { |
| # Simple variable without location. |
| DW_TAG_variable { |
| DW_AT_name undef_int |
| DW_AT_type :$int_type_label |
| } |
| # Struct variable without location. |
| DW_TAG_variable { |
| DW_AT_name undef_s |
| DW_AT_type :$struct_s_label |
| } |
| # Composite location: byte-aligned pieces. |
| DW_TAG_variable { |
| DW_AT_name def_s |
| DW_AT_type :$struct_s_label |
| DW_AT_location { |
| DW_OP_const1u 0 |
| DW_OP_stack_value |
| DW_OP_bit_piece 8 0 |
| DW_OP_const1s -1 |
| DW_OP_stack_value |
| DW_OP_bit_piece 24 0 |
| } SPECIAL_expr |
| } |
| # Composite location: non-byte-aligned pieces. |
| DW_TAG_variable { |
| DW_AT_name def_t |
| DW_AT_type :$struct_t_label |
| DW_AT_location { |
| DW_OP_const2s -184 |
| DW_OP_stack_value |
| DW_OP_bit_piece 9 0 |
| DW_OP_const4u 1752286 |
| DW_OP_stack_value |
| DW_OP_bit_piece 23 0 |
| } SPECIAL_expr |
| } |
| # Composite location with some empty pieces. |
| DW_TAG_variable { |
| DW_AT_name part_def_a |
| DW_AT_type :$array_a9_label |
| DW_AT_location { |
| DW_OP_piece 3 |
| DW_OP_const4u 0xf1927314 |
| DW_OP_stack_value |
| DW_OP_piece 4 |
| DW_OP_piece 2 |
| } SPECIAL_expr |
| } |
| # Implicit location: immediate value. |
| DW_TAG_variable { |
| DW_AT_name def_implicit_s |
| DW_AT_type :$struct_s_label |
| DW_AT_location { |
| DW_OP_implicit_value 0x12 0x34 0x56 0x78 |
| } SPECIAL_expr |
| } |
| # Implicit location: immediate value for whole array, with |
| # excess bytes. |
| implicit_a_label: DW_TAG_variable { |
| DW_AT_name def_implicit_a |
| DW_AT_type :$array_a9_label |
| DW_AT_location { |
| DW_OP_implicit_value 0x1 0x12 0x23 0x34 0x45 \ |
| 0x56 0x67 0x78 0x89 0x9a 0xab |
| } SPECIAL_expr |
| } |
| # Implicit pointer into immediate value. |
| DW_TAG_variable { |
| DW_AT_name implicit_a_ptr |
| DW_AT_type :$char_ptr_label |
| DW_AT_location { |
| DW_OP_implicit_pointer $implicit_a_label 5 |
| } SPECIAL_expr |
| } |
| # Stack-value location. |
| stack_b_label: DW_TAG_variable { |
| DW_AT_name def_stack_b |
| DW_AT_type :$struct_t_label |
| DW_AT_location { |
| DW_OP_const4u 0x1a2b3c4d |
| DW_OP_stack_value |
| } SPECIAL_expr |
| } |
| # Implicit pointer into stack value. |
| DW_TAG_variable { |
| DW_AT_name implicit_b_ptr |
| DW_AT_type :$char_ptr_label |
| DW_AT_location { |
| DW_OP_implicit_pointer $stack_b_label 1 |
| } SPECIAL_expr |
| } |
| } |
| } |
| } |
| } |
| |
| if { [prepare_for_testing "failed to prepare" ${testfile} \ |
| [list $srcfile $asm_file] {nodebug}] } { |
| return |
| } |
| |
| if {![runto_main]} { |
| return |
| } |
| |
| # Determine byte order. |
| set endian [get_endianness] |
| |
| # Byte-aligned objects with simple location descriptions. |
| switch $endian { big {set val 0x345678} little {set val 0x785634} } |
| gdb_test "print/x def_implicit_s" " = \\{a = 0x12, b = $val\\}" |
| gdb_test "print/x def_implicit_s.b" " = $val" |
| gdb_test "print/x def_implicit_a" \ |
| " = \\{0x1, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89\\}" |
| gdb_test "print/x def_implicit_a\[5\]" " = 0x56" |
| gdb_test "print/x *(char (*)\[5\]) implicit_a_ptr" \ |
| " = \\{0x56, 0x67, 0x78, 0x89, 0x9a\\}" |
| switch $endian { |
| big {set val "a = 52, b = 2833485"} |
| little {set val "a = 77, b = 857502"} |
| } |
| gdb_test "print def_stack_b" " = \\{$val\\}" |
| switch $endian {big {set val 0x2b} little {set val 0x3c}} |
| gdb_test "print/x *implicit_b_ptr" " = $val" |
| |
| # Byte-aligned fields, pieced together from DWARF stack values. |
| gdb_test "print def_s" " = \\{a = 0, b = -1\\}" |
| switch $endian { big {set val 0x92} little {set val 0x73} } |
| gdb_test "print/x part_def_a\[4\]" " = $val" |
| gdb_test "print/x part_def_a\[8\]" " = <optimized out>" |
| |
| # Non-byte-aligned fields, pieced together from DWARF stack values. |
| gdb_test "print def_t" " = \\{a = -184, b = 1752286\\}" |
| |
| # Simple variable without location. |
| gdb_test "print undef_int" " = <optimized out>" |
| |
| # Member of a structure without location. |
| gdb_test "print undef_s.a" " = <optimized out>" |
