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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
| # REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux -dwarf-version=5 %s -o %t.o
# RUN: not ld.lld %t.o -o %t1 2>&1 | FileCheck %s
# When compiling with -ffunction-sections, .debug_line may contain descriptions
# of locations from the different text sections. Until relocated such
# descriptions might contain overlapping offsets. Check LLD is able to report
# the error locations correctly in this case.
# CHECK: error: undefined symbol: foo()
# CHECK-NEXT: >>> referenced by test.cpp:2
# CHECK-NEXT: >>> {{.*}}.o:(bar())
# CHECK-NEXT: >>> referenced by test.cpp:3
# CHECK-NEXT: >>> {{.*}}.o:(baz())
# The code below is the reduced version of the output
# from the following invocation and source:
#
# // test.cpp:
# int foo();
# int bar() { return foo(); }
# int baz() { return foo(); }
#
# clang -gdwarf-5 -ffunction-sections test.cpp -o test.s -S
.text
.file "test.cpp"
.section .text._Z3barv,"ax",@progbits
.globl _Z3barv
.type _Z3barv,@function
_Z3barv:
.Lfunc_begin0:
.file 0 "/path" "test.cpp" md5 0x9ff11a8404ab4d032ee2dd4f5f8c4140
.loc 0 2 0 # test.cpp:2:0
.loc 0 2 20 prologue_end # test.cpp:2:20
callq _Z3foov
.loc 0 2 13 is_stmt 0 # test.cpp:2:13
.Lfunc_end0:
.size _Z3barv, .Lfunc_end0-_Z3barv
# -- End function
.section .text._Z3bazv,"ax",@progbits
.globl _Z3bazv # -- Begin function _Z3bazv
.type _Z3bazv,@function
_Z3bazv: # @_Z3bazv
.Lfunc_begin1:
.loc 0 3 0 is_stmt 1 # test.cpp:3:0
.loc 0 3 20 prologue_end # test.cpp:3:20
callq _Z3foov
.loc 0 3 13 is_stmt 0 # test.cpp:3:13
.Lfunc_end1:
.size _Z3bazv, .Lfunc_end1-_Z3bazv
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "stub"
.section .debug_str_offsets,"",@progbits
.long 8
.short 5
.short 0
.Lstr_offsets_base0:
.long .Linfo_string0
.section .debug_abbrev,"",@progbits
.byte 1 # Abbreviation Code
.byte 17 # DW_TAG_compile_unit
.byte 1 # DW_CHILDREN_yes
.byte 37 # DW_AT_producer
.byte 37 # DW_FORM_strx1
.byte 19 # DW_AT_language
.byte 5 # DW_FORM_data2
.byte 3 # DW_AT_name
.byte 37 # DW_FORM_strx1
.byte 114 # DW_AT_str_offsets_base
.byte 23 # DW_FORM_sec_offset
.byte 16 # DW_AT_stmt_list
.byte 23 # DW_FORM_sec_offset
.byte 27 # DW_AT_comp_dir
.byte 37 # DW_FORM_strx1
.byte 115 # DW_AT_addr_base
.byte 23 # DW_FORM_sec_offset
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 85 # DW_AT_ranges
.byte 35 # DW_FORM_rnglistx
.byte 116 # DW_AT_rnglists_base
.byte 23 # DW_FORM_sec_offset
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 0 # DW_CHILDREN_no
.byte 17 # DW_AT_low_pc
.byte 27 # DW_FORM_addrx
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.byte 64 # DW_AT_frame_base
.byte 24 # DW_FORM_exprloc
.byte 110 # DW_AT_linkage_name
.byte 37 # DW_FORM_strx1
.byte 3 # DW_AT_name
.byte 37 # DW_FORM_strx1
.byte 58 # DW_AT_decl_file
.byte 11 # DW_FORM_data1
.byte 59 # DW_AT_decl_line
.byte 11 # DW_FORM_data1
.byte 73 # DW_AT_type
.byte 19 # DW_FORM_ref4
.byte 63 # DW_AT_external
.byte 25 # DW_FORM_flag_present
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 3 # Abbreviation Code
.byte 36 # DW_TAG_base_type
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 37 # DW_FORM_strx1
.byte 62 # DW_AT_encoding
.byte 11 # DW_FORM_data1
.byte 11 # DW_AT_byte_size
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
.Ldebug_info_start0:
.short 5 # DWARF version number
.byte 1 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 1 # Abbrev [1] 0xc:0x44 DW_TAG_compile_unit
.byte 0 # DW_AT_producer
.short 4 # DW_AT_language
.byte 0 # DW_AT_name
.long .Lstr_offsets_base0 # DW_AT_str_offsets_base
.long .Lline_table_start0 # DW_AT_stmt_list
.byte 2 # DW_AT_comp_dir
.long 0 # DW_AT_addr_base
.quad 0 # DW_AT_low_pc
.byte 0 # DW_AT_ranges
.long 0 # DW_AT_rnglists_base
.byte 2 # Abbrev [2] 0x2b:0x10 DW_TAG_subprogram
.byte 0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 86
.byte 3 # DW_AT_linkage_name
.byte 0 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 2 # DW_AT_decl_line
.long 75 # DW_AT_type
# DW_AT_external
.byte 2 # Abbrev [2] 0x3b:0x10 DW_TAG_subprogram
.byte 1 # DW_AT_low_pc
.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 86
.byte 6 # DW_AT_linkage_name
.byte 0 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 3 # DW_AT_decl_line
.long 75 # DW_AT_type
# DW_AT_external
.byte 3 # Abbrev [3] 0x4b:0x4 DW_TAG_base_type
.byte 0 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.byte 0 # End Of Children Mark
.Ldebug_info_end0:
.section .debug_line,"",@progbits
.Lline_table_start0:
|