user: 下面的汇编指令对应的C源代码是什么：

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x38,%rsp
  lea    D55(%rip),%r14
  lea    D70(%rip),%r13
  lea    D49(%rip),%r15
  mov    %fs:0x28,%rax
  mov    %rax,0x3028(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rbp
  lea    0x2020(%rsp),%r12
  lea    0x1010(%rsp),%rbx
  call   <initialization@plt>
  lea    D76(%rip),%rdi
  call   <addnode@plt>
  lea    D16(%rip),%rdi
  call   <addnode@plt>
  lea    D6(%rip),%rdi
  call   <addnode@plt>
  lea    D90(%rip),%rdi
  call   <addnode@plt>
  lea    D78(%rip),%rdi
  call   <addnode@plt>
  lea    D46(%rip),%rdi
  call   <addnode@plt>
  lea    D34(%rip),%rdi
  call   <addnode@plt>
  xor    %eax,%eax
  call   <dirs@plt>
  nopl   0x0(%rax)
L25:
  mov    %rbp,%rdi
  movb   $0x0,0x2020(%rsp)
  call   <gets@plt>
  mov    %r14,%rsi
  mov    %rbp,%rdi
  mov    %r12,%rcx
  mov    %rbx,%rdx
  call   <sscanf@plt>
  mov    %r13,%rsi
  mov    %rbx,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L34
  mov    %r15,%rsi
  mov    %rbx,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L23
  lea    D26(%rip),%rsi
  mov    %rbx,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L51
  lea    D102(%rip),%rsi
  mov    %rbx,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L32
  mov    %rbp,%rdi
  call   <system@plt>
  jmp    L25
  nopl   0x0(%rax,%rax,1)
L34:
  mov    %r12,%rdi
  call   <pushd@plt>
  xor    %eax,%eax
  call   <dirs@plt>
  jmp    L25
  nopl   0x0(%rax)
L23:
  lea    D20(%rip),%rdi
  call   <printf@plt>
  jmp    L25
  nopl   0x0(%rax)
L51:
  call   <dirs@plt>
  jmp    L25
  nopw   0x0(%rax,%rax,1)
L32:
  xor    %eax,%eax
  call   <freenode@plt>
  mov    0x3028(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L13
  add    $0x3038,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L13:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: label: D55
data_type: string
name: extract_symbolic_data
arguments: label: D70
data_type: string
name: extract_symbolic_data
arguments: label: D49
data_type: string
name: extract_symbolic_data
arguments: label: D76
data_type: string
name: extract_symbolic_data
arguments: label: D16
data_type: string
name: extract_symbolic_data
arguments: label: D6
data_type: string
name: extract_symbolic_data
arguments: label: D90
data_type: string
name: extract_symbolic_data
arguments: label: D78
data_type: string
name: extract_symbolic_data
arguments: label: D46
data_type: string
name: extract_symbolic_data
arguments: label: D34
data_type: string
name: extract_symbolic_data
arguments: label: D26
data_type: string
name: extract_symbolic_data
arguments: label: D102
data_type: string
name: extract_symbolic_data
arguments: label: D20
data_type: string

tool: D55: %s %s

tool: D70: pushd

tool: D49: popd

tool: D76: /bin

tool: D16: /boot

tool: D6: /etc

tool: D90: /mnt

tool: D78: /tmp

tool: D46: /home

tool: D34: /lib

tool: D26: dirs

tool: D102: exit

tool: D20: unfinished

assistant: ```c
int main() {
  char inputstr[4096 + 1];
  char command[4096 + 1];
  char option[4096 + 1];
  initialization();
  addnode("/bin");
  addnode("/boot");
  addnode("/etc");
  addnode("/mnt");
  addnode("/tmp");
  addnode("/home");
  addnode("/lib");
  dirs();
  for (;;) {
    option[0] = '\0';
    gets(inputstr);
    sscanf(inputstr, "%s %s", command, option);
    if (strcmp(command, "pushd") == 0) {
      pushd(option);
      dirs();
    } else if (strcmp(command, "popd") == 0) {
      printf("unfinished");
    } else if (strcmp(command, "dirs") == 0) {
      dirs();
    } else if (strcmp(command, "exit") == 0) {
      break;
    } else
      system(inputstr);
  }
  freenode();
  return 0;
}
```