2023年12月19日 (二) 07:00的最新版本

Branch

public int abs(int i) {
    if(i < 0)
        return -i;
    return i;
}

  public int abs(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
         0: iload_1
         1: ifge          7
         4: iload_1
         5: ineg
         6: ireturn
         7: iload_1
         8: ireturn
      LineNumberTable:
        line 3: 0
        line 4: 4
        line 5: 7
      StackMapTable: number_of_entries = 1
        frame_type = 7 /* same

public int compareWith2(int i) {
    if(i < 2)
        return -1;
    else if(i == 2)
        return 0;
    else
        return 1;
}

  public int compareWith2(int);
    descriptor: (I)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
         0: iload_1
         1: iconst_2
         2: if_icmpge     7
         5: iconst_m1
         6: ireturn
         7: iload_1
         8: iconst_2
         9: if_icmpne     14
        12: iconst_0
        13: ireturn
        14: iconst_1
        15: ireturn
      LineNumberTable:
        line 8: 0
        line 9: 5
        line 10: 7
        line 11: 12
        line 13: 14
      StackMapTable: number_of_entries = 2
        frame_type = 7 /* same */
        frame_type = 6 /* same */
}

Loop

public void repeat(int count) {
    int sum = 0;
    for(int i = 0; i < count; i++) {
        sum += 1;
    }
}

  public void repeat(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=2
         0: iconst_0
         1: istore_2
         2: iconst_0
         3: istore_3
         4: iload_3
         5: iload_1
         6: if_icmpge     18
         9: iinc          2, 1
        12: iinc          3, 1
        15: goto          4
        18: return
      LineNumberTable:
        line 17: 0
        line 18: 2
        line 19: 9
        line 18: 12
        line 21: 18
      StackMapTable: number_of_entries = 2
        frame_type = 253 /* append */
          offset_delta = 4
          locals = [ int, int ]
        frame_type = 250 /* chop */
          offset_delta = 13