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42a4f53d | 1 | # Copyright 2016-2019 Free Software Foundation, Inc. |
3326303b MG |
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 array whose location is a DW_OP_addr. | |
18 | ||
19 | if [skip_cplus_tests] { | |
20 | continue | |
21 | } | |
22 | ||
23 | load_lib dwarf.exp | |
24 | ||
25 | # This test can only be run on targets which support DWARF-2 and use gas. | |
26 | if ![dwarf2_support] { | |
27 | return 0 | |
28 | } | |
29 | ||
30 | # We'll place the output of Dwarf::assemble in implref-array.S. | |
31 | standard_testfile .c .S | |
32 | ||
33 | # ${testfile} is now "implref-array". srcfile2 is "implref-array.S". | |
34 | set executable ${testfile} | |
35 | set asm_file [standard_output_file ${srcfile2}] | |
36 | ||
37 | # We need to know the size of integer and address types in order | |
38 | # to write some of the debugging info we'd like to generate. | |
39 | # | |
40 | # For that, we ask GDB by debugging our implref-array program. | |
41 | # Any program would do, but since we already have implref-array | |
42 | # specifically for this testcase, might as well use that. | |
5b362f04 | 43 | if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } { |
3326303b MG |
44 | return -1 |
45 | } | |
46 | ||
47 | set array_length [get_valueof "/u" "sizeof(array) / sizeof(array\[0\])" -1] | |
48 | ||
49 | # Create the DWARF. We need a regular variable which represents the array, and | |
50 | # a reference to it that'll be marked with DW_OP_GNU_implicit_pointer. | |
51 | # The variable must be global so that its name is an exported symbol that we | |
52 | # can reference from the DWARF using gdb_target_symbol. | |
53 | Dwarf::assemble ${asm_file} { | |
54 | global srcdir subdir srcfile array_length | |
55 | ||
56 | cu {} { | |
57 | DW_TAG_compile_unit { | |
58 | {DW_AT_language @DW_LANG_C_plus_plus} | |
59 | } { | |
60 | declare_labels int_label sizetype_label array_label variable_label ref_label | |
61 | set int_size [get_sizeof "int" -1] | |
62 | set upper_bound [expr ${array_length} - 1] | |
63 | ||
64 | # gdb always assumes references are implemented as pointers. | |
65 | set addr_size [get_sizeof "void *" -1] | |
66 | ||
67 | int_label: DW_TAG_base_type { | |
68 | {DW_AT_byte_size ${int_size} DW_FORM_udata} | |
69 | {DW_AT_encoding @DW_ATE_signed} | |
70 | {DW_AT_name "int"} | |
71 | } | |
72 | ||
73 | sizetype_label: DW_TAG_base_type { | |
74 | {DW_AT_byte_size ${int_size} DW_FORM_udata} | |
75 | {DW_AT_encoding @DW_ATE_unsigned} | |
76 | {DW_AT_name "sizetype"} | |
77 | } | |
78 | ||
79 | array_label: DW_TAG_array_type { | |
80 | {DW_AT_type :${int_label}} | |
81 | } { | |
82 | DW_TAG_subrange_type { | |
83 | {DW_AT_type :${sizetype_label}} | |
84 | {DW_AT_lower_bound 0 DW_FORM_udata} | |
85 | {DW_AT_upper_bound ${upper_bound} DW_FORM_udata} | |
86 | } | |
87 | } | |
88 | ||
89 | ref_label: DW_TAG_reference_type { | |
90 | {DW_AT_byte_size ${addr_size} DW_FORM_udata} | |
91 | {DW_AT_type :${array_label}} | |
92 | } | |
93 | ||
94 | variable_label: DW_TAG_variable { | |
95 | {DW_AT_name "array"} | |
96 | {DW_AT_type :${array_label}} | |
97 | {DW_AT_external 1 DW_FORM_flag} | |
