Trait GCMethods

pub(crate) trait GCMethods: Initialize {
    // Required method
    unsafe fn post_barrier(v: *mut Self, prev: Self, next: Self);

    // Provided method
    unsafe fn initial() -> Self { ... }
}

A trait for types which can place appropriate GC barriers.

• https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Internals/Garbage_collection#Incremental_marking
• https://dxr.mozilla.org/mozilla-central/source/js/src/gc/Barrier.h

Required Methods

unsafe fn post_barrier(v: *mut Self, prev: Self, next: Self)

Place a post-write barrier

Provided Methods

unsafe fn initial() -> Self

Create a default value

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl GCMethods for *mut JSObject

unsafe fn post_barrier( v: *mut *mut JSObject, prev: *mut JSObject, next: *mut JSObject, )

impl GCMethods for *mut BigInt

unsafe fn post_barrier( v: *mut *mut BigInt, prev: *mut BigInt, next: *mut BigInt, )

impl GCMethods for *mut JSFunction

unsafe fn post_barrier( v: *mut *mut JSFunction, prev: *mut JSFunction, next: *mut JSFunction, )

impl GCMethods for *mut JSScript

unsafe fn post_barrier( v: *mut *mut JSScript, prev: *mut JSScript, next: *mut JSScript, )

impl GCMethods for *mut JSString

unsafe fn post_barrier( v: *mut *mut JSString, prev: *mut JSString, next: *mut JSString, )

impl GCMethods for *mut Symbol

unsafe fn post_barrier(_: *mut *mut Symbol, _: *mut Symbol, _: *mut Symbol)

Implementors

impl GCMethods for PropertyKey

impl GCMethods for Value

impl GCMethods for PropertyDescriptor