1# REQUIRES: x86-registered-target 2# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o 3# RUN: llvm-symbolizer 0x0 0x2 0x3 0x4 --obj=%t.o | FileCheck %s 4# This test makes sure we don't attempt to access out of the line table boundaries 5# if the last range is empty. 6# Produced from the following program: 7# int func(int a) { 8# return 1 + a; 9# } 10# compiled with clang -O3 -g -S 11# Edited by adding a redundant, empty last range. 12# The line table (llvm-dwarfdump --debug-line) looks like: 13# 14# Address Line Column File ISA Discriminator OpIndex Flags 15# ------------------ ------ ------ ------ --- ------------- ------- ------------- 16# 0x0000000000000000 1 0 1 0 0 0 is_stmt 17# 0x0000000000000000 2 12 1 0 0 0 is_stmt prologue_end 18# 0x0000000000000003 2 3 1 0 0 0 19# 0x0000000000000003 3 3 1 0 0 0 20# 0x0000000000000004 3 3 1 0 0 0 end_sequence 21# 22# 0x0 should pick the second line in the table - line 2, col 12 23# CHECK: func 24# CHECK: /scratch/a.cpp:2:12 25# 0x2 does not exist in the table, so we should pick the line with a 26# lower address that describes the range - in this case, the second line. 27# CHECK: func 28# CHECK: /scratch/a.cpp:2:12 29# 0x3 also has a sequence of empty ranges, so we should pick the first range after 30# skipping the empty ones. 31# This also verifies we don't attempt to access outside boundaries. 32# CHECK: func 33# CHECK: /scratch/a.cpp:3:3 34# CHECK: ?? 35# CHECK: ??:0:0 36 37 .text 38 .file "a.cpp" 39 .globl _Z4funci # -- Begin function _Z4funci 40 .p2align 4, 0x90 41 .type _Z4funci,@function 42_Z4funci: # @_Z4funci 43.Lfunc_begin0: 44 .file 1 "/llvm-project" "/scratch/a.cpp" 45 .loc 1 1 0 # /scratch/a.cpp:1:0 46 .cfi_startproc 47# %bb.0: 48 #DEBUG_VALUE: func:a <- $edi 49 # kill: def $edi killed $edi def $rdi 50 #DEBUG_VALUE: func:a <- $edi 51 .loc 1 2 12 prologue_end # /scratch/a.cpp:2:12 52 leal 1(%rdi), %eax 53 .loc 1 2 3 # /scratch/a.cpp:2:3 54 .loc 1 3 3 is_stmt 0 # this forms an empty range torgether with the previous. 55 retq 56.Ltmp0: 57.Lfunc_end0: 58 .size _Z4funci, .Lfunc_end0-_Z4funci 59 .cfi_endproc 60 # -- End function 61 .section .debug_str,"MS",@progbits,1 62.Linfo_string0: 63 .asciz "clang version 7.0.1-6 (tags/RELEASE_701/final)" # string offset=0 64.Linfo_string1: 65 .asciz "/scratch/a.cpp" # string offset=47 66.Linfo_string2: 67 .asciz "/llvm-project" # string offset=97 68.Linfo_string3: 69 .asciz "_Z4funci" # string offset=146 70.Linfo_string4: 71 .asciz "func" # string offset=155 72.Linfo_string5: 73 .asciz "int" # string offset=160 74.Linfo_string6: 75 .asciz "a" # string offset=164 76 .section .debug_loc,"",@progbits 77.Ldebug_loc0: 78 .quad .Lfunc_begin0-.Lfunc_begin0 79 .quad .Lfunc_end0-.Lfunc_begin0 80 .short 1 # Loc expr size 81 .byte 85 # super-register DW_OP_reg5 82 .quad 0 83 .quad 0 84 .section .debug_abbrev,"",@progbits 85 .byte 1 # Abbreviation Code 86 .byte 17 # DW_TAG_compile_unit 87 .byte 1 # DW_CHILDREN_yes 88 .byte 37 # DW_AT_producer 89 .byte 14 # DW_FORM_strp 90 .byte 19 # DW_AT_language 91 .byte 5 # DW_FORM_data2 92 .byte 3 # DW_AT_name 93 .byte 14 # DW_FORM_strp 94 .byte 16 # DW_AT_stmt_list 95 .byte 23 # DW_FORM_sec_offset 96 .byte 27 # DW_AT_comp_dir 97 .byte 14 # DW_FORM_strp 98 .ascii "\264B" # DW_AT_GNU_pubnames 99 .byte 25 # DW_FORM_flag_present 100 .byte 17 # DW_AT_low_pc 101 .byte 1 # DW_FORM_addr 102 .byte 18 # DW_AT_high_pc 103 .byte 6 # DW_FORM_data4 104 .byte 0 # EOM(1) 105 .byte 0 # EOM(2) 106 .byte 2 # Abbreviation Code 107 .byte 46 # DW_TAG_subprogram 108 .byte 1 # DW_CHILDREN_yes 109 .byte 17 # DW_AT_low_pc 110 .byte 1 # DW_FORM_addr 111 .byte 18 # DW_AT_high_pc 112 .byte 