1# int foo() { return 0; } 2# int main() { return foo(); } 3# clang++ -ffunction-sections -g2 -gdwarf-4 -gsplit-dwarf -S main.cpp 4 5 .text 6 .file "main.cpp" 7 .section .text._Z3foov,"ax",@progbits 8 .globl _Z3foov # -- Begin function _Z3foov 9 .p2align 4, 0x90 10 .type _Z3foov,@function 11_Z3foov: # @_Z3foov 12.Lfunc_begin0: 13 .file 1 "." "main.cpp" 14 .loc 1 1 0 # main.cpp:1:0 15 .cfi_startproc 16# %bb.0: # %entry 17 pushq %rbp 18 .cfi_def_cfa_offset 16 19 .cfi_offset %rbp, -16 20 movq %rsp, %rbp 21 .cfi_def_cfa_register %rbp 22.Ltmp0: 23 .loc 1 1 13 prologue_end # main.cpp:1:13 24 xorl %eax, %eax 25 .loc 1 1 13 epilogue_begin is_stmt 0 # main.cpp:1:13 26 popq %rbp 27 .cfi_def_cfa %rsp, 8 28 retq 29.Ltmp1: 30.Lfunc_end0: 31 .size _Z3foov, .Lfunc_end0-_Z3foov 32 .cfi_endproc 33 # -- End function 34 .section .text.main,"ax",@progbits 35 .globl main # -- Begin function main 36 .p2align 4, 0x90 37 .type main,@function 38main: # @main 39.Lfunc_begin1: 40 .loc 1 2 0 is_stmt 1 # main.cpp:2:0 41 .cfi_startproc 42# %bb.0: # %entry 43 pushq %rbp 44 .cfi_def_cfa_offset 16 45 .cfi_offset %rbp, -16 46 movq %rsp, %rbp 47 .cfi_def_cfa_register %rbp 48 subq $16, %rsp 49 movl $0, -4(%rbp) 50.Ltmp2: 51 .loc 1 2 21 prologue_end # main.cpp:2:21 52 callq _Z3foov 53 .loc 1 2 14 epilogue_begin is_stmt 0 # main.cpp:2:14 54 addq $16, %rsp 55 popq %rbp 56 .cfi_def_cfa %rsp, 8 57 retq 58.Ltmp3: 59.Lfunc_end1: 60 .size main, .Lfunc_end1-main 61 .cfi_endproc 62 # -- End function 63 .section .debug_abbrev,"",@progbits 64 .byte 1 # Abbreviation Code 65 .byte 17 # DW_TAG_compile_unit 66 .byte 0 # DW_CHILDREN_no 67 .byte 16 # DW_AT_stmt_list 68 .byte 23 # DW_FORM_sec_offset 69 .byte 27 # DW_AT_comp_dir 70 .byte 14 # DW_FORM_strp 71 .ascii "\264B" # DW_AT_GNU_pubnames 72 .byte 25 # DW_FORM_flag_present 73 .ascii "\260B" # DW_AT_GNU_dwo_name 74 .byte 14 # DW_FORM_strp 75 .ascii "\261B" # DW_AT_GNU_dwo_id 76 .byte 7 # DW_FORM_data8 77 .byte 17 # DW_AT_low_pc 78 .byte 1 # DW_FORM_addr 79 .byte 85 # DW_AT_ranges 80 .byte 23 # DW_FORM_sec_offset 81 .ascii "\263B" # DW_AT_GNU_addr_base 82 .byte 23 # DW_FORM_sec_offset 83 .byte 0 # EOM(1) 84 .byte 0 # EOM(2) 85 .byte 0 # EOM(3) 86 .section .debug_info,"",@progbits 87.Lcu_begin0: 88 .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit 89.Ldebug_info_start0: 90 .short 4 # DWARF version number 91 .long .debug_abbrev # Offset Into Abbrev. Section 92 .byte 8 # Address Size (in bytes) 93 .byte 1 # Abbrev [1] 0xb:0x25 DW_TAG_compile_unit 94 .long .Lline_table_start0 # DW_AT_stmt_list 95 .long .Lskel_string0 # DW_AT_comp_dir 96 # DW_AT_GNU_pubnames 97 .long .Lskel_string1 # DW_AT_GNU_dwo_name 98 .quad -252790171939032967 # DW_AT_GNU_dwo_id 99 .quad 0 # DW_AT_low_pc 100 .long .Ldebug_ranges0 # DW_AT_ranges 101 .long .Laddr_table_base0 # DW_AT_GNU_addr_base 102.Ldebug_info_end0: 103 .section .debug_ranges,"",@progbits 104.Ldebug_ranges0: 105 .quad .Lfunc_begin0 106 .quad .Lfunc_end0 107 .quad .Lfunc_begin1 108 .quad .Lfunc_end1 109 .quad 0 110 .quad 0 111 .section .debug_str,"MS",@progbits,1 112.Lskel_string0: 113 .asciz "." # string offset=0 114.Lskel_string1: 115 .asciz "main.dwo" # string offset=58 116 .section .debug_str.dwo,"eMS",@progbits,1 117.Linfo_string0: 118 .asciz "_Z3foov" # string offset=0 119.Linfo_string1: 120 .asciz "foo" # string offset=8 121.Linfo_string2: 122 .asciz "int" # string offset=12 123.Linfo_string3: 124 .asciz "main" # string offset=16 125.Linfo_string4: 126 .asciz "clang version 17.0.0 (https://github.com/llvm/llvm-project.git 640e07c49037cca41a1bfbeb916b569d8c950aea)" # string offset=21 127.Linfo_string5: 128 .asciz "main.cpp" # string offset=126 129.Linfo_string6: 130 .asciz "main.dwo" # string offset=135 131 .section .debug_str_offsets.dwo,"e",@progbits 132 .long 0 133 .long 8 134 .long 12 135 .long 16 136 .long 21 137 .long 126 138 .long 135 139 .section .debug_info.dwo,"e",@progbits 140 .long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit 141.Ldebug_info_dwo_start0: 142 .short 4 # DWARF version number 143 .long 0 # Offset Into Abbrev. Section 144 .byte 8 # Address Size (in bytes) 145 .byte 1 # Abbrev [1] 0xb:0x32 DW_TAG_compile_unit 146 .byte 4 # DW_AT_producer 147 .short 33 # DW_AT_language 148 .byte 5 # DW_AT_name 149 .byte 6 # DW_AT_GNU_dwo_name 150 .quad -252790171939032967 # DW_AT_GNU_dwo_id 151 .byte 2 # Abbrev [2] 0x19:0x10 DW_TAG_subprogram 152 .byte 0 # DW_AT_low_pc 153 .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc 154 .byte 1 # DW_AT_frame_base 155 .byte 86 156 .byte 0 # DW_AT_linkage_name 157 .byte 1 # DW_AT_name 158 .byte 1 # DW_AT_decl_file 159 .byte 1 # DW_AT_decl_line 160 .long 56 # DW_AT_type 161 # DW_AT_external 162 .byte 3 # Abbrev [3] 0x29:0xf DW_TAG_subprogram 163 .byte 1 # DW_AT_low_pc 164 .long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc 165 .byte 1 # DW_AT_frame_base 166 .byte 86 167 .byte 3 # DW_AT_name 168 .byte 1 # DW_AT_decl_file 169 .byte 2 # DW_AT_decl_line 170 .long 56 # DW_AT_type 171 # DW_AT_external 172 .byte 4 # Abbrev [4] 0x38:0x4 DW_TAG_base_type 173 .byte 2 # DW_AT_name 174 .byte 5 # DW_AT_encoding 175 .byte 4 # DW_AT_byte_size 176 .byte 0 # End Of Children Mark 177.Ldebug_info_dwo_end0: 178 .section .debug_abbrev.dwo,"e",@progbits 179 .byte 1 # Abbreviation Code 180 .byte 17 # DW_TAG_compile_unit 181 .byte 1 # DW_CHILDREN_yes 182 .byte 37 # DW_AT_producer 183 .ascii "\202>" # DW_FORM_GNU_str_index 184 .byte 19 # DW_AT_language 185 .byte 5 # DW_FORM_data2 186 .byte 3 # DW_AT_name 187 .ascii "\202>" # DW_FORM_GNU_str_index 188 .ascii "\260B" # DW_AT_GNU_dwo_name 189 .ascii "\202>" # DW_FORM_GNU_str_index 190 .ascii "\261B" # DW_AT_GNU_dwo_id 191 .byte 7 # DW_FORM_data8 192 .byte 0 # EOM(1) 193 .byte 0 # EOM(2) 194 .byte 2 # Abbreviation Code 195 .byte 46 # DW_TAG_subprogram 196 .byte 0 # DW_CHILDREN_no 