Java字节码指令大全

左手的ㄟ右手 2021-10-19 09:56 413阅读 0赞

# 一、Java字节码指令大全 #

## 1.1.常量入栈指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x01</td> 
   <td>aconst_null</td> 
   <td>&nbsp;</td> 
   <td>null值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x02</td> 
   <td>iconst_m1</td> 
   <td>&nbsp;</td> 
   <td>-1(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x03</td> 
   <td>iconst_0</td> 
   <td>&nbsp;</td> 
   <td>0(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x04</td> 
   <td>iconst_1</td> 
   <td>&nbsp;</td> 
   <td>1(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x05</td> 
   <td>iconst_2</td> 
   <td>&nbsp;</td> 
   <td>2(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x06</td> 
   <td>iconst_3</td> 
   <td>&nbsp;</td> 
   <td>3(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x07</td> 
   <td>iconst_4</td> 
   <td>&nbsp;</td> 
   <td>4(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x08</td> 
   <td>iconst_5</td> 
   <td>&nbsp;</td> 
   <td>5(int)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x09</td> 
   <td>lconst_0</td> 
   <td>&nbsp;</td> 
   <td>0(long)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x0a</td> 
   <td>lconst_1</td> 
   <td>&nbsp;</td> 
   <td>1(long)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x0b</td> 
   <td>fconst_0</td> 
   <td>&nbsp;</td> 
   <td>0(float)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x0c</td> 
   <td>fconst_1</td> 
   <td>&nbsp;</td> 
   <td>1(float)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x0d</td> 
   <td>fconst_2</td> 
   <td>&nbsp;</td> 
   <td>2(float)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x0e</td> 
   <td>dconst_0</td> 
   <td>&nbsp;</td> 
   <td>0(double)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x0f</td> 
   <td>dconst_1</td> 
   <td>&nbsp;</td> 
   <td>1(double)值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x10</td> 
   <td>bipush</td> 
   <td>valuebyte</td> 
   <td>valuebyte值带符号扩展成int值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x11</td> 
   <td>sipush</td> 
   <td>valuebyte1valuebyte2</td> 
   <td>(valuebyte1 &lt;&lt; 8) | valuebyte2 值带符号扩展成int值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x12</td> 
   <td>ldc</td> 
   <td>indexbyte1</td> 
   <td>常量池中的常量值（int, float, string reference, object reference）入栈。</td> 
  </tr> 
  <tr> 
   <td>0x13</td> 
   <td>ldc_w</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>常量池中常量（int, float, string reference, object reference）入栈。</td> 
  </tr> 
  <tr> 
   <td>0x14</td> 
   <td>ldc2_w</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>常量池中常量（long, double）入栈。</td> 
  </tr> 
 </tbody> 
</table>

