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JVM instructions

2022-07-02 07:56:00 【kq1983】


Character meaning


i representative int Data of type
l representative long Data of type
s representative short Data of type
b representative byte Data of type
c representative char Data of type
f representative float Data of type
d representative double Data of type
a representative reference Data of type


load


Load a local variable into the operand stack 


       

        iload、lload、fload、dload、aload
       

       
    
        
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store


An instruction that stores a value from the stack of operands to the local variable table 


       

        istore、lstore、fstore、dstore、astore
       

       
    
        
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iconst etc.


Instruction to load a constant into the operand stack 


       

        bipush、sipush、idc、idc_w、ldc2_w、aconst_null、iconst_ml
        
iconst_<i>、iconst_<l>、iconst_<f>、iconst_<d>
       

       
    
        
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iconst


When int Value -1~5 when ,JVM use iconst Instruction pushes constants onto the stack
int Value 0~5 when ,JVM use iconst_0、iconst_1、iconst_2、iconst_3、iconst_4、iconst_5 Instruction pushes constants onto the stack ;
Value -1 when , use iconst_m1 Instruction pushes constants onto the stack


Arithmetic instruction

Add 

       

        iadd、 ladd、 fadd、 dadd
       

       
    
        
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Subtraction 

       

        isub、lsub、fsub、dsub
       

       
    
        
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Multiplication 

       

        imul、lmul、fmul、dmul
       

       
    
        
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division 

       

        idiv、ldiv、fdiv、ddiv
       

       
    
        
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Seeking remainder 

       

        irem、lrem、frem、drem、
       

       
    
        
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Find negative value 

       

        ineg、lneg、fneg、dneg
       

       
    
        
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Shift instructions 

       

        ishl、ishr、iushr、ishl、lshr、lushr
       

       
    
        
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Press bit or command 

       

        ior、lor
       

       
    
        
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Press bit and command 

       

        iand、land
       

       
    
        
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Bitwise XOR command 

       

        ixor、lxor
       

       
    
        
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Local variable self increasing 

       

        iinc
       

       
    
        
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Comparison instruction 

       

        dcmpg、dcmpl、fcmpg、fcmpl、lcmp
       

       
    
        
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ldc

       

        #  Extract data from the runtime constant pool and push it into the operand stack 
        
ldc
       

       
    
        
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dup

       

        #  Copy the value at the top of the operand stack , And insert it into the top of the stack 
        
# Duplicate the top operand stack value
        
dup
       

       
    
        
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invoke

invokespecial

       

        #  Call the instance initialization method, such as <init> Method 
        
 invokespecial
       

       
    
        
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https://yzsam.com/2022/02/202202151755528370.html

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