Module specs 

Macros

define_vm_metadata_spec 🔒

Structs

VMGlobalLogBitSpec

1-bit global metadata to log an object.

VMLocalForwardingBitsSpec

2-bit local metadata for spaces that store a forwarding state for objects. If this spec is defined in the header, it can be defined with a position of the lowest 2 bits in the forwarding pointer.

VMLocalForwardingPointerSpec

1-word local metadata for spaces that may copy objects. This metadata has to be stored in the header. This metadata can be defined at a position within the object payload. As a forwarding pointer is only stored in dead objects which is not accessible by the language, it is okay that store a forwarding pointer overwrites object payload

VMLocalLOSMarkNurserySpec

2-bits local metadata for the large object space. The two bits serve as the mark bit and the nursery bit.

VMLocalMarkBitSpec

1-bit local metadata for spaces that need to mark an object.

VMLocalPinningBitSpec

1-bit local metadata for spaces that support pinning.