## 1.2.局部变量值转载到栈中指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x19</td> 
   <td>(wide)aload</td> 
   <td>indexbyte</td> 
   <td>从局部变量indexbyte中装载引用类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x2a</td> 
   <td>aload_0</td> 
   <td>&nbsp;</td> 
   <td>从局部变量0中装载引用类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x2b</td> 
   <td>aload_1</td> 
   <td>&nbsp;</td> 
   <td>从局部变量1中装载引用类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x2c</td> 
   <td>aload_2</td> 
   <td>&nbsp;</td> 
   <td>从局部变量2中装载引用类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x2d</td> 
   <td>aload_3</td> 
   <td>&nbsp;</td> 
   <td>从局部变量3中装载引用类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x15</td> 
   <td>(wide)iload</td> 
   <td>indexbyte</td> 
   <td>从局部变量indexbyte中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x1a</td> 
   <td>iload_0</td> 
   <td>&nbsp;</td> 
   <td>从局部变量0中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x1b</td> 
   <td>iload_1</td> 
   <td>&nbsp;</td> 
   <td>从局部变量1中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x1c</td> 
   <td>iload_2</td> 
   <td>&nbsp;</td> 
   <td>从局部变量2中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x1d</td> 
   <td>iload_3</td> 
   <td>&nbsp;</td> 
   <td>从局部变量3中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x16</td> 
   <td>(wide)lload</td> 
   <td>indexbyte</td> 
   <td>从局部变量indexbyte中装载long类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x1e</td> 
   <td>lload_0</td> 
   <td>&nbsp;</td> 
   <td>从局部变量0中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x1f</td> 
   <td>lload_1</td> 
   <td>&nbsp;</td> 
   <td>从局部变量1中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x20</td> 
   <td>lload_2</td> 
   <td>&nbsp;</td> 
   <td>从局部变量2中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x21</td> 
   <td>lload_3</td> 
   <td>&nbsp;</td> 
   <td>从局部变量3中装载int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x17</td> 
   <td>(wide)fload</td> 
   <td>indexbyte</td> 
   <td>从局部变量indexbyte中装载float类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x22</td> 
   <td>fload_0</td> 
   <td>&nbsp;</td> 
   <td>从局部变量0中装载float类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x23</td> 
   <td>fload_1</td> 
   <td>&nbsp;</td> 
   <td>从局部变量1中装载float类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x24</td> 
   <td>fload_2</td> 
   <td>&nbsp;</td> 
   <td>从局部变量2中装载float类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x25</td> 
   <td>fload_3</td> 
   <td>&nbsp;</td> 
   <td>从局部变量3中装载float类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x18</td> 
   <td>(wide)dload</td> 
   <td>indexbyte</td> 
   <td>从局部变量indexbyte中装载double类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x26</td> 
   <td>dload_0</td> 
   <td>&nbsp;</td> 
   <td>从局部变量0中装载double类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x27</td> 
   <td>dload_1</td> 
   <td>&nbsp;</td> 
   <td>从局部变量1中装载double类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x28</td> 
   <td>dload_2</td> 
   <td>&nbsp;</td> 
   <td>从局部变量2中装载double类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x29</td> 
   <td>dload_3</td> 
   <td>&nbsp;</td> 
   <td>从局部变量3中装载double类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x32</td> 
   <td>aaload</td> 
   <td>&nbsp;</td> 
   <td>从引用类型数组中装载指定项的值。</td> 
  </tr> 
  <tr> 
   <td>0x2e</td> 
   <td>iaload</td> 
   <td>&nbsp;</td> 
   <td>从int类型数组中装载指定项的值。</td> 
  </tr> 
  <tr> 
   <td>0x2f</td> 
   <td>laload</td> 
   <td>&nbsp;</td> 
   <td>从long类型数组中装载指定项的值。</td> 
  </tr> 
  <tr> 
   <td>0x30</td> 
   <td>faload</td> 
   <td>&nbsp;</td> 
   <td>从float类型数组中装载指定项的值。</td> 
  </tr> 
  <tr> 
   <td>0x31</td> 
   <td>daload</td> 
   <td>&nbsp;</td> 
   <td>从double类型数组中装载指定项的值。</td> 
  </tr> 
  <tr> 
   <td>0x33</td> 
   <td>baload</td> 
   <td>&nbsp;</td> 
   <td>从boolean类型数组或byte类型数组中装载指定项的值（先转换为int类型值，后压栈）。</td> 
  </tr> 
  <tr> 
   <td>0x34</td> 
   <td>caload</td> 
   <td>&nbsp;</td> 
   <td>从char类型数组中装载指定项的值（先转换为int类型值，后压栈）。</td> 
  </tr> 
  <tr> 
   <td>0x35</td> 
   <td>saload</td> 
   <td>&nbsp;</td> 
   <td>从short类型数组中装载指定项的值（先转换为int类型值，后压栈）。</td> 
  </tr> 
 </tbody> 
</table>

