user: 下面的汇编指令对应的C源代码是什么：

```asm
<get_pawn_moves_black>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %rsi,%rbp
  mov    %rdx,0x10(%rsp)
  mov    $0x61,%r13d
  jmp    L30
L124:
  mov    $0x36,%edx
  mov    %r12d,%esi
  mov    %rbp,%rdi
  call   <is_occupied@plt>
  test   %eax,%eax
  jne    L35
  mov    $0x35,%edx
  mov    %r12d,%esi
  mov    %rbp,%rdi
  call   <is_occupied@plt>
  test   %eax,%eax
  jne    L35
  push   $0x35
  push   %r12
  mov    $0x37,%r9d
  mov    %r12d,%r8d
  mov    0x20(%rsp),%rcx
  mov    $0x0,%edx
  mov    %rbp,%rsi
  mov    0x18(%rsp),%rdi
  call   <store_move@plt>
  mov    %rax,0x18(%rsp)
  add    $0x10,%rsp
  jmp    L35
L71:
  push   %r14
  push   %r12
  mov    0x28(%rsp),%r9d
  mov    %r12d,%r8d
  mov    0x20(%rsp),%rcx
  mov    $0x0,%edx
  mov    %rbp,%rsi
  mov    0x18(%rsp),%rdi
  call   <store_move@plt>
  mov    %rax,0x18(%rsp)
  add    $0x10,%rsp
  jmp    L163
L183:
  lea    -0x1(%r13),%eax
  mov    %eax,0x1c(%rsp)
  mov    %r14d,%edx
  mov    %eax,%esi
  mov    %rbp,%rdi
  call   <is_occupied@plt>
  mov    %eax,%edx
  mov    %r15d,%eax
  cmp    $0x1,%edx
  jne    L161
  push   %r14
  mov    0x24(%rsp),%eax
  push   %rax
  mov    0x28(%rsp),%r9d
  mov    %r12d,%r8d
  mov    0x20(%rsp),%rcx
  mov    $0x0,%edx
  mov    %rbp,%rsi
  mov    0x18(%rsp),%rdi
  call   <store_move@plt>
  mov    %rax,0x18(%rsp)
  add    $0x10,%rsp
  mov    %r15d,%eax
  jmp    L161
L4:
  add    $0x1,%ebx
  cmp    $0x39,%ebx
  je     L33
L169:
  mov    %ebx,0x18(%rsp)
  mov    %ebx,%edx
  mov    %r12d,%esi
  mov    %rbp,%rdi
  call   <get_piece@plt>
  cmp    $0x70,%al
  jne    L4
  mov    %ebx,%r15d
  cmp    $0x37,%bl
  je     L124
  cmp    $0x31,%bl
  jle    L4
L35:
  lea    -0x1(%rbx),%r14d
  mov    %r14d,%edx
  mov    %r12d,%esi
  mov    %rbp,%rdi
  call   <is_occupied@plt>
  test   %eax,%eax
  je     L71
L163:
  cmp    $0x31,%r15b
  setg   %al
  cmp    $0x61,%r13b
  setg   %dl
  and    %al,%dl
  mov    %edx,%r15d
  jne    L183
L161:
  cmp    $0x67,%r13b
  jg     L4
  test   %al,%al
  je     L4
  lea    -0x1(%rbx),%r15d
  lea    0x1(%r13),%r14d
  mov    %r15d,%edx
  mov    %r14d,%esi
  mov    %rbp,%rdi
  call   <is_occupied@plt>
  cmp    $0x1,%eax
  jne    L4
  push   %r15
  push   %r14
  mov    0x28(%rsp),%r9d
  mov    %r12d,%r8d
  mov    0x20(%rsp),%rcx
  mov    $0x0,%edx
  mov    %rbp,%rsi
  mov    0x18(%rsp),%rdi
  call   <store_move@plt>
  mov    %rax,0x18(%rsp)
  add    $0x10,%rsp
  jmp    L4
L33:
  add    $0x1,%r13d
  cmp    $0x69,%r13d
  je     L150
L30:
  mov    $0x31,%ebx
  mov    %r13d,%r12d
  jmp    L169
L150:
  mov    0x8(%rsp),%rax
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
struct node *get_pawn_moves_black(struct node *currentNode, char *board, struct node *parentNode) {
  char x, y;
  int numMoves = 0;
  for (x = 'a'; x <= 'h'; x++) {
    for (y = '1'; y <= '8'; y++) {
      char p = get_piece(board, x, y);
      if (p == 'p') {
        if ((y == '7') && (is_occupied(board, x, y - 1) == 0) && (is_occupied(board, x, y - 2) == 0)) {
          currentNode = store_move(currentNode, board, 0, parentNode, x, y, x, y - 2);
          numMoves++;
        }
        if ((y > '1') && (is_occupied(board, x, y - 1) == 0)) {
          currentNode = store_move(currentNode, board, 0, parentNode, x, y, x, y - 1);
          numMoves++;
        }
        if ((x > 'a') && (y > '1') && (is_occupied(board, x - 1, y - 1) == 1)) {
          currentNode = store_move(currentNode, board, 0, parentNode, x, y, x - 1, y - 1);
          numMoves++;
        }
        if ((x < 'h') && (y > '1') && (is_occupied(board, x + 1, y - 1) == 1)) {
          currentNode = store_move(currentNode, board, 0, parentNode, x, y, x + 1, y - 1);
          numMoves++;
        }
      }
    }
  }
  return currentNode;
}
```