98 | {DW_AT_location {DW_OP_addr [gdb_target_symbol "array"]} SPECIAL_expr} | |
99 | } | |
100 | ||
101 | DW_TAG_subprogram { | |
102 | {MACRO_AT_func { "main" "${srcdir}/${subdir}/${srcfile}" }} | |
103 | {DW_AT_type :${int_label}} | |
104 | {DW_AT_external 1 DW_FORM_flag} | |
105 | } { | |
106 | DW_TAG_variable { | |
107 | {DW_AT_name "ref"} | |
108 | {DW_AT_type :${ref_label}} | |
109 | {DW_AT_location {DW_OP_GNU_implicit_pointer ${variable_label} 0} SPECIAL_expr} | |
110 | } | |
111 | } | |
112 | } | |
113 | } | |
114 | } | |
115 | ||
5b362f04 | 116 | if [prepare_for_testing "failed to prepare" ${executable} [list ${asm_file} ${srcfile}] {}] { |
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117 | return -1 |
118 | } | |
119 | ||
120 | # DW_OP_GNU_implicit_pointer implementation requires a valid frame. | |
121 | if ![runto_main] { | |
122 | return -1 | |
123 | } | |
124 | ||
125 | # This matches e.g. '(int (&)[5])' | |
126 | set ref_type [format {\(int \(&\)\[%d\]\)} ${array_length}] | |
127 | ||
128 | # This matches e.g. '(int (*)[5])' | |
129 | set ptr_type [format {\(int \(\*\)\[%d\]\)} ${array_length}] | |
130 | ||
131 | # Contents of the array. Trim leading/trailing whitespace, '{' and '}' | |
132 | # since they confuse TCL to no end. | |
133 | set contents [get_valueof "" "array" ""] | |
134 | set contents [string trim ${contents}] | |
135 | set contents [string trim ${contents} "{}"] | |
136 | ||
137 | # Address of the referenced value. | |
138 | set address [get_hexadecimal_valueof "&array" ""] | |
139 | ||
140 | # Doing 'print ref' should show us e.g. '(int (&)[5]) 0xdeadbeef: {0, 1, 2, 3, 4}'. | |
141 | gdb_test "print ref" " = ${ref_type} @${address}: \\{${contents}\\}" | |
142 | ||
143 | # Doing 'print &ref' should show us e.g. '(int (*)[5]) 0xdeadbeef <array>'. | |
144 | gdb_test "print &ref" " = ${ptr_type} ${address} <array>" | |
145 | ||
146 | # gdb assumes C++ references are implemented as pointers, and print &(&ref) | |
147 | # shows us the underlying pointer's address. Since in this case there's no | |
148 | # physical pointer, gdb should tell us so. | |
149 | gdb_test "print &(&ref)" "Attempt to take address of value not located in memory." | |
150 | ||
151 | # Test assignment through the synthetic reference. | |
152 | set first_value 10 | |
153 | gdb_test_no_output "set (ref\[0\] = ${first_value})" | |
154 | ||
155 | # This matches '{10, 1, 2, 3, 4}'. | |
156 | set new_contents [format {\{%d, 1, 2, 3, 4\}} ${first_value}] | |
157 | ||
158 | # Doing 'print ref' should now show us e.g. | |
159 | # '(int (&)[5]) <synthetic pointer>: {10, 1, 2, 3, 4}'. | |
160 | gdb_test "print ref" " = ${ref_type} @${address}: ${new_contents}" "print ref after assignment" | |
161 | gdb_test "print array" " = ${new_contents}" "print array after assignment" | |
162 | ||
163 | # Test treating the array as a pointer. | |
164 | set second_value 20 | |
165 | set new_contents [format {\{%d, %d, 2, 3, 4\}} ${first_value} ${second_value}] | |
166 | ||
167 | gdb_test "print *ref" " = ${first_value}" | |
168 | gdb_test_no_output "set (*(ref + 1) = ${second_value})" | |
169 | gdb_test "print ref\[1\]" " = ${second_value}" | |
170 | gdb_test "print array" " = ${new_contents}" "print array after second assignment" |