## 1.3.将栈顶值保存到局部变量中指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x3a</td> 
   <td>(wide)astore</td> 
   <td>indexbyte</td> 
   <td>将栈顶引用类型值保存到局部变量indexbyte中。</td> 
  </tr> 
  <tr> 
   <td>0x4b</td> 
   <td>astroe_0</td> 
   <td>&nbsp;</td> 
   <td>将栈顶引用类型值保存到局部变量0中。</td> 
  </tr> 
  <tr> 
   <td>0x4c</td> 
   <td>astore_1</td> 
   <td>&nbsp;</td> 
   <td>将栈顶引用类型值保存到局部变量1中。</td> 
  </tr> 
  <tr> 
   <td>0x4d</td> 
   <td>astore_2</td> 
   <td>&nbsp;</td> 
   <td>将栈顶引用类型值保存到局部变量2中。</td> 
  </tr> 
  <tr> 
   <td>0x4e</td> 
   <td>astore_3</td> 
   <td>&nbsp;</td> 
   <td>将栈顶引用类型值保存到局部变量3中。</td> 
  </tr> 
  <tr> 
   <td>0x36</td> 
   <td>(wide)istore</td> 
   <td>indexbyte</td> 
   <td>将栈顶int类型值保存到局部变量indexbyte中。</td> 
  </tr> 
  <tr> 
   <td>0x3b</td> 
   <td>istore_0</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值保存到局部变量0中。</td> 
  </tr> 
  <tr> 
   <td>0x3c</td> 
   <td>istore_1</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值保存到局部变量1中。</td> 
  </tr> 
  <tr> 
   <td>0x3d</td> 
   <td>istore_2</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值保存到局部变量2中。</td> 
  </tr> 
  <tr> 
   <td>0x3e</td> 
   <td>istore_3</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值保存到局部变量3中。</td> 
  </tr> 
  <tr> 
   <td>0x37</td> 
   <td>(wide)lstore</td> 
   <td>indexbyte</td> 
   <td>将栈顶long类型值保存到局部变量indexbyte中。</td> 
  </tr> 
  <tr> 
   <td>0x3f</td> 
   <td>lstore_0</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值保存到局部变量0中。</td> 
  </tr> 
  <tr> 
   <td>0x40</td> 
   <td>lstore_1</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值保存到局部变量1中。</td> 
  </tr> 
  <tr> 
   <td>0x41</td> 
   <td>lstore_2</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值保存到局部变量2中。</td> 
  </tr> 
  <tr> 
   <td>0x42</td> 
   <td>lstroe_3</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值保存到局部变量3中。</td> 
  </tr> 
  <tr> 
   <td>0x38</td> 
   <td>(wide)fstore</td> 
   <td>indexbyte</td> 
   <td>将栈顶float类型值保存到局部变量indexbyte中。</td> 
  </tr> 
  <tr> 
   <td>0x43</td> 
   <td>fstore_0</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值保存到局部变量0中。</td> 
  </tr> 
  <tr> 
   <td>0x44</td> 
   <td>fstore_1</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值保存到局部变量1中。</td> 
  </tr> 
  <tr> 
   <td>0x45</td> 
   <td>fstore_2</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值保存到局部变量2中。</td> 
  </tr> 
  <tr> 
   <td>0x46</td> 
   <td>fstore_3</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值保存到局部变量3中。</td> 
  </tr> 
  <tr> 
   <td>0x39</td> 
   <td>(wide)dstore</td> 
   <td>indexbyte</td> 
   <td>将栈顶double类型值保存到局部变量indexbyte中。</td> 
  </tr> 
  <tr> 
   <td>0x47</td> 
   <td>dstore_0</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值保存到局部变量0中。</td> 
  </tr> 
  <tr> 
   <td>0x48</td> 
   <td>dstore_1</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值保存到局部变量1中。</td> 
  </tr> 
  <tr> 
   <td>0x49</td> 
   <td>dstore_2</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值保存到局部变量2中。</td> 
  </tr> 
  <tr> 
   <td>0x4a</td> 
   <td>dstore_3</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值保存到局部变量3中。</td> 
  </tr> 
  <tr> 
   <td>0x53</td> 
   <td>aastore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶引用类型值保存到指定引用类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x4f</td> 
   <td>iastore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值保存到指定int类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x50</td> 
   <td>lastore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值保存到指定long类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x51</td> 
   <td>fastore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值保存到指定float类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x52</td> 
   <td>dastore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值保存到指定double类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x54</td> 
   <td>bastroe</td> 
   <td>&nbsp;</td> 
   <td>将栈顶boolean类型值或byte类型值保存到指定boolean类型数组或byte类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x55</td> 
   <td>castore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶char类型值保存到指定char类型数组的指定项。</td> 
  </tr> 
  <tr> 
   <td>0x56</td> 
   <td>sastore</td> 
   <td>&nbsp;</td> 
   <td>将栈顶short类型值保存到指定short类型数组的指定项。</td> 
  </tr> 
 </tbody> 
</table>

## 1.4.wide指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0xc4</td> 
   <td>wide</td> 
   <td>&nbsp;</td> 
   <td>使用附加字节扩展局部变量索引（iinc指令特殊）。</td> 
  </tr> 
 </tbody> 
</table>

