1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
# Copyright 2016-2017 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
if {![dwarf2_support]} { return 0 }
standard_testfile main.c nonvar-access-dw.S
# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
cu {} {
compile_unit {
{DW_AT_name main.c}
} {
declare_labels int_type_label char_type_label \
struct_s_label struct_t_label array_a9_label \
char_ptr_label implicit_a_label
int_type_label: base_type {
{name "int"}
{encoding @DW_ATE_signed}
{byte_size 4 DW_FORM_sdata}
}
char_type_label: base_type {
{name "char"}
{encoding @DW_ATE_unsigned}
{byte_size 1 DW_FORM_sdata}
}
char_ptr_label: pointer_type {
{type :$char_type_label}
}
struct_s_label: structure_type {
{name s}
{byte_size 4 DW_FORM_sdata}
} {
member {
{name a}
{type :$int_type_label}
{data_member_location 0 DW_FORM_udata}
{bit_size 8 DW_FORM_udata}
}
member {
{name b}
{type :$int_type_label}
{data_bit_offset 8 DW_FORM_udata}
{bit_size 24 DW_FORM_udata}
}
}
struct_t_label: structure_type {
{name t}
{byte_size 4 DW_FORM_sdata}
} {
member {
{name a}
{type :$int_type_label}
{data_member_location 0 DW_FORM_udata}
{bit_size 9 DW_FORM_udata}
}
member {
{name b}
{type :$int_type_label}
{data_bit_offset 9 DW_FORM_udata}
{bit_size 23 DW_FORM_udata}
}
}
array_a9_label: array_type {
{type :$char_type_label}
} {
subrange_type {
{type :$int_type_label}
{upper_bound 8 DW_FORM_udata}
}
}
DW_TAG_subprogram {
{name main}
{DW_AT_external 1 flag}
{low_pc [gdb_target_symbol main] DW_FORM_addr}
{high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
} {
# Simple variable without location.
DW_TAG_variable {
{name undef_int}
{type :$int_type_label}
}
# Struct variable without location.
DW_TAG_variable {
{name undef_s}
{type :$struct_s_label}
}
# Composite location: byte-aligned pieces.
DW_TAG_variable {
{name def_s}
{type :$struct_s_label}
{location {
const1u 0
stack_value
bit_piece 8 0
const1s -1
stack_value
bit_piece 24 0
} SPECIAL_expr}
}
# Composite location: non-byte-aligned pieces.
DW_TAG_variable {
{name def_t}
{type :$struct_t_label}
{location {
const1u 0
stack_value
bit_piece 9 0
const1s -1
stack_value
bit_piece 23 0
} SPECIAL_expr}
}
# Implicit location: immediate value.
DW_TAG_variable {
{name def_implicit_s}
{type :$struct_s_label}
{location {
implicit_value 0x12 0x34 0x56 0x78
} SPECIAL_expr}
}
# Implicit location: immediate value for whole array, with
# excess bytes.
implicit_a_label: DW_TAG_variable {
{name def_implicit_a}
{type :$array_a9_label}
{location {
implicit_value 0x1 0x12 0x23 0x34 0x45 \
0x56 0x67 0x78 0x89 0x9a 0xab
} SPECIAL_expr}
}
# Implicit pointer into immediate value.
DW_TAG_variable {
{name implicit_a_ptr}
{type :$char_ptr_label}
{location {
GNU_implicit_pointer $implicit_a_label 5
} SPECIAL_expr}
}
}
}
}
}
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
if ![runto_main] {
return -1
}
# Determine endianness.
set endian "little"
gdb_test_multiple "show endian" "determine endianness" {
-re ".* (big|little) endian.*$gdb_prompt $" {
set endian $expect_out(1,string)
pass "endianness: $endian"
}
}
# 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\\}"
# Byte-aligned fields, pieced together from DWARF stack values.
gdb_test "print def_s" " = \\{a = 0, b = -1\\}"
# Non-byte-aligned fields, pieced together from DWARF stack values.
gdb_test "print def_t" " = \\{a = 0, b = -1\\}"
# 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>"
|
