lload : retrieve long from local variable : index : visitVarInsn()

Description

lload retrieves a long integer held in a local variable and pushes it onto the operand stack.

Since long integers are 64-bits wide, and each local variable only holds up to 32 bits, Java uses two consecutive local variables, <varnum> and <varnum> + 1 to store a long. So lload <varnum> actually places the values of both <varnum> and <varnum> + 1 onto the operand stack.

Both <varnum> and <varnum> + 1 must be valid local variable numbers in the current frame, and together they must be holding a long.

Remember that attempting to treat two-word values as two independent single-word values will produce a verification error. So trying to retrieve either <varnum> or <varnum> + 1 independently (e.g. using iload <varnum>) will produce a verification error. Similarly, if you store a non-long value in <varnum>, then <varnum> + 1 becomes invalidated until a new value is stored in it.

Example

lconst_1        ; push the long integer 1 onto the stack
lstore 3        ; pop 1 off of the stack and store in local variables 3 and 4
lload 3         ; push the value from local variables 3 and 4 (the long integer 1)
                ; back onto the stack

See also

fload iload dload

Stack

Before	After
...	result-word1
	result-word2
	...

Bytecode

Type	Description
u1	lload opcode = 0x16 (22)
u1	<varnum>

There is also a wide format for this instruction, which supports access to all local variables from 0 to 65535:

Type	Description
u1	wide opcode = 0xC4 (196)
u1	lload opcode = 0x16 (22)
u2	<varnum>