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1d506c26 | 1 | # Copyright 2016-2024 Free Software Foundation, Inc. |
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2 | |
3 | # This program is free software; you can redistribute it and/or modify | |
4 | # it under the terms of the GNU General Public License as published by | |
5 | # the Free Software Foundation; either version 3 of the License, or | |
6 | # (at your option) any later version. | |
7 | # | |
8 | # This program is distributed in the hope that it will be useful, | |
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | # GNU General Public License for more details. | |
12 | # | |
13 | # You should have received a copy of the GNU General Public License | |
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | # Test a C++ reference marked with DW_OP_GNU_implicit_pointer. | |
17 | # The referenced value is a global struct whose location is a DW_OP_addr. | |
18 | ||
0b94d2b9 | 19 | require allow_cplus_tests |
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20 | |
21 | load_lib dwarf.exp | |
22 | ||
23 | # This test can only be run on targets which support DWARF-2 and use gas. | |
ce8d533e | 24 | require dwarf2_support |
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25 | |
26 | # We'll place the output of Dwarf::assemble in implref-struct.S. | |
27 | standard_testfile .c .S | |
28 | ||
29 | # ${testfile} is now "implref-struct". srcfile2 is "implref-struct.S". | |
30 | set executable ${testfile} | |
31 | set asm_file [standard_output_file ${srcfile2}] | |
32 | ||
33 | # We need to know the size of integer and address types in order | |
34 | # to write some of the debugging info we'd like to generate. | |
35 | # | |
36 | # For that, we ask GDB by debugging our implref-struct program. | |
37 | # Any program would do, but since we already have implref-struct | |
38 | # specifically for this testcase, might as well use that. | |
5b362f04 | 39 | if [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} {debug c++}] { |
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40 | return -1 |
41 | } | |
42 | ||
43 | # Create the DWARF. We need a regular variable for the struct and a reference | |
44 | # to it that'll be marked with DW_OP_GNU_implicit_pointer. The variable must be | |
45 | # global so that its name is an exported symbol that can we can reference from | |
46 | # the DWARF using gdb_target_symbol. | |
47 | Dwarf::assemble ${asm_file} { | |
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48 | cu {} { |
49 | DW_TAG_compile_unit { | |
50 | {DW_AT_language @DW_LANG_C_plus_plus} | |
51 | } { | |
52 | declare_labels int_label struct_label variable_label ref_label | |
53 | set int_size [get_sizeof "int" -1] | |
54 | ||
55 | # gdb always assumes references are implemented as pointers. | |
56 | set addr_size [get_sizeof "void *" -1] | |
57 | set S_size [get_sizeof "S" -1] | |
58 | ||
59 | # The compiler shouldn't introduce structure padding here. | |
60 | set b_offset 4 | |
61 | set c_offset 8 | |
62 | ||
63 | int_label: DW_TAG_base_type { | |
64 | {DW_AT_byte_size ${int_size} DW_FORM_udata} | |
65 | {DW_AT_encoding @DW_ATE_signed} | |
66 | {DW_AT_name "int"} | |
67 | } | |
68 | ||
69 | struct_label: DW_TAG_structure_type { | |
70 | {DW_AT_name "S"} | |
71 | {DW_AT_byte_size ${S_size} DW_FORM_udata} | |
72 | } { | |
73 | DW_TAG_member { | |
74 | {DW_AT_name "a"} | |
75 | {DW_AT_type :${int_label}} | |
76 | {DW_AT_data_member_location 0 DW_FORM_udata} | |
77 | } | |
78 | ||
79 | DW_TAG_member { | |
80 | {DW_AT_name "b"} | |
81 | {DW_AT_type :${int_label}} | |
82 | {DW_AT_data_member_location ${b_offset} DW_FORM_udata} | |
83 | } | |
84 | ||
85 | DW_TAG_member { | |
86 | {DW_AT_name "c"} | |
