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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 variable 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-global.S. | |
27 | standard_testfile .c .S | |
28 | ||
29 | # ${testfile} is now "implref-global". srcfile2 is "implref-global.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-global program. | |
37 | # Any program would do, but since we already have implref-global | |
38 | # specifically for this testcase, might as well use that. | |
5b362f04 | 39 | if [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] { |
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40 | return -1 |
41 | } | |
42 | ||
43 | # Create the DWARF. We need a regular variable and a reference to it that'll | |
44 | # be marked with DW_OP_GNU_implicit_pointer. The variable must be global so | |
45 | # that its name is an exported symbol that we can reference from the DWARF | |
46 | # 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 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 | ||
58 | int_label: DW_TAG_base_type { | |
59 | {DW_AT_byte_size ${int_size} DW_FORM_udata} | |
60 | {DW_AT_encoding @DW_ATE_signed} | |
61 | {DW_AT_name "int"} | |
62 | } | |
63 | ||
64 | ref_label: DW_TAG_reference_type { | |
65 | {DW_AT_byte_size ${addr_size} DW_FORM_udata} | |
66 | {DW_AT_type :${int_label}} | |
67 | } | |
68 | ||
69 | variable_label: DW_TAG_variable { | |
70 | {DW_AT_name "global_var"} | |
71 | {DW_AT_type :${int_label}} | |
72 | {DW_AT_external 1 DW_FORM_flag} | |
73 | {DW_AT_location {DW_OP_addr [gdb_target_symbol "global_var"]} SPECIAL_expr} | |
74 | } | |
75 | ||
76 | DW_TAG_subprogram { | |
10da644d | 77 | {MACRO_AT_func { "main" }} |
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78 | {DW_AT_type :${int_label}} |
79 | {DW_AT_external 1 DW_FORM_flag} | |
80 | } { | |
81 | DW_TAG_variable { | |
82 | {DW_AT_name "ref"} | |
83 | {DW_AT_type :${ref_label}} | |
84 | {DW_AT_location {DW_OP_GNU_implicit_pointer ${variable_label} 0} SPECIAL_expr} | |
85 | } | |
86 | } | |
87 | } | |
88 | } | |
89 | } | |
90 | ||
5b362f04 | 91 | if [prepare_for_testing "failed to prepare" ${executable} [list ${asm_file} ${srcfile}] {}] { |
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92 | return -1 |
93 | } | |
94 | ||
95 | # DW_OP_GNU_implicit_pointer implementation requires a valid frame. | |
96 | if ![runto_main] { | |
97 | return -1 | |
98 | } | |
99 | ||
100 | # Address of the referenced value. | |
101 | set address [get_hexadecimal_valueof "&global_var" ""] | |
102 | ||
103 | # Doing 'print ref' should show us e.g. '(int &) @0xdeadbeef: 42'. | |
104 | gdb_test "print ref" " = \\(int &\\) @${address}: \\\d+" | |
105 | ||
106 | # Doing 'print &ref' should show us e.g. '(int *) 0xdeadbeef <global_var>'. | |
107 | gdb_test "print &ref" " = \\(int \\*\\) ${address} <global_var>" | |
108 | ||
109 | # gdb assumes C++ references are implemented as pointers, and print &(&ref) | |
110 | # shows us the underlying pointer's address. Since in this case there's no | |
111 | # physical pointer, gdb should tell us so. | |
112 | gdb_test "print &(&ref)" "Attempt to take address of value not located in memory." | |
113 | ||
114 | # Test assignment through the synthetic reference. | |
115 | set new_value 10 | |
116 | gdb_test_no_output "set (ref = ${new_value})" | |
117 | gdb_test "print ref" " = \\(int &\\) @${address}: ${new_value}" "print ref after assignment" | |
118 | gdb_test "print global_var" " = ${new_value}" "print global_var after assignment" |