JVM指令
pop
Pop the top operand stack value 弹出 操作数 栈顶的值
astore_<n>
Store reference
into local variable
aload_<n>
Load reference
from local variable
getstatic
Get static
field from class
ldc
Push item from run-time constant pool
athrow
Throw exception or error
areturn
Return reference
from method