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 # else 9 # ptr = &b; 10 # ptr(); 11 # } 12 # Compile with: 13 # clang++ tiny.cc -S -o tiny.s 14 15 .text 16 .file "tiny.cc" 17 .globl _Z1av # -- Begin function _Z1av 18 .p2align 4, 0x90 19 .type _Z1av,@function 20 _Z1av: # @_Z1av 21 .cfi_startproc 22 # %bb.0: 23 pushq %rbp 24 .cfi_def_cfa_offset 16 25 .cfi_offset %rbp, -16 26 movq %rsp, %rbp 27 .cfi_def_cfa_register %rbp 28 popq %rbp 29 retq 30 .Lfunc_end0: 31 .size _Z1av, .Lfunc_end0-_Z1av 32 .cfi_endproc 33 # -- End function 34 .globl _Z1bv # -- Begin function _Z1bv 35 .p2align 4, 0x90 36 .type _Z1bv,@function 37 _Z1bv: # @_Z1bv 38 .cfi_startproc 39 # %bb.0: 40 pushq %rbp 41 .cfi_def_cfa_offset 16 42 .cfi_offset %rbp, -16 43 movq %rsp, %rbp 44 .cfi_def_cfa_register %rbp 45 popq %rbp 46 retq 47 .Lfunc_end1: 48 .size _Z1bv, .Lfunc_end1-_Z1bv 49 .cfi_endproc 50 # -- End function 51 .globl main # -- Begin function main 52 .p2align 4, 0x90 53 .type main,@function 54 main: # @main 55 .cfi_startproc 56 # %bb.0: 57 pushq %rbp 58 .cfi_def_cfa_offset 16 59 .cfi_offset %rbp, -16 60 movq %rsp, %rbp 61 .cfi_def_cfa_register %rbp 62 subq $32, %rsp 63 movl $0, -4(%rbp) 64 movl %edi, -8(%rbp) 65 movq %rsi, -16(%rbp) 66 cmpl $1, -8(%rbp) 67 jne .LBB2_2 68 # %bb.1: 69 movabsq $_Z1av, %rax 70 movq %rax, -24(%rbp) 71 jmp .LBB2_3 72 .LBB2_2: 73 movabsq $_Z1bv, %rax 74 movq %rax, -24(%rbp) 75 .LBB2_3: 76 callq *-24(%rbp) 77 movl -4(%rbp), %eax 78 addq $32, %rsp 79 popq %rbp 80 retq 81 .Lfunc_end2: 82 .size main, .Lfunc_end2-main 83 .cfi_endproc 84 # -- End function 85 86 .ident "clang version 6.0.0 (trunk 316774)" 87 .section ".note.GNU-stack","",@progbits 88
