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61baf725 | 1 | # Copyright 2016-2017 Free Software Foundation, Inc. |
a22df60a 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 | ||
3326303b MG |
16 | # Test a C++ reference marked with DW_OP_GNU_implicit_pointer. |
17 | # The referenced value is a DW_AT_const_value. | |
a22df60a | 18 | |
3326303b MG |
19 | if [skip_cplus_tests] { |
20 | continue | |
21 | } | |
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22 | |
23 | load_lib dwarf.exp | |
24 | ||
25 | # This test can only be run on targets which support DWARF-2 and use gas. | |
3326303b | 26 | if ![dwarf2_support] { |
a22df60a MG |
27 | return 0 |
28 | } | |
29 | ||
3326303b | 30 | # We'll place the output of Dwarf::assemble in implref-const.S. |
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31 | standard_testfile main.c .S |
32 | ||
3326303b | 33 | # ${testfile} is now "implref-const". srcfile2 is "implref-const.S". |
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34 | set executable ${testfile} |
35 | set asm_file [standard_output_file ${srcfile2}] | |
36 | ||
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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-const program. | |
41 | # Any program would do, but since we already have implref-const | |
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 | ||
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47 | # Create the DWARF. We need a regular variable and a reference to it that'll |
48 | # be marked with DW_OP_GNU_implicit_pointer. | |
3326303b | 49 | Dwarf::assemble ${asm_file} { |
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50 | global srcdir subdir srcfile |
51 | ||
3326303b | 52 | cu {} { |
a22df60a | 53 | DW_TAG_compile_unit { |
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54 | {DW_AT_language @DW_LANG_C_plus_plus} |
55 | } { | |
56 | declare_labels int_label const_label variable_label ref_label | |
3326303b MG |
57 | set int_size [get_sizeof "int" -1] |
58 | ||
59 | # gdb always assumes references are implemented as pointers. | |
60 | set addr_size [get_sizeof "void *" -1] | |
61 | set var_value 42 | |
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62 | |
63 | int_label: DW_TAG_base_type { | |
3326303b | 64 | {DW_AT_byte_size ${int_size} DW_FORM_udata} |
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65 | {DW_AT_encoding @DW_ATE_signed} |
66 | {DW_AT_name "int"} | |
67 | } | |
68 | ||
69 | ref_label: DW_TAG_reference_type { | |
3326303b | 70 | {DW_AT_byte_size ${addr_size} DW_FORM_udata} |
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71 | {DW_AT_type :${int_label}} |
72 | } | |
73 | ||
74 | const_label: DW_TAG_const_type { | |
75 | {DW_AT_type :${ref_label}} | |
76 | } | |
77 | ||
78 | DW_TAG_subprogram { | |
79 | {MACRO_AT_func { "main" "${srcdir}/${subdir}/${srcfile}" }} | |
80 | {DW_AT_type :${int_label}} | |
81 | {DW_AT_external 1 DW_FORM_flag} | |
82 | } { | |
83 | variable_label: DW_TAG_variable { | |
84 | {DW_AT_name "var"} | |
85 | {DW_AT_type :${int_label}} | |
3326303b | 86 | {DW_AT_const_value ${var_value} DW_FORM_udata} |
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87 | } |
88 | ||
89 | DW_TAG_variable { | |
90 | {DW_AT_name "ref"} | |
91 | {DW_AT_type :${const_label}} | |
92 | {DW_AT_location {DW_OP_GNU_implicit_pointer ${variable_label} 0} SPECIAL_expr} | |
93 | } | |
94 | } | |
95 | } | |
96 | } | |
97 | } | |
98 | ||
5b362f04 | 99 | if [prepare_for_testing "failed to prepare" ${executable} [list ${asm_file} ${srcfile}] {}] { |
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100 | return -1 |
101 | } | |
102 | ||
103 | # DW_OP_GNU_implicit_pointer implementation requires a valid frame. | |
104 | if ![runto_main] { | |
105 | return -1 | |
106 | } | |
107 | ||
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108 | # Doing 'print ref' should show us e.g. '(int &) <synthetic pointer>: 42'. |
109 | gdb_test "print ref" " = \\(int &\\) <synthetic pointer>: \\\d+" | |
110 | ||
111 | # The variable isn't located in memory, thus we can't take its address. | |
112 | gdb_test "print &var" "Can't take address of \"var\" which isn't an lvalue." | |
113 | gdb_test "print &ref" "Attempt to take address of value not located in memory." | |
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114 | |
115 | # gdb assumes C++ references are implemented as pointers, and print &(&ref) | |
116 | # shows us the underlying pointer's address. | |
117 | # Since in this case there's no physical pointer, gdb should tell us so. | |
3326303b | 118 | gdb_test "print &(&ref)" "Attempt to take address of value not located in memory." |