A.3 Instructions by Category

This section contains a listing of the instructions and what they do, grouped by category. Here is a key to the descriptions:

a The top slot of the stack. May be an int, float, or reference.
b The second stack slot. May be an int, float, or reference.
c The third stack slot. May be an int, float, or reference.
d The fourth stack slot. May be an int, float, or reference.
ab The long or double on top of the stack, made up of slots a and b.
cd The long or double second on the stack, made up of slots c and d.

A.3.1 Arithmetic

Mnemonic Arguments Description
dadd   Add double (ab+cd)
dcmpg   Compare double
dcmpl   Compare double
ddiv   Divide double (ab/cd)
dmul   Multiply double (ab*cd)
dneg   Negate double (-ab)
drem   Remainder double (ab%cd)
dsub   Subtract double (ab-cd)
fadd   Add float (a+b)
fcmpg   Compare float
fcmpl   Compare float
fdiv   Divide float (a/b)
fmul   Multiply float (a*b)
fneg   Negate float (-a)
frem   Remainder float (a%b)
fsub   Subtract float (a-b)
i2b   Convert int to byte
i2c   Convert int to char
i2s   Convert int to short
iadd   Add int (a+b)
iand   Bitwise and ints (a & b)
idiv   Divide ints (a/b)
imul   Multiply ints (a*b)
ineg   Negate int (-a)
ior   Bitwise or ints (a | b)
irem   Remainder int (a%b)
ishl   Shift int left (a << b)
ishr   Shift int right (a >> c)
isub   Subtract int (a-b)
iushr   Unsigned shift int right (a >>> c)
ixor   Bitwise xor ints (a ^ b)
ladd   Add long (ab+cd)
land   Bitwise and longs (ab & cd)
lcmp   Compare longs
ldiv   Divide long (ab/cd)
lmul   Multiply long (ab*cd)
lneg   Negate long (-ab)
lor   Bitwise or longs (ab | cd)
lrem   Remainder longs (ab%cd)
lshl   Shift long left (bc << 9)
lshr   Shift long right (bc >> 9)
lsub   Subtract long (ab-cd)
lushr   Unsigned shift long right (bc >>> 9)
lxor   Bitwise x or longs (ab ^ cd)

A.3.2 Array

Mnemonic Arguments Description
aaload   Push array element a from array b
aastore   Store a in array element b of array c
anewarray class Create array of class, length a
arraylength   Length of array a
athrow   Throw exception a
baload   Push array element a from array b
bastore   Store a in array element b of array c
caload   Push array element a from array b
castore   Store a in array element
daload   Push array element a from array b
dastore   Store ab in array element
faload   Push array element a from array b
fastore   Store a in array element b of array c
iaload   Push array element a from array b
iastore   Store a in array element
laload   Push array element a from array b
lastore   Store ab in array element c of array d
multianewarray class n Create multidimensional array with first n dimensions initialized to lengths a, b, c. . .
newarray type Create array of type, length a
saload   Push array element a from array b
sastore   Store a in array element b of array c

A.3.3 Constant

Mnemonic Arguments Description
aconst_null   Push null reference
bipush n Push int between 128 and 127
dconst_0   Push 0 (double)
dconst_1   Push 1 (double)
fconst_0   Push 0 (float)
fconst_1   Push 1 (float)
fconst_2   Push 2 (float)
iconst_0   Push 0 (int)
iconst_1   Push 1 (int)
iconst_2   Push 2 (int)
iconst_3   Push 3 (int)
iconst_4   Push 4 (int)
iconst_5   Push 5 (int)
iconst_m1   Push 1(int)
lconst_0   Push 0 (long)
lconst_1   Push 1 (long)
ldc x Push x (a constant int, float, or String)
ldc_w x Push x (a constant int, float, or String)
ldc2_w x Push x (a constant long or double)
sipush n Push int between 32,768 and 32767

A.3.4 Control

Mnemonic Arguments Description
areturn   Return reference from method
dreturn   Return double from method
freturn   Return float from method
goto label Branch always
goto_w label Branch always to label
if_acmpeq label Branch if a == b
if_acmpne label Branch if a != b
if_icmpeq label Branch if a > b
if_icmpge label Branch if a >= b
if_icmpgt label Branch if a > b
if_icmple label Branch if a <= b
if_icmplt label Branch if a < b
if_icmpne label Branch if a != b
ifeq label Branch if a == 0
ifge label Branch if a >= 0
ifgt label Branch if a > 0
ifle label Branch if a <= 0
iflt label Branch if a < 0
ifne label Branch if a != 0
ifnonnull label Branch if a is not null
ifnull label Branch if a is null
ireturn   Return int from method
jsr label Branch to label; push return location
jsr_w label Jump to label
lookupswitch

tag1: label1

tag2: label2...