## 1.5.通用（无类型）栈操作指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x00</td> 
   <td>nop</td> 
   <td>&nbsp;</td> 
   <td>空操作。</td> 
  </tr> 
  <tr> 
   <td>0x57</td> 
   <td>pop</td> 
   <td>&nbsp;</td> 
   <td>从栈顶弹出一个字长的数据。</td> 
  </tr> 
  <tr> 
   <td>0x58</td> 
   <td>pop2</td> 
   <td>&nbsp;</td> 
   <td>从栈顶弹出两个字长的数据。</td> 
  </tr> 
  <tr> 
   <td>0x59</td> 
   <td>dup</td> 
   <td>&nbsp;</td> 
   <td>复制栈顶一个字长的数据，将复制后的数据压栈。</td> 
  </tr> 
  <tr> 
   <td>0x5a</td> 
   <td>dup_x1</td> 
   <td>&nbsp;</td> 
   <td>复制栈顶一个字长的数据，弹出栈顶两个字长数据，先将复制后的数据压栈，再将弹出的两个字长数据压栈。</td> 
  </tr> 
  <tr> 
   <td>0x5b</td> 
   <td>dup_x2</td> 
   <td>&nbsp;</td> 
   <td>复制栈顶一个字长的数据，弹出栈顶三个字长的数据，将复制后的数据压栈，再将弹出的三个字长的数据压栈。</td> 
  </tr> 
  <tr> 
   <td>0x5c</td> 
   <td>dup2</td> 
   <td>&nbsp;</td> 
   <td>复制栈顶两个字长的数据，将复制后的两个字长的数据压栈。</td> 
  </tr> 
  <tr> 
   <td>0x5d</td> 
   <td>dup2_x1</td> 
   <td>&nbsp;</td> 
   <td>复制栈顶两个字长的数据，弹出栈顶三个字长的数据，将复制后的两个字长的数据压栈，再将弹出的三个字长的数据压栈。</td> 
  </tr> 
  <tr> 
   <td>0x5e</td> 
   <td>dup2_x2</td> 
   <td>&nbsp;</td> 
   <td>复制栈顶两个字长的数据，弹出栈顶四个字长的数据，将复制后的两个字长的数据压栈，再将弹出的四个字长的数据压栈。</td> 
  </tr> 
  <tr> 
   <td>0x5f</td> 
   <td>swap</td> 
   <td>&nbsp;</td> 
   <td>交换栈顶两个字长的数据的位置。<a href="https://links.jianshu.com/go?to=http%3A%2F%2Flib.csdn.net%2Fbase%2Fjavaee" rel="nofollow">Java</a>指令中没有提供以两个字长为单位的交换指令。</td> 
  </tr> 
 </tbody> 
</table>

## 1.7.类型转换指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x86</td> 
   <td>i2f</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值转换为float类型值。</td> 
  </tr> 
  <tr> 
   <td>0x85</td> 
   <td>i2l</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值转换为long类型值。</td> 
  </tr> 
  <tr> 
   <td>0x87</td> 
   <td>i2d</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值转换为double类型值。</td> 
  </tr> 
  <tr> 
   <td>0x8b</td> 
   <td>f2i</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值转换为int类型值。</td> 
  </tr> 
  <tr> 
   <td>0x8c</td> 
   <td>f2l</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值转换为long类型值。</td> 
  </tr> 
  <tr> 
   <td>0x8d</td> 
   <td>f2d</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值转换为double类型值。</td> 
  </tr> 
  <tr> 
   <td>0x88</td> 
   <td>l2i</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值转换为int类型值。</td> 
  </tr> 
  <tr> 
   <td>0x89</td> 
   <td>l2f</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值转换为float类型值。</td> 
  </tr> 
  <tr> 
   <td>0x8a</td> 
   <td>l2d</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值转换double类型值。</td> 
  </tr> 
  <tr> 
   <td>0x8e</td> 
   <td>d2i</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值转换为int类型值。</td> 
  </tr> 
  <tr> 
   <td>0x90</td> 
   <td>d2f</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值转换为float类型值。</td> 
  </tr> 
  <tr> 
   <td>0x8f</td> 
   <td>d2l</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值转换为long类型值。</td> 
  </tr> 
  <tr> 
   <td>0x91</td> 
   <td>i2b</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值截断成byte类型，后带符号扩展成int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x92</td> 
   <td>i2c</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值截断成char类型值，后带符号扩展成int类型值入栈。</td> 
  </tr> 
  <tr> 
   <td>0x93</td> 
   <td>i2s</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值截断成short类型值，后带符号扩展成int类型值入栈。</td> 
  </tr> 
 </tbody> 
</table>

