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1# Source (tiny.cc):2# void a() {}3# void b() {}4# int main(int argc, char** argv) {5# void(*ptr)();6# if (argc == 1)7# ptr = &a;8# else9# ptr = &b;10# ptr();11# }12# Compile with:13# clang++ -g tiny.cc -S -o tiny.s14 15 .text16 .file "tiny.cc"17 .globl _Z1av # -- Begin function _Z1av18 .p2align 4, 0x9019 .type _Z1av,@function20_Z1av: # @_Z1av21.Lfunc_begin0:22 .file 1 "tiny.cc"23 .loc 1 1 0 # tiny.cc:1:024 .cfi_startproc25# %bb.0:26 pushq %rbp27 .cfi_def_cfa_offset 1628 .cfi_offset %rbp, -1629 movq %rsp, %rbp30 .cfi_def_cfa_register %rbp31.Ltmp0:32 .loc 1 1 11 prologue_end # tiny.cc:1:1133 popq %rbp34 .cfi_def_cfa %rsp, 835 retq36.Ltmp1:37.Lfunc_end0:38 .size _Z1av, .Lfunc_end0-_Z1av39 .cfi_endproc40 # -- End function41 .globl _Z1bv # -- Begin function _Z1bv42 .p2align 4, 0x9043 .type _Z1bv,@function44_Z1bv: # @_Z1bv45.Lfunc_begin1:46 .loc 1 2 0 # tiny.cc:2:047 .cfi_startproc48# %bb.0:49 pushq %rbp50 .cfi_def_cfa_offset 1651 .cfi_offset %rbp, -1652 movq %rsp, %rbp53 .cfi_def_cfa_register %rbp54.Ltmp2:55 .loc 1 2 11 prologue_end # tiny.cc:2:1156 popq %rbp57 .cfi_def_cfa %rsp, 858 retq59.Ltmp3:60.Lfunc_end1:61 .size _Z1bv, .Lfunc_end1-_Z1bv62 .cfi_endproc63 # -- End function64 .globl main # -- Begin function main65 .p2align 4, 0x9066 .type main,@function67main: # @main68.Lfunc_begin2:69 .loc 1 4 0 # tiny.cc:4:070 .cfi_startproc71# %bb.0:72 pushq %rbp73 .cfi_def_cfa_offset 1674 .cfi_offset %rbp, -1675 movq %rsp, %rbp76 .cfi_def_cfa_register %rbp77 subq $32, %rsp78 movl $0, -4(%rbp)79 movl %edi, -8(%rbp)80 movq %rsi, -16(%rbp)81.Ltmp4:82 .loc 1 6 12 prologue_end # tiny.cc:6:1283 cmpl $1, -8(%rbp)84.Ltmp5:85 .loc 1 6 7 is_stmt 0 # tiny.cc:6:786 jne .LBB2_287# %bb.1:88 .loc 1 0 7 # tiny.cc:0:789 movabsq $_Z1av, %rax90.Ltmp6:91 .loc 1 7 9 is_stmt 1 # tiny.cc:7:992 movq %rax, -24(%rbp)93 .loc 1 7 5 is_stmt 0 # tiny.cc:7:594 jmp .LBB2_395.LBB2_2:96 .loc 1 0 5 # tiny.cc:0:597 movabsq $_Z1bv, %rax98 .loc 1 9 9 is_stmt 1 # tiny.cc:9:999 movq %rax, -24(%rbp)100.Ltmp7:101.LBB2_3:102 .loc 1 11 3 # tiny.cc:11:3103 callq *-24(%rbp)104 .loc 1 12 1 # tiny.cc:12:1105 movl -4(%rbp), %eax106 addq $32, %rsp107 popq %rbp108 .cfi_def_cfa %rsp, 8109 retq110.Ltmp8:111.Lfunc_end2:112 .size main, .Lfunc_end2-main113 .cfi_endproc114 # -- End function115 .section .debug_str,"MS",@progbits,1116.Linfo_string0:117 .asciz "clang version 6.0.0 (trunk 317104)" # string offset=0118.Linfo_string1:119 .asciz "tiny.cc" # string offset=35120.Linfo_string2:121 .asciz "/tmp/a/b" # string offset=43122.Linfo_string3:123 .asciz "_Z1av" # string offset=52124.Linfo_string4:125 .asciz "a" # string offset=58126.Linfo_string5:127 .asciz "_Z1bv" # string offset=60128.Linfo_string6:129 .asciz "b" # string offset=66130.Linfo_string7:131 .asciz "main" # string offset=68132.Linfo_string8:133 .asciz "int" # string offset=73134.Linfo_string9:135 .asciz "argc" # string offset=77136.Linfo_string10:137 .asciz "argv" # string offset=82138.Linfo_string11:139 .asciz "char" # string offset=87140.Linfo_string12:141 .asciz "ptr" # string offset=92142 .section .debug_abbrev,"",@progbits143 .byte 1 # Abbreviation Code144 .byte 17 # DW_TAG_compile_unit145 .byte 1 # DW_CHILDREN_yes146 .byte 37 # DW_AT_producer147 .byte 14 # DW_FORM_strp148 .byte 19 # DW_AT_language149 .byte 5 # DW_FORM_data2150 .byte 3 # DW_AT_name151 .byte 14 # DW_FORM_strp152 .byte 16 # DW_AT_stmt_list153 .byte 23 # DW_FORM_sec_offset154 .byte 27 # DW_AT_comp_dir155 .byte 14 # DW_FORM_strp156 .ascii "\264B" # DW_AT_GNU_pubnames157 .byte 25 # DW_FORM_flag_present158 .byte 17 # DW_AT_low_pc159 .byte 1 # DW_FORM_addr160 .byte 18 # DW_AT_high_pc161 .byte 6 # DW_FORM_data4162 .byte 0 # EOM(1)163 .byte 0 # EOM(2)164 .byte 2 # Abbreviation Code165 .byte 46 # DW_TAG_subprogram166 .byte 0 # DW_CHILDREN_no167 .byte 17 # DW_AT_low_pc168 .byte 1 # DW_FORM_addr169 .byte 18 # DW_AT_high_pc170 .byte 6 # DW_FORM_data4171 .byte 64 # DW_AT_frame_base172 .byte 24 # DW_FORM_exprloc173 .byte 110 # DW_AT_linkage_name174 .byte 14 # DW_FORM_strp175 .byte 3 # DW_AT_name176 .byte 14 # DW_FORM_strp177 .byte 58 # DW_AT_decl_file178 .byte 11 # DW_FORM_data1179 .byte 59 # DW_AT_decl_line180 .byte 11 # DW_FORM_data1181 .byte 63 # DW_AT_external182 .byte 25 # DW_FORM_flag_present183 .byte 0 # EOM(1)184 .byte 0 # EOM(2)185 .byte 3 # Abbreviation Code186 .byte 46 # DW_TAG_subprogram187 .byte 1 # DW_CHILDREN_yes188 .byte 17 # DW_AT_low_pc189 .byte 1 # DW_FORM_addr190 .byte 18 # DW_AT_high_pc191 .byte 6 # DW_FORM_data4192 .byte 64 # DW_AT_frame_base193 .byte 24 # DW_FORM_exprloc194 .byte 3 # DW_AT_name195 .byte 14 # DW_FORM_strp196 .byte 58 # DW_AT_decl_file197 .byte 11 # DW_FORM_data1198 .byte 59 # DW_AT_decl_line199 .byte 11 # DW_FORM_data1200 .byte 73 # DW_AT_type201 .byte 19 # DW_FORM_ref4202 .byte 63 # DW_AT_external203 .byte 25 # DW_FORM_flag_present204 .byte 0 # EOM(1)205 .byte 0 # EOM(2)206 .byte 4 # Abbreviation Code207 .byte 5 # DW_TAG_formal_parameter208 .byte 0 # DW_CHILDREN_no209 .byte 2 # DW_AT_location210 .byte 24 # DW_FORM_exprloc211 .byte 3 # DW_AT_name212 .byte 14 # DW_FORM_strp213 .byte 58 # DW_AT_decl_file214 .byte 11 # DW_FORM_data1215 .byte 59 # DW_AT_decl_line216 .byte 11 # DW_FORM_data1217 .byte 73 # DW_AT_type218 .byte 19 # DW_FORM_ref4219 .byte 0 # EOM(1)220 .byte 0 # EOM(2)221 .byte 5 # Abbreviation Code222 .byte 52 # DW_TAG_variable223 .byte 0 # DW_CHILDREN_no224 .byte 2 # DW_AT_location225 .byte 24 # DW_FORM_exprloc226 .byte 3 # DW_AT_name227 .byte 14 # DW_FORM_strp228 .byte 58 # DW_AT_decl_file229 .byte 11 # DW_FORM_data1230 .byte 59 # DW_AT_decl_line231 .byte 11 # DW_FORM_data1232 .byte 73 # DW_AT_type233 .byte 19 # DW_FORM_ref4234 .byte 0 # EOM(1)235 .byte 0 # EOM(2)236 .byte 6 # Abbreviation Code237 .byte 36 # DW_TAG_base_type238 .byte 0 # DW_CHILDREN_no239 .byte 3 # DW_AT_name240 .byte 14 # DW_FORM_strp241 .byte 62 # DW_AT_encoding242 .byte 11 # DW_FORM_data1243 .byte 11 # DW_AT_byte_size244 .byte 11 # DW_FORM_data1245 .byte 0 # EOM(1)246 .byte 0 # EOM(2)247 .byte 7 # Abbreviation Code248 .byte 15 # DW_TAG_pointer_type249 .byte 0 # DW_CHILDREN_no250 .byte 73 # DW_AT_type251 .byte 19 # DW_FORM_ref4252 .byte 0 # EOM(1)253 .byte 0 # EOM(2)254 .byte 8 # Abbreviation Code255 .byte 21 # DW_TAG_subroutine_type256 .byte 0 # DW_CHILDREN_no257 .byte 0 # EOM(1)258 .byte 0 # EOM(2)259 .byte 0 # EOM(3)260 .section .debug_info,"",@progbits261.Lcu_begin0:262 .long 187 # Length of Unit263 .short 4 # DWARF version number264 .long .debug_abbrev # Offset Into Abbrev. Section265 .byte 8 # Address Size (in bytes)266 .byte 1 # Abbrev [1] 0xb:0xb4 DW_TAG_compile_unit267 .long .Linfo_string0 # DW_AT_producer268 .short 4 # DW_AT_language269 .long .Linfo_string1 # DW_AT_name270 .long .Lline_table_start0 # DW_AT_stmt_list271 .long .Linfo_string2 # DW_AT_comp_dir272 # DW_AT_GNU_pubnames273 .quad .Lfunc_begin0 # DW_AT_low_pc274 .long .Lfunc_end2-.Lfunc_begin0 # DW_AT_high_pc275 .byte 2 # Abbrev [2] 0x2a:0x19 DW_TAG_subprogram276 .quad .Lfunc_begin0 # DW_AT_low_pc277 .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc278 .byte 1 # DW_AT_frame_base279 .byte 86280 .long .Linfo_string3 # DW_AT_linkage_name281 .long .Linfo_string4 # DW_AT_name282 .byte 1 # DW_AT_decl_file283 .byte 1 # DW_AT_decl_line284 # DW_AT_external285 .byte 2 # Abbrev [2] 0x43:0x19 DW_TAG_subprogram286 .quad .Lfunc_begin1 # DW_AT_low_pc287 .long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc288 .byte 1 # DW_AT_frame_base289 .byte 86290 .long .Linfo_string5 # DW_AT_linkage_name291 .long .Linfo_string6 # DW_AT_name292 .byte 1 # DW_AT_decl_file293 .byte 2 # DW_AT_decl_line294 # DW_AT_external295 .byte 3 # Abbrev [3] 0x5c:0x44 DW_TAG_subprogram296 .quad .Lfunc_begin2 # DW_AT_low_pc297 .long .Lfunc_end2-.Lfunc_begin2 # DW_AT_high_pc298 .byte 1 # DW_AT_frame_base299 .byte 86300 .long .Linfo_string7 # DW_AT_name301 .byte 1 # DW_AT_decl_file302 .byte 4 # DW_AT_decl_line303 .long 160 # DW_AT_type304 # DW_AT_external305 .byte 4 # Abbrev [4] 0x75:0xe DW_TAG_formal_parameter306 .byte 2 # DW_AT_location307 .byte 145308 .byte 120309 .long .Linfo_string9 # DW_AT_name310 .byte 1 # DW_AT_decl_file311 .byte 4 # DW_AT_decl_line312 .long 160 # DW_AT_type313 .byte 4 # Abbrev [4] 0x83:0xe DW_TAG_formal_parameter314 .byte 2 # DW_AT_location315 .byte 145316 .byte 112317 .long .Linfo_string10 # DW_AT_name318 .byte 1 # DW_AT_decl_file319 .byte 4 # DW_AT_decl_line320 .long 167 # DW_AT_type321 .byte 5 # Abbrev [5] 0x91:0xe DW_TAG_variable322 .byte 2 # DW_AT_location323 .byte 145324 .byte 104325 .long .Linfo_string12 # DW_AT_name326 .byte 1 # DW_AT_decl_file327 .byte 5 # DW_AT_decl_line328 .long 184 # DW_AT_type329 .byte 0 # End Of Children Mark330 .byte 6 # Abbrev [6] 0xa0:0x7 DW_TAG_base_type331 .long .Linfo_string8 # DW_AT_name332 .byte 5 # DW_AT_encoding333 .byte 4 # DW_AT_byte_size334 .byte 7 # Abbrev [7] 0xa7:0x5 DW_TAG_pointer_type335 .long 172 # DW_AT_type336 .byte 7 # Abbrev [7] 0xac:0x5 DW_TAG_pointer_type337 .long 177 # DW_AT_type338 .byte 6 # Abbrev [6] 0xb1:0x7 DW_TAG_base_type339 .long .Linfo_string11 # DW_AT_name340 .byte 6 # DW_AT_encoding341 .byte 1 # DW_AT_byte_size342 .byte 7 # Abbrev [7] 0xb8:0x5 DW_TAG_pointer_type343 .long 189 # DW_AT_type344 .byte 8 # Abbrev [8] 0xbd:0x1 DW_TAG_subroutine_type345 .byte 0 # End Of Children Mark346 .section .debug_ranges,"",@progbits347 .section .debug_macinfo,"",@progbits348.Lcu_macro_begin0:349 .byte 0 # End Of Macro List Mark350 .section .debug_pubnames,"",@progbits351 .long .LpubNames_end0-.LpubNames_begin0 # Length of Public Names Info352.LpubNames_begin0:353 .short 2 # DWARF Version354 .long .Lcu_begin0 # Offset of Compilation Unit Info355 .long 191 # Compilation Unit Length356 .long 42 # DIE offset357 .asciz "a" # External Name358 .long 67 # DIE offset359 .asciz "b" # External Name360 .long 92 # DIE offset361 .asciz "main" # External Name362 .long 0 # End Mark363.LpubNames_end0:364 .section .debug_pubtypes,"",@progbits365 .long .LpubTypes_end0-.LpubTypes_begin0 # Length of Public Types Info366.LpubTypes_begin0:367 .short 2 # DWARF Version368 .long .Lcu_begin0 # Offset of Compilation Unit Info369 .long 191 # Compilation Unit Length370 .long 160 # DIE offset371 .asciz "int" # External Name372 .long 177 # DIE offset373 .asciz "char" # External Name374 .long 0 # End Mark375.LpubTypes_end0:376 377 .ident "clang version 6.0.0 (trunk 317104)"378 .section ".note.GNU-stack","",@progbits379 .section .debug_line,"",@progbits380.Lline_table_start0:381