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
|
# Copyright 2017-2024 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 the symbol needs check mechanism if it assumes that faking
# reads from a target is a safe thing to do.
#
# In particular, the test uses a relative branch DWARF operation to
# potentially cause an infinite loop, if the target reads are indeed
# faked.
load_lib dwarf.exp
# This test can only be run on targets which support DWARF-2 and use gas.
require dwarf2_support
# Choose suitable integer registers for the test.
set dwarf_regnum 0
if { [is_aarch64_target] } {
set regname x0
} elseif { [is_aarch32_target]
|| [istarget "s390*-*-*" ]
|| [istarget "powerpc*-*-*"]
|| [istarget "rs6000*-*-aix*"] } {
set regname r0
} elseif { [is_x86_like_target] } {
set regname eax
} elseif { [is_amd64_regs_target] } {
set regname rax
} else {
verbose "Skipping ${gdb_test_file_name}."
return
}
standard_testfile symbol_needs_eval.c ${gdb_test_file_name}-dw.S
if [prepare_for_testing "failed to prepare" $testfile $srcfile {debug}] {
return
}
set int_size [get_sizeof "int" -1]
# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
global dwarf_regnum regname int_size
set exec_mask_var [gdb_target_symbol exec_mask]
cu {} {
DW_TAG_compile_unit {
{DW_AT_name symbol_needs_eval.c}
{DW_AT_comp_dir /tmp}
} {
declare_labels int_type_label
# define int type
int_type_label: DW_TAG_base_type {
{DW_AT_name "int"}
{DW_AT_encoding @DW_ATE_signed}
{DW_AT_byte_size $int_size DW_FORM_sdata}
}
# add info for variable exec_mask
DW_TAG_variable {
{DW_AT_name exec_mask}
{DW_AT_type :$int_type_label}
{DW_AT_location {
DW_OP_addr $exec_mask_var
} SPECIAL_expr}
{external 1 flag}
}
# add info for subprogram main
DW_TAG_subprogram {
{MACRO_AT_func { main }}
{DW_AT_frame_base {
DW_OP_regx $dwarf_regnum
} SPECIAL_expr}
} {
# define artificial variable a
DW_TAG_variable {
{DW_AT_name a}
{DW_AT_type :$int_type_label}
{DW_AT_location {
DW_OP_lit1
DW_OP_addr $exec_mask_var
DW_OP_deref_size $int_size
# jump to DW_OP_fbreg
DW_OP_skip 4
DW_OP_drop
DW_OP_fbreg 0
DW_OP_dup
DW_OP_lit0
DW_OP_eq
# conditional jump to DW_OP_drop
DW_OP_bra -9
DW_OP_stack_value
} SPECIAL_expr}
{external 1 flag}
}
}
}
}
}
if { [prepare_for_testing ${testfile}.exp ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
if ![runto_main] {
return -1
}
gdb_test_no_output "set var \$$regname = 2" "init reg to 2"
gdb_test_no_output "set var exec_mask = 0" "init exec_mask to 0"
gdb_test "print/d a" " = 2" "a == 2"
|