## 1.8.整数运算 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x60</td> 
   <td>iadd</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两int类型数相加，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x64</td> 
   <td>isub</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两int类型数相减，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x68</td> 
   <td>imul</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两int类型数相乘，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x6c</td> 
   <td>idiv</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两int类型数相除，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x70</td> 
   <td>irem</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两int类型数取模，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x74</td> 
   <td>ineg</td> 
   <td>&nbsp;</td> 
   <td>将栈顶int类型值取负，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x61</td> 
   <td>ladd</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两long类型数相加，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x65</td> 
   <td>lsub</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两long类型数相减，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x69</td> 
   <td>lmul</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两long类型数相乘，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x6d</td> 
   <td>ldiv</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两long类型数相除，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x71</td> 
   <td>lrem</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两long类型数取模，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x75</td> 
   <td>lneg</td> 
   <td>&nbsp;</td> 
   <td>将栈顶long类型值取负，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x84</td> 
   <td>(wide)iinc</td> 
   <td>indexbyteconstbyte</td> 
   <td>将整数值constbyte加到indexbyte指定的int类型的局部变量中。</td> 
  </tr> 
 </tbody> 
</table>

## 1.9.浮点运算 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x62</td> 
   <td>fadd</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两float类型数相加，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x66</td> 
   <td>fsub</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两float类型数相减，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x6a</td> 
   <td>fmul</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两float类型数相乘，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x6e</td> 
   <td>fdiv</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两float类型数相除，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x72</td> 
   <td>frem</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两float类型数取模，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x76</td> 
   <td>fneg</td> 
   <td>&nbsp;</td> 
   <td>将栈顶float类型值取反，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x63</td> 
   <td>dadd</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两double类型数相加，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x67</td> 
   <td>dsub</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两double类型数相减，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x6b</td> 
   <td>dmul</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两double类型数相乘，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x6f</td> 
   <td>ddiv</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两double类型数相除，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x73</td> 
   <td>drem</td> 
   <td>&nbsp;</td> 
   <td>将栈顶两double类型数取模，结果入栈。</td> 
  </tr> 
  <tr> 
   <td>0x77</td> 
   <td>dneg</td> 
   <td>&nbsp;</td> 
   <td>将栈顶double类型值取负，结果入栈。</td> 
  </tr> 
 </tbody> 
</table>

## 1.10.逻辑运算——移位运算 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x78</td> 
   <td>ishl</td> 
   <td>&nbsp;</td> 
   <td>左移int类型值。</td> 
  </tr> 
  <tr> 
   <td>0x79</td> 
   <td>lshl</td> 
   <td>&nbsp;</td> 
   <td>左移long类型值。</td> 
  </tr> 
  <tr> 
   <td>0x7a</td> 
   <td>ishr</td> 
   <td>&nbsp;</td> 
   <td>算术右移int类型值。</td> 
  </tr> 
  <tr> 
   <td>0x7b</td> 
   <td>lshr</td> 
   <td>&nbsp;</td> 
   <td>算术右移long类型值。</td> 
  </tr> 
  <tr> 
   <td>0x7c</td> 
   <td>iushr</td> 
   <td>&nbsp;</td> 
   <td>逻辑右移int类型值。</td> 
  </tr> 
  <tr> 
   <td>0x7d</td> 
   <td>lushr</td> 
   <td>&nbsp;</td> 
   <td>逻辑右移long类型值。</td> 
  </tr> 
 </tbody> 
</table>

## 1.11.逻辑运算——按位布尔运算 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x73</td> 
   <td>iand</td> 
   <td>&nbsp;</td> 
   <td>对int类型按位与运算。</td> 
  </tr> 
  <tr> 
   <td>0x7f</td> 
   <td>land</td> 
   <td>&nbsp;</td> 
   <td>对long类型的按位与运算。</td> 
  </tr> 
  <tr> 
   <td>0x80</td> 
   <td>ior</td> 
   <td>&nbsp;</td> 
   <td>对int类型的按位或运算。</td> 
  </tr> 
  <tr> 
   <td>0x81</td> 
   <td>lor</td> 
   <td>&nbsp;</td> 
   <td>对long类型的按位或运算。</td> 
  </tr> 
  <tr> 
   <td>0x82</td> 
   <td>ixor</td> 
   <td>&nbsp;</td> 
   <td>对int类型的按位异或运算。</td> 
  </tr> 
  <tr> 
   <td>0x83</td> 
   <td>lxor</td> 
   <td>&nbsp;</td> 
   <td>对long类型的按位异或运算。</td> 
  </tr> 
 </tbody> 
</table>

