242 lines
6.1 KiB
Plaintext
242 lines
6.1 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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# Test accessing "non-variable" variables, i.e., variables which are
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# optimized to a constant DWARF location expression and/or
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# partially/fully optimized out.
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load_lib dwarf.exp
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if {![dwarf2_support]} { return 0 }
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standard_testfile main.c nonvar-access-dw.S
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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 $asm_file {
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cu {} {
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compile_unit {
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{DW_AT_name main.c}
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} {
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declare_labels int_type_label char_type_label \
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struct_s_label struct_t_label array_a9_label \
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char_ptr_label implicit_a_label stack_b_label
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int_type_label: base_type {
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{name "int"}
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{encoding @DW_ATE_signed}
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{byte_size 4 DW_FORM_sdata}
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}
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char_type_label: base_type {
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{name "char"}
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{encoding @DW_ATE_unsigned}
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{byte_size 1 DW_FORM_sdata}
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}
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char_ptr_label: pointer_type {
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{type :$char_type_label}
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}
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struct_s_label: structure_type {
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{name s}
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{byte_size 4 DW_FORM_sdata}
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} {
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member {
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{name a}
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{type :$int_type_label}
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{data_member_location 0 DW_FORM_udata}
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{bit_size 8 DW_FORM_udata}
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}
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member {
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{name b}
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{type :$int_type_label}
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{data_bit_offset 8 DW_FORM_udata}
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{bit_size 24 DW_FORM_udata}
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}
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}
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struct_t_label: structure_type {
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{name t}
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{byte_size 4 DW_FORM_sdata}
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} {
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member {
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{name a}
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{type :$int_type_label}
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{data_member_location 0 DW_FORM_udata}
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{bit_size 9 DW_FORM_udata}
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}
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member {
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{name b}
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{type :$int_type_label}
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{data_bit_offset 9 DW_FORM_udata}
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{bit_size 23 DW_FORM_udata}
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}
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}
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array_a9_label: array_type {
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{type :$char_type_label}
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} {
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subrange_type {
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{type :$int_type_label}
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{upper_bound 8 DW_FORM_udata}
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}
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}
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DW_TAG_subprogram {
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{name main}
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{DW_AT_external 1 flag}
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{low_pc [gdb_target_symbol main] DW_FORM_addr}
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{high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
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} {
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# Simple variable without location.
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DW_TAG_variable {
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{name undef_int}
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{type :$int_type_label}
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}
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# Struct variable without location.
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DW_TAG_variable {
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{name undef_s}
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{type :$struct_s_label}
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}
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# Composite location: byte-aligned pieces.
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DW_TAG_variable {
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{name def_s}
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{type :$struct_s_label}
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{location {
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const1u 0
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stack_value
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bit_piece 8 0
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const1s -1
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stack_value
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bit_piece 24 0
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} SPECIAL_expr}
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}
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# Composite location: non-byte-aligned pieces.
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DW_TAG_variable {
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{name def_t}
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{type :$struct_t_label}
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{location {
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const2s -184
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stack_value
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bit_piece 9 0
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const4u 1752286
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stack_value
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bit_piece 23 0
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} SPECIAL_expr}
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}
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# Composite location with some empty pieces.
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DW_TAG_variable {
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{name part_def_a}
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{type :$array_a9_label}
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{location {
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piece 3
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const4u 0xf1927314
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stack_value
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piece 4
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piece 2
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} SPECIAL_expr}
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}
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# Implicit location: immediate value.
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DW_TAG_variable {
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{name def_implicit_s}
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{type :$struct_s_label}
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{location {
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implicit_value 0x12 0x34 0x56 0x78
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} SPECIAL_expr}
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}
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# Implicit location: immediate value for whole array, with
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# excess bytes.
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implicit_a_label: DW_TAG_variable {
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{name def_implicit_a}
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{type :$array_a9_label}
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{location {
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implicit_value 0x1 0x12 0x23 0x34 0x45 \
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0x56 0x67 0x78 0x89 0x9a 0xab
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} SPECIAL_expr}
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}
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# Implicit pointer into immediate value.
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DW_TAG_variable {
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{name implicit_a_ptr}
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{type :$char_ptr_label}
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{location {
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implicit_pointer $implicit_a_label 5
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} SPECIAL_expr}
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}
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# Stack-value location.
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stack_b_label: DW_TAG_variable {
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{name def_stack_b}
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{type :$struct_t_label}
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{location {
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const4u 0x1a2b3c4d
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stack_value
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} SPECIAL_expr}
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}
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# Implicit pointer into stack value.
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DW_TAG_variable {
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{name implicit_b_ptr}
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{type :$char_ptr_label}
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{location {
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implicit_pointer $stack_b_label 1
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} SPECIAL_expr}
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}
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}
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}
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}
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}
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if { [prepare_for_testing "failed to prepare" ${testfile} \
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[list $srcfile $asm_file] {nodebug}] } {
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return -1
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}
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if ![runto_main] {
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return -1
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}
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# Determine byte order.
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set endian [get_endianness]
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# Byte-aligned objects with simple location descriptions.
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switch $endian { big {set val 0x345678} little {set val 0x785634} }
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gdb_test "print/x def_implicit_s" " = \\{a = 0x12, b = $val\\}"
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gdb_test "print/x def_implicit_s.b" " = $val"
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gdb_test "print/x def_implicit_a" \
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" = \\{0x1, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78, 0x89\\}"
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gdb_test "print/x def_implicit_a\[5\]" " = 0x56"
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gdb_test "print/x *(char (*)\[5\]) implicit_a_ptr" \
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" = \\{0x56, 0x67, 0x78, 0x89, 0x9a\\}"
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switch $endian {
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big {set val "a = 52, b = 2833485"}
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little {set val "a = 77, b = 857502"}
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}
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gdb_test "print def_stack_b" " = \\{$val\\}"
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switch $endian {big {set val 0x2b} little {set val 0x3c}}
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gdb_test "print/x *implicit_b_ptr" " = $val"
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# Byte-aligned fields, pieced together from DWARF stack values.
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gdb_test "print def_s" " = \\{a = 0, b = -1\\}"
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switch $endian { big {set val 0x92} little {set val 0x73} }
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gdb_test "print/x part_def_a\[4\]" " = $val"
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gdb_test "print/x part_def_a\[8\]" " = <optimized out>"
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# Non-byte-aligned fields, pieced together from DWARF stack values.
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gdb_test "print def_t" " = \\{a = -184, b = 1752286\\}"
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# Simple variable without location.
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gdb_test "print undef_int" " = <optimized out>"
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# Member of a structure without location.
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gdb_test "print undef_s.a" " = <optimized out>"
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