#[repr(u32)]
pub enum OnNewGlobalHookOption { FireOnNewGlobalHook, DontFireOnNewGlobalHook, }
Expand description

During global creation, we fire notifications to callbacks registered via the Debugger API. These callbacks are arbitrary script, and can touch the global in arbitrary ways. When that happens, the global should not be in a half-baked state. But this creates a problem for consumers that need to set slots on the global to put it in a consistent state.

This API provides a way for consumers to set slots atomically (immediately after the global is created), before any debugger hooks are fired. It’s unfortunately on the clunky side, but that’s the way the cookie crumbles.

If callers have no additional state on the global to set up, they may pass |FireOnNewGlobalHook| to JS_NewGlobalObject, which causes that function to fire the hook as its final act before returning. Otherwise, callers should pass |DontFireOnNewGlobalHook|, which means that they are responsible for invoking JS_FireOnNewGlobalObject upon successfully creating the global. If an error occurs and the operation aborts, callers should skip firing the hook. But otherwise, callers must take care to fire the hook exactly once before compiling any script in the global’s scope (we have assertions in place to enforce this). This lets us be sure that debugger clients never miss breakpoints.

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FireOnNewGlobalHook

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DontFireOnNewGlobalHook

Trait Implementations§

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impl Clone for OnNewGlobalHookOption

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fn clone(&self) -> OnNewGlobalHookOption

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for OnNewGlobalHookOption

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Hash for OnNewGlobalHookOption

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fn hash<__H>(&self, state: &mut __H)where __H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq<OnNewGlobalHookOption> for OnNewGlobalHookOption

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fn eq(&self, other: &OnNewGlobalHookOption) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for OnNewGlobalHookOption

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impl Eq for OnNewGlobalHookOption

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impl StructuralEq for OnNewGlobalHookOption

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impl StructuralPartialEq for OnNewGlobalHookOption

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Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.