87 | {DW_AT_type :${int_label}} | |
88 | {DW_AT_data_member_location ${c_offset} DW_FORM_udata} | |
89 | } | |
90 | } | |
91 | ||
92 | ref_label: DW_TAG_reference_type { | |
93 | {DW_AT_byte_size ${addr_size} DW_FORM_udata} | |
94 | {DW_AT_type :${struct_label}} | |
95 | } | |
96 | ||
97 | variable_label: DW_TAG_variable { | |
98 | {DW_AT_name "s1"} | |
99 | {DW_AT_type :${struct_label}} | |
100 | {DW_AT_external 1 DW_FORM_flag} | |
101 | {DW_AT_location {DW_OP_addr [gdb_target_symbol "s1"]} SPECIAL_expr} | |
102 | } | |
103 | ||
104 | DW_TAG_variable { | |
105 | {DW_AT_name "s2"} | |
106 | {DW_AT_type :${struct_label}} | |
107 | {DW_AT_external 1 DW_FORM_flag} | |
108 | {DW_AT_location {DW_OP_addr [gdb_target_symbol "s2"]} SPECIAL_expr} | |
109 | } | |
110 | ||
111 | DW_TAG_subprogram { | |
10da644d | 112 | {MACRO_AT_func { "main" }} |
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113 | {DW_AT_type :${int_label}} |
114 | {DW_AT_external 1 DW_FORM_flag} | |
115 | } { | |
116 | DW_TAG_variable { | |
117 | {DW_AT_name "ref"} | |
118 | {DW_AT_type :${ref_label}} | |
119 | {DW_AT_location {DW_OP_GNU_implicit_pointer ${variable_label} 0} SPECIAL_expr} | |
120 | } | |
121 | } | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
5b362f04 | 126 | if [prepare_for_testing "failed to prepare" ${executable} [list ${asm_file} ${srcfile}] {}] { |
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127 | return -1 |
128 | } | |
129 | ||
130 | # DW_OP_GNU_implicit_pointer implementation requires a valid frame. | |
131 | if ![runto_main] { | |
132 | return -1 | |
133 | } | |
134 | ||
135 | # Returns the struct members, e.g. '{a = 0, b = 1, c = 2}'. | |
136 | proc get_members {var} { | |
137 | set members [get_valueof "" ${var} ""] | |
138 | ||
139 | # Trim leading/trailing whitespace, '{' and '}' since they confuse TCL to no end. | |
140 | set members [string trim ${members}] | |
141 | set members [string trim ${members} "{}"] | |
142 | ||
143 | return ${members} | |
144 | } | |
145 | ||
146 | # Values of the struct members. | |
147 | set s1_members [get_members "s1"] | |
148 | set s2_members [get_members "s2"] | |
149 | ||
150 | # Address of the referenced value. | |
151 | set address [get_hexadecimal_valueof "&s1" ""] | |
152 | ||
153 | # Test printing with both 'set print object off' and 'on', just to make sure | |
154 | # the output doesn't change. | |
155 | foreach_with_prefix print-object {"off" "on"} { | |
156 | gdb_test_no_output "set print object ${print-object}" | |
157 | ||
158 | # Doing 'print ref' should show us e.g. | |
159 | # '(S &) @0xdeadbeef: {a = 0, b = 1, c = 2}'. | |
160 | gdb_test "print ref" " = \\(S &\\) @${address}: \\{${s1_members}\\}" | |
161 | ||
162 | # Doing 'print &ref' should show us e.g. '(S *) 0xdeadbeef <s1>'. | |
163 | gdb_test "print &ref" " = \\(S \\*\\) ${address} <s1>" | |
164 | ||
165 | # gdb assumes C++ references are implemented as pointers, and | |
166 | # print &(&ref) shows us the underlying pointer's address. | |
167 | # Since in this case there's no physical pointer, gdb should tell us so. | |
168 | gdb_test "print &(&ref)" "Attempt to take address of value not located in memory." | |
169 | } | |
170 | ||
171 | # Test assignment through the synthetic reference. | |
172 | gdb_test_no_output "set (ref = s2)" | |
173 | ||
111b33f0 TV |
174 | with_test_prefix "after assignment" { |
175 | foreach_with_prefix print-object {"off" "on"} { | |
176 | gdb_test_no_output "set print object ${print-object}" | |
3326303b | 177 | |
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178 | gdb_test "print ref" " = \\(S &\\) @${address}: \\{${s2_members}\\}" "print ref" |
179 | gdb_test "print s1" " = \\{${s2_members}\\}" "print s1" | |
180 | } | |
3326303b | 181 | } |