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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
# REQUIRES: x86-registered-target
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
# RUN: llvm-symbolizer 0x0 0x2 0x3 0x4 --obj=%t.o | FileCheck %s
# This test makes sure we don't attempt to access out of the line table boundaries
# if the last range is empty.
# Produced from the following program:
# int func(int a) {
# return 1 + a;
# }
# compiled with clang -O3 -g -S
# Edited by adding a redundant, empty last range.
# The line table (llvm-dwarfdump --debug-line) looks like:
#
# Address Line Column File ISA Discriminator Flags
# ------------------ ------ ------ ------ --- ------------- -------------
# 0x0000000000000000 1 0 1 0 0 is_stmt
# 0x0000000000000000 2 12 1 0 0 is_stmt prologue_end
# 0x0000000000000003 2 3 1 0 0
# 0x0000000000000003 3 3 1 0 0
# 0x0000000000000004 3 3 1 0 0 end_sequence
#
# 0x0 should pick the second line in the table - line 2, col 12
# CHECK: func
# CHECK: /scratch/a.cpp:2:12
# 0x2 does not exist in the table, so we should pick the line with a
# lower address that describes the range - in this case, the second line.
# CHECK: func
# CHECK: /scratch/a.cpp:2:12
# 0x3 also has a sequence of empty ranges, so we should pick the first range after
# skipping the empty ones.
# This also verifies we don't attempt to access outside boundaries.
# CHECK: func
# CHECK: /scratch/a.cpp:3:3
# CHECK: ??
# CHECK: ??:0:0
.text
.file "a.cpp"
.globl _Z4funci # -- Begin function _Z4funci
.p2align 4, 0x90
.type _Z4funci,@function
_Z4funci: # @_Z4funci
.Lfunc_begin0:
.file 1 "/llvm-project" "/scratch/a.cpp"
.loc 1 1 0 # /scratch/a.cpp:1:0
.cfi_startproc
# %bb.0:
#DEBUG_VALUE: func:a <- $edi
# kill: def $edi killed $edi def $rdi
#DEBUG_VALUE: func:a <- $edi
.loc 1 2 12 prologue_end # /scratch/a.cpp:2:12
leal 1(%rdi), %eax
.loc 1 2 3 # /scratch/a.cpp:2:3
.loc 1 3 3 is_stmt 0 # this forms an empty range torgether with the previous.
retq
.Ltmp0:
.Lfunc_end0:
.size _Z4funci, .Lfunc_end0-_Z4funci
.cfi_endproc
# -- End function
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "clang version 7.0.1-6 (tags/RELEASE_701/final)" # string offset=0
.Linfo_string1:
.asciz "/scratch/a.cpp" # string offset=47
.Linfo_string2:
.asciz "/llvm-project" # string offset=97
.Linfo_string3:
.asciz "_Z4funci" # string offset=146
.Linfo_string4:
.asciz "func" # string offset=155
.Linfo_string5:
.asciz "int" # string offset=160
.Linfo_string6:
.asciz "a" # string offset=164
.section .debug_loc,"",@progbits
.Ldebug_loc0:
.quad .Lfunc_begin0-.Lfunc_begin0
.quad .Lfunc_end0-.Lfunc_begin0
.short 1 # Loc expr size
.byte 85 # super-register DW_OP_reg5
.quad 0
.quad 0
.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 14 # DW_FORM_strp
.byte 19 # DW_AT_language
.byte 5 # DW_FORM_data2
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.byte 16 # DW_AT_stmt_list
.byte 23 # DW_FORM_sec_offset
.byte 27 # DW_AT_comp_dir
.byte 14 # DW_FORM_strp
.ascii "\264B" # DW_AT_GNU_pubnames
.byte 25 # DW_FORM_flag_present
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 18 # DW_AT_high_pc
.byte 6 # DW_FORM_data4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 1 # DW_CHILDREN_yes
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.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 14 # DW_FORM_strp
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 5 # DW_TAG_formal_parameter
.byte 0 # DW_CHILDREN_no
.byte 2 # DW_AT_location
.byte 23 # DW_FORM_sec_offset
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 0 # EOM(1)
.byte 0 # EOM(2)
.byte 4 # Abbreviation Code
.byte 36 # DW_TAG_base_type
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 91 # Length of Unit
.short 4 # DWARF version number
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 8 # Address Size (in bytes)
.byte 1 # Abbrev [1] 0xb:0x54 DW_TAG_compile_unit
.long .Linfo_string0 # DW_AT_producer
.short 4 # DW_AT_language
.long .Linfo_string1 # DW_AT_name
.long .Lline_table_start0 # DW_AT_stmt_list
.long .Linfo_string2 # DW_AT_comp_dir
# DW_AT_GNU_pubnames
.quad .Lfunc_begin0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.byte 2 # Abbrev [2] 0x2a:0x2d DW_TAG_subprogram
.quad .Lfunc_begin0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 87
.long .Linfo_string3 # DW_AT_linkage_name
.long .Linfo_string4 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 87 # DW_AT_type
# DW_AT_external
.byte 3 # Abbrev [3] 0x47:0xf DW_TAG_formal_parameter
.long .Ldebug_loc0 # DW_AT_location
.long .Linfo_string6 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 87 # DW_AT_type
.byte 0 # End Of Children Mark
.byte 4 # Abbrev [4] 0x57:0x7 DW_TAG_base_type
.long .Linfo_string5 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.byte 0 # End Of Children Mark
.section .debug_macinfo,"",@progbits
.byte 0 # End Of Macro List Mark
.section .debug_pubnames,"",@progbits
.long .LpubNames_end0-.LpubNames_begin0 # Length of Public Names Info
.LpubNames_begin0:
.short 2 # DWARF Version
.long .Lcu_begin0 # Offset of Compilation Unit Info
.long 95 # Compilation Unit Length
.long 42 # DIE offset
.asciz "func" # External Name
.long 0 # End Mark
.LpubNames_end0:
.section .debug_pubtypes,"",@progbits
.long .LpubTypes_end0-.LpubTypes_begin0 # Length of Public Types Info
.LpubTypes_begin0:
.short 2 # DWARF Version
.long .Lcu_begin0 # Offset of Compilation Unit Info
.long 95 # Compilation Unit Length
.long 87 # DIE offset
.asciz "int" # External Name
.long 0 # End Mark
.LpubTypes_end0:
.ident "clang version 7.0.1-6 (tags/RELEASE_701/final)"
.section ".note.GNU-stack","",@progbits
.addrsig
.section .debug_line,"",@progbits
.Lline_table_start0:
|