197 .byte 17 # DW_AT_low_pc 198 .ascii "\201>" # DW_FORM_GNU_addr_index 199 .byte 18 # DW_AT_high_pc 200 .byte 6 # DW_FORM_data4 201 .byte 64 # DW_AT_frame_base 202 .byte 24 # DW_FORM_exprloc 203 .byte 110 # DW_AT_linkage_name 204 .ascii "\202>" # DW_FORM_GNU_str_index 205 .byte 3 # DW_AT_name 206 .ascii "\202>" # DW_FORM_GNU_str_index 207 .byte 58 # DW_AT_decl_file 208 .byte 11 # DW_FORM_data1 209 .byte 59 # DW_AT_decl_line 210 .byte 11 # DW_FORM_data1 211 .byte 73 # DW_AT_type 212 .byte 19 # DW_FORM_ref4 213 .byte 63 # DW_AT_external 214 .byte 25 # DW_FORM_flag_present 215 .byte 0 # EOM(1) 216 .byte 0 # EOM(2) 217 .byte 3 # Abbreviation Code 218 .byte 46 # DW_TAG_subprogram 219 .byte 0 # DW_CHILDREN_no 220 .byte 17 # DW_AT_low_pc 221 .ascii "\201>" # DW_FORM_GNU_addr_index 222 .byte 18 # DW_AT_high_pc 223 .byte 6 # DW_FORM_data4 224 .byte 64 # DW_AT_frame_base 225 .byte 24 # DW_FORM_exprloc 226 .byte 3 # DW_AT_name 227 .ascii "\202>" # DW_FORM_GNU_str_index 228 .byte 58 # DW_AT_decl_file 229 .byte 11 # DW_FORM_data1 230 .byte 59 # DW_AT_decl_line 231 .byte 11 # DW_FORM_data1 232 .byte 73 # DW_AT_type 233 .byte 19 # DW_FORM_ref4 234 .byte 63 # DW_AT_external 235 .byte 25 # DW_FORM_flag_present 236 .byte 0 # EOM(1) 237 .byte 0 # EOM(2) 238 .byte 4 # Abbreviation Code 239 .byte 36 # DW_TAG_base_type 240 .byte 0 # DW_CHILDREN_no 241 .byte 3 # DW_AT_name 242 .ascii "\202>" # DW_FORM_GNU_str_index 243 .byte 62 # DW_AT_encoding 244 .byte 11 # DW_FORM_data1 245 .byte 11 # DW_AT_byte_size 246 .byte 11 # DW_FORM_data1 247 .byte 0 # EOM(1) 248 .byte 0 # EOM(2) 249 .byte 0 # EOM(3) 250 .section .debug_addr,"",@progbits 251.Laddr_table_base0: 252 .quad .Lfunc_begin0 253 .quad .Lfunc_begin1 254 .section .debug_gnu_pubnames,"",@progbits 255 .long .LpubNames_end0-.LpubNames_start0 # Length of Public Names Info 256.LpubNames_start0: 257 .short 2 # DWARF Version 258 .long .Lcu_begin0 # Offset of Compilation Unit Info 259 .long 48 # Compilation Unit Length 260 .long 41 # DIE offset 261 .byte 48 # Attributes: FUNCTION, EXTERNAL 262 .asciz "main" # External Name 263 .long 25 # DIE offset 264 .byte 48 # Attributes: FUNCTION, EXTERNAL 265 .asciz "foo" # External Name 266 .long 0 # End Mark 267.LpubNames_end0: 268 .section .debug_gnu_pubtypes,"",@progbits 269 .long .LpubTypes_end0-.LpubTypes_start0 # Length of Public Types Info 270.LpubTypes_start0: 271 .short 2 # DWARF Version 272 .long .Lcu_begin0 # Offset of Compilation Unit Info 273 .long 48 # Compilation Unit Length 274 .long 56 # DIE offset 275 .byte 144 # Attributes: TYPE, STATIC 276 .asciz "int" # External Name 277 .long 0 # End Mark 278.LpubTypes_end0: 279 .ident "clang version 17.0.0 (https://github.com/llvm/llvm-project.git 640e07c49037cca41a1bfbeb916b569d8c950aea)" 280 .section ".note.GNU-stack","",@progbits 281 .addrsig 282 .addrsig_sym _Z3foov 283 .section .debug_line,"",@progbits 284.Lline_table_start0: 285