6 # DW_FORM_data4 113 .byte 64 # DW_AT_frame_base 114 .byte 24 # DW_FORM_exprloc 115 .byte 110 # DW_AT_linkage_name 116 .byte 14 # DW_FORM_strp 117 .byte 3 # DW_AT_name 118 .byte 14 # DW_FORM_strp 119 .byte 58 # DW_AT_decl_file 120 .byte 11 # DW_FORM_data1 121 .byte 59 # DW_AT_decl_line 122 .byte 11 # DW_FORM_data1 123 .byte 73 # DW_AT_type 124 .byte 19 # DW_FORM_ref4 125 .byte 63 # DW_AT_external 126 .byte 25 # DW_FORM_flag_present 127 .byte 0 # EOM(1) 128 .byte 0 # EOM(2) 129 .byte 3 # Abbreviation Code 130 .byte 5 # DW_TAG_formal_parameter 131 .byte 0 # DW_CHILDREN_no 132 .byte 2 # DW_AT_location 133 .byte 23 # DW_FORM_sec_offset 134 .byte 3 # DW_AT_name 135 .byte 14 # DW_FORM_strp 136 .byte 58 # DW_AT_decl_file 137 .byte 11 # DW_FORM_data1 138 .byte 59 # DW_AT_decl_line 139 .byte 11 # DW_FORM_data1 140 .byte 73 # DW_AT_type 141 .byte 19 # DW_FORM_ref4 142 .byte 0 # EOM(1) 143 .byte 0 # EOM(2) 144 .byte 4 # Abbreviation Code 145 .byte 36 # DW_TAG_base_type 146 .byte 0 # DW_CHILDREN_no 147 .byte 3 # DW_AT_name 148 .byte 14 # DW_FORM_strp 149 .byte 62 # DW_AT_encoding 150 .byte 11 # DW_FORM_data1 151 .byte 11 # DW_AT_byte_size 152 .byte 11 # DW_FORM_data1 153 .byte 0 # EOM(1) 154 .byte 0 # EOM(2) 155 .byte 0 # EOM(3) 156 .section .debug_info,"",@progbits 157.Lcu_begin0: 158 .long 91 # Length of Unit 159 .short 4 # DWARF version number 160 .long .debug_abbrev # Offset Into Abbrev. Section 161 .byte 8 # Address Size (in bytes) 162 .byte 1 # Abbrev [1] 0xb:0x54 DW_TAG_compile_unit 163 .long .Linfo_string0 # DW_AT_producer 164 .short 4 # DW_AT_language 165 .long .Linfo_string1 # DW_AT_name 166 .long .Lline_table_start0 # DW_AT_stmt_list 167 .long .Linfo_string2 # DW_AT_comp_dir 168 # DW_AT_GNU_pubnames 169 .quad .Lfunc_begin0 # DW_AT_low_pc 170 .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc 171 .byte 2 # Abbrev [2] 0x2a:0x2d DW_TAG_subprogram 172 .quad .Lfunc_begin0 # DW_AT_low_pc 173 .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc 174 .byte 1 # DW_AT_frame_base 175 .byte 87 176 .long .Linfo_string3 # DW_AT_linkage_name 177 .long .Linfo_string4 # DW_AT_name 178 .byte 1 # DW_AT_decl_file 179 .byte 1 # DW_AT_decl_line 180 .long 87 # DW_AT_type 181 # DW_AT_external 182 .byte 3 # Abbrev [3] 0x47:0xf DW_TAG_formal_parameter 183 .long .Ldebug_loc0 # DW_AT_location 184 .long .Linfo_string6 # DW_AT_name 185 .byte 1 # DW_AT_decl_file 186 .byte 1 # DW_AT_decl_line 187 .long 87 # DW_AT_type 188 .byte 0 # End Of Children Mark 189 .byte 4 # Abbrev [4] 0x57:0x7 DW_TAG_base_type 190 .long .Linfo_string5 # DW_AT_name 191 .byte 5 # DW_AT_encoding 192 .byte 4 # DW_AT_byte_size 193 .byte 0 # End Of Children Mark 194 .section .debug_macinfo,"",@progbits 195 .byte 0 # End Of Macro List Mark 196 .section .debug_pubnames,"",@progbits 197 .long .LpubNames_end0-.LpubNames_begin0 # Length of Public Names Info 198.LpubNames_begin0: 199 .short 2 # DWARF Version 200 .long .Lcu_begin0 # Offset of Compilation Unit Info 201 .long 95 # Compilation Unit Length 202 .long 42 # DIE offset 203 .asciz "func" # External Name 204 .long 0 # End Mark 205.LpubNames_end0: 206 .section .debug_pubtypes,"",@progbits 207 .long .LpubTypes_end0-.LpubTypes_begin0 # Length of Public Types Info 208.LpubTypes_begin0: 209 .short 2 # DWARF Version 210 .long .Lcu_begin0 # Offset of Compilation Unit Info 211 .long 95 # Compilation Unit Length 212 .long 87 # DIE offset 213 .asciz "int" # External Name 214 .long 0 # End Mark 215.LpubTypes_end0: 216 217 .ident "clang version 7.0.1-6 (tags/RELEASE_701/final)" 218 .section ".note.GNU-stack","",@progbits 219 .addrsig 220 .section .debug_line,"",@progbits 221.Lline_table_start0: 222