## 1.12.控制流指令——条件跳转指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x99</td> 
   <td>ifeq</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶int类型值为0则跳转。</td> 
  </tr> 
  <tr> 
   <td>0x9a</td> 
   <td>ifne</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶int类型值不为0则跳转。</td> 
  </tr> 
  <tr> 
   <td>0x9b</td> 
   <td>iflt</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶int类型值小于0则跳转。</td> 
  </tr> 
  <tr> 
   <td>0x9e</td> 
   <td>ifle</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶int类型值小于等于0则跳转。</td> 
  </tr> 
  <tr> 
   <td>0x9d</td> 
   <td>ifgt</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶int类型值大于0则跳转。</td> 
  </tr> 
  <tr> 
   <td>0x9c</td> 
   <td>ifge</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶int类型值大于等于0则跳转。</td> 
  </tr> 
  <tr> 
   <td>0x9f</td> 
   <td>if_icmpeq</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两int类型值相等则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa0</td> 
   <td>if_icmpne</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两int类型值不相等则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa1</td> 
   <td>if_icmplt</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两int类型值前小于后则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa4</td> 
   <td>if_icmple</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两int类型值前小于等于后则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa3</td> 
   <td>if_icmpgt</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两int类型值前大于后则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa2</td> 
   <td>if_icmpge</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两int类型值前大于等于后则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xc6</td> 
   <td>ifnull</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶引用值为null则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xc7</td> 
   <td>ifnonnull</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶引用值不为null则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa5</td> 
   <td>if_acmpeq</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两引用类型值相等则跳转。</td> 
  </tr> 
  <tr> 
   <td>0xa6</td> 
   <td>if_acmpne</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>若栈顶两引用类型值不相等则跳转。</td> 
  </tr> 
 </tbody> 
</table>

## 1.13.控制流指令——比较指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0x94</td> 
   <td>lcmp</td> 
   <td>&nbsp;</td> 
   <td>比较栈顶两long类型值，前者大，1入栈；相等，0入栈；后者大，-1入栈。</td> 
  </tr> 
  <tr> 
   <td>0x95</td> 
   <td>fcmpl</td> 
   <td>&nbsp;</td> 
   <td>比较栈顶两float类型值，前者大，1入栈；相等，0入栈；后者大，-1入栈；有NaN存在，-1入栈。</td> 
  </tr> 
  <tr> 
   <td>0x96</td> 
   <td>fcmpg</td> 
   <td>&nbsp;</td> 
   <td>比较栈顶两float类型值，前者大，1入栈；相等，0入栈；后者大，-1入栈；有NaN存在，-1入栈。</td> 
  </tr> 
  <tr> 
   <td>0x97</td> 
   <td>dcmpl</td> 
   <td>&nbsp;</td> 
   <td>比较栈顶两double类型值，前者大，1入栈；相等，0入栈；后者大，-1入栈；有NaN存在，-1入栈。</td> 
  </tr> 
  <tr> 
   <td>0x98</td> 
   <td>dcmpg</td> 
   <td>&nbsp;</td> 
   <td>比较栈顶两double类型值，前者大，1入栈；相等，0入栈；后者大，-1入栈；有NaN存在，-1入栈。</td> 
  </tr> 
 </tbody> 
</table>

## 1.14.控制流指令——无条件跳转指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0xa7</td> 
   <td>goto</td> 
   <td>branchbyte1branchbyte2</td> 
   <td>无条件跳转到指定位置。</td> 
  </tr> 
  <tr> 
   <td>0xc8</td> 
   <td>goto_w</td> 
   <td>branchbyte1branchbyte2branchbyte3branchbyte4</td> 
   <td>无条件跳转到指定位置（宽索引）。</td> 
  </tr> 
 </tbody> 
</table>

