zone

Vocabulary

vm

Class description

A struct that defines the memory layout for an allocation zone in the virtual machine. Factor code cannot directly access allocation zones, but the struct is used by the compiler to calculate memory addresses. Its slots are:

here	Memory address to the last allocated byte in the zone. Initially, this slot is equal to start but each allocation in the zone will increment this pointer.
start	Memory address to the start of the zone.
end	Memory address to the end of the zone.

Definition

USING: classes.struct ;

IN: vm

STRUCT: zone
    { here cell_t initial: 0 } { start cell_t initial: 0 }
    { end cell_t initial: 0 } { size cell_t initial: 0 } ;

Methods

USING: classes.struct classes.struct.private kernel vm ;

M: zone clone clone-underlying \ zone memory>struct ; inline


USING: accessors classes.struct combinators.smart vm ;

M: zone struct-slot-values
    { [ here>> ] [ start>> ] [ end>> ] [ size>> ] } cleave>array
    ; inline