default: labeln

Branch to label1 on tag1, label2 on tag2, . . . , labeln otherwise
lreturn   Return long from method
nop   Do nothing
ret n Branch to location in variable n
return   Return from method
tableswitch

n

label1

label2

. . .

default: labeln

Branch to label1 on n, label2 on n+1, . . . , labeln otherwise

A.3.5 Data Type Conversion

Mnemonic Arguments Description
d2f   Convert double ab to float
d2i   Convert double ab to int
d2l   Convert double ab to long
f2d   Convert float a to double
f2i   Convert float a to int
f2l   Convert float a to long
i2d   Convert int a to double
i2f   Convert int a to float
i2l   Convert int a to long
l2d   Convert long ab to double
l2f   Convert long ab to float
l2i   Convert long ab to int

A.3.6 Object

Mnemonic Arguments Description
checkcast class Throw exception if a is not an instance of class
getfield class/field desc Push object field from object a
getstatic class/field desc Push static field
instanceof class Push 1 if a is class, 0 otherwise
invokeinterface class/method desc n Invoke method through interface with n argument words
invokespecial class/method desc Invoke method directly
invokestatic class/method desc Invoke static method
invokevirtual class/method desc Invoke method virtually
new class Create new object of class
putfield class/field desc Store a in object field
putstatic class/field desc Store a in static field

A.3.7 Stack Manipulation

Mnemonic Arguments Description
dup   Duplicate a
dup_x1   Duplicate a, insert under b
dup_x2   Duplicate a, insert under c
dup2   Duplicate ab
dup2_x1   Duplicate ab, insert under c
dup2_x2   Duplicate ab, insert under d
pop   Remove a
pop2   Remove ab
swap   Swap a and b

A.3.8 Synchronization

Mnemonic Arguments Description
monitorenter   Gain control of monitor of a
monitorexit   Release monitor of a

A.3.9 Variable

Mnemonic Arguments Description
aload n Push local variable n
aload_0   Push local variable 0
aload_1   Push local variable 1
aload_2   Push local variable 2
aload_3   Push local variable 3
astore n Store a in local variable n
astore_0   Store a in local variable 0
astore_1   Store a in local variable 1
astore_2   Store a in local variable 2
astore_3   Store a in local variable 3
dload n Push local variable n
dload_0   Push local variable 0
dload_1   Push local variable 1
dload_2   Push local variable 2
dload_3   Push local variable 3
dstore n Store ab in local variable n
dstore_0   Store ab in local variable 0
dstore_1   Store ab in local variable 1
dstore_2   Store ab in local variable 2
dstore_3   Store ab in local variable 3
fload n Push local variable n
fload_0   Push local variable 0
fload_1   Push local variable 1
fload_2   Push local variable 2
fload_3   Push local variable 3
fstore n Store a in local variable n
fstore_0   Store a in local variable 0
fstore_1   Store a in local variable 1
fstore_2   Store a in local variable 2
fstore_3   Store a in local variable 3
iinc n increment Increment local variable
iload n Push local variable n
iload_0   Push local variable 0
iload_1   Push local variable 1
iload_2   Push local variable 2
iload_3   Push local variable 3
istore n Store a in local variable n
istore_0   Store a in local variable 0
istore_1   Store a in local variable 1
istore_2   Store a in local variable 2
istore_3   Store a in local variable 3
lload n Push local variable n
lload_0   Push local variable 0
lload_1   Push local variable 1
lload_2   Push local variable 2
lload_3   Push local variable 3
lstore n Store ab in local variable n
lstore_0   Store ab in local variable 0
lstore_1   Store ab in local variable 1
lstore_2   Store ab in local variable 2
lstore_3   Store ab in local variable 3
wide instruction arguments Like instruction, except using wider range of values



Programming for the Java Virtual Machine
Programming for the Javaв„ў Virtual Machine
ISBN: 0201309726
EAN: 2147483647
Year: 1998
Pages: 158
Authors: Joshua Engel

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