## 1.15.对象操作指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0xbb</td> 
   <td>new</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>创建新的对象实例。</td> 
  </tr> 
  <tr> 
   <td>0xc0</td> 
   <td>checkcast</td> 
   <td>indexbyte1indexbyte</td> 
   <td>类型强转。</td> 
  </tr> 
  <tr> 
   <td>0xc1</td> 
   <td>instanceof</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>判断类型。</td> 
  </tr> 
  <tr> 
   <td>0xb4</td> 
   <td>getfield</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>获取对象字段的值。</td> 
  </tr> 
  <tr> 
   <td>0xb5</td> 
   <td>putfield</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>给对象字段赋值。</td> 
  </tr> 
  <tr> 
   <td>0xb2</td> 
   <td>getstatic</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>获取静态字段的值。</td> 
  </tr> 
  <tr> 
   <td>0xb3</td> 
   <td>putstatic</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>给静态字段赋值。</td> 
  </tr> 
 </tbody> 
</table>

## 1.16.数组操作指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0xbc</td> 
   <td>newarray</td> 
   <td>atype</td> 
   <td>创建type类型的数组。</td> 
  </tr> 
  <tr> 
   <td>0xbd</td> 
   <td>anewarray</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>创建引用类型的数组。</td> 
  </tr> 
  <tr> 
   <td>0xbe</td> 
   <td>arraylength</td> 
   <td>&nbsp;</td> 
   <td>获取一维数组的长度。</td> 
  </tr> 
  <tr> 
   <td>0xc5</td> 
   <td>multianewarray</td> 
   <td>indexbyte1indexbyte2dimension</td> 
   <td>创建dimension维度的数组。</td> 
  </tr> 
 </tbody> 
</table>

## 1.17.方法调用指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0xb7</td> 
   <td>invokespecial</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>编译时方法绑定调用方法。</td> 
  </tr> 
  <tr> 
   <td>0xb6</td> 
   <td>invokevirtual</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>运行时方法绑定调用方法。</td> 
  </tr> 
  <tr> 
   <td>0xb8</td> 
   <td>invokestatic</td> 
   <td>indexbyte1indexbyte2</td> 
   <td>调用静态方法。</td> 
  </tr> 
  <tr> 
   <td>0xb9</td> 
   <td>invokeinterface</td> 
   <td>indexbyte1indexbyte2count0</td> 
   <td>调用接口方法。</td> 
  </tr> 
 </tbody> 
</table>

## 1.18.方法返回指令 ##

<table> 
 <thead> 
  <tr> 
   <th>指令码</th> 
   <th>操作码（助记符）</th> 
   <th>操作数</th> 
   <th>描述（栈指操作数栈）</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>0xac</td> 
   <td>ireturn</td> 
   <td>&nbsp;</td> 
   <td>返回int类型值。</td> 
  </tr> 
  <tr> 
   <td>0xad</td> 
   <td>lreturn</td> 
   <td>&nbsp;</td> 
   <td>返回long类型值。</td> 
  </tr> 
  <tr> 
   <td>0xae</td> 
   <td>freturn</td> 
   <td>&nbsp;</td> 
   <td>返回float类型值。</td> 
  </tr> 
  <tr> 
   <td>0xaf</td> 
   <td>dreturn</td> 
   <td>&nbsp;</td> 
   <td>返回double类型值。</td> 
  </tr> 
  <tr> 
   <td>0xb0</td> 
   <td>areturn</td> 
   <td>&nbsp;</td> 
   <td>返回引用类型值。</td> 
  </tr> 
  <tr> 
   <td>0xb1</td> 
   <td>return</td> 
   <td>&nbsp;</td> 
   <td>void函数返回。</td> 
  </tr> 
 </tbody> 
</table>

## 1.19.线程同步指令 ##

<table> 
 <thead> 
  <tr> 
   <th>&nbsp;</th> 
   <th>&nbsp;</th> 
   <th>&nbsp;</th> 
   <th>&nbsp;</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>指令码</td> 
   <td>操作码（助记符）</td> 
   <td>操作数</td> 
   <td>描述（栈指操作数栈）</td> 
  </tr> 
  <tr> 
   <td>0xc2</td> 
   <td>monitorenter</td> 
   <td>&nbsp;</td> 
   <td>进入并获得对象监视器。</td> 
  </tr> 
  <tr> 
   <td>0xc3</td> 
   <td>monitorexit</td> 
   <td>&nbsp;</td> 
   <td>释放并退出对象监视器。</td> 
  </tr> 
 </tbody> 
</table>