Futurebasic/Language/Reference/push

PUSH

Syntax

PUSH(var)
PUSH {BYTE|WORD|LONG}(address&)

Description

These statements put 1, 2 or 4 bytes onto the CPU stack, and adjust the stack pointer by a corresponding amount. PUSH is the opposite of POP.

If you use the first syntax, the data is copied from var, which must be a variable. The number of bytes put onto the stack depends on the data type of var:

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(No other variable types are valid with PUSH(var).)

If you use the second syntax, the data is copied from the memory which begins at address&, which must be a long integer expression or a POINTER variable. The number of bytes put onto the stack depends on which keyword you use:

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In CPU68k compiles, PUSH always adjusts the stack pointer by an even number of bytes. If you use PUSH(byteVar) or PUSH BYTE(address&) in a CPU68k compile, the stack pointer will be adjusted by 2 bytes, even though only one byte is copied from byteVar or address&.

PUSH is meant for careful use by advanced programmers. Your system can crash if the stack pointer is not adjusted carefully.

See Also

POP