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No scanning an object twice in each GC. #120

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Jan 10, 2025
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No scanning an object twice in each GC. #120

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36 changes: 18 additions & 18 deletions mmtk/Cargo.lock
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2 changes: 1 addition & 1 deletion mmtk/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ features = ["is_mmtk_object", "object_pinning", "sticky_immix_non_moving_nursery

# Uncomment the following lines to use mmtk-core from the official repository.
git = "https://github.com/mmtk/mmtk-core.git"
rev = "ec745353a8de72b645613e0fef3ab7f5f1ad9bd1"
rev = "68bf1b638263b250b12e55ef25bf8d09b01ca0b0"

# Uncomment the following line to use mmtk-core from a local repository.
#path = "../../mmtk-core"
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5 changes: 5 additions & 0 deletions mmtk/src/scanning.rs
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Expand Up @@ -10,6 +10,11 @@ use mmtk::{Mutator, MutatorContext};
pub struct VMScanning {}

impl Scanning<Ruby> for VMScanning {
/// CRuby may do some non-thread-safe operations, such as cleaning up the call cache, while
/// scanning an object. We force each object to be scanned at most once during each GC. This
/// currently only affects the MarkSweep plan.
const UNIQUE_OBJECT_ENQUEUING: bool = true;

fn support_slot_enqueuing(_tls: VMWorkerThread, _object: ObjectReference) -> bool {
false
}
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