Struct v8::ContextScope

pub struct ContextScope<'s, P> { /* private fields */ }

Stack-allocated class which sets the execution context for all operations executed within a local scope. After entering a context, all code compiled and run is compiled and run in this context.

Implementations

impl<'s, P: NewContextScope<'s>> ContextScope<'s, P>

pub fn new(param: &'s mut P, context: Local<'_, Context>) -> P::NewScope

Methods from Deref<Target = EscapableHandleScope<'p, 'e>>

pub fn escape<T>(&mut self, value: Local<'_, T>) -> Local<'e, T>

where for<'l> Local<'l, T>: Into<Local<'l, Data>>,

Pushes the value into the previous scope and returns a handle to it. Cannot be called twice.

Methods from Deref<Target = HandleScope<'s>>

pub fn get_current_context(&self) -> Local<'s, Context>

Returns the context of the currently running JavaScript, or the context on the top of the stack if no JavaScript is running.

pub fn get_entered_or_microtask_context(&self) -> Local<'s, Context>

Returns either the last context entered through V8’s C++ API, or the context of the currently running microtask while processing microtasks. If a context is entered while executing a microtask, that context is returned.

pub fn throw_exception( &mut self, exception: Local<'_, Value> ) -> Local<'s, Value>

Schedules an exception to be thrown when returning to JavaScript. When an exception has been scheduled it is illegal to invoke any JavaScript operation; the caller must return immediately and only after the exception has been handled does it become legal to invoke JavaScript operations.

This function always returns the undefined value.

pub fn get_isolate_data_from_snapshot_once<T>( &mut self, index: usize ) -> Result<Local<'s, T>, DataError>

where T: 'static, for<'l> <Local<'l, Data> as TryInto<Local<'l, T>>>::Error: ToDataError, for<'l> Local<'l, Data>: TryInto<Local<'l, T>>,

Return data that was previously attached to the isolate snapshot via SnapshotCreator, and removes the reference to it. If called again with same index argument, this function returns DataError::NoData.

The value that was stored in the snapshot must either match or be convertible to type parameter T, otherwise DataError::BadType is returned.

pub fn get_context_data_from_snapshot_once<T>( &mut self, index: usize ) -> Result<Local<'s, T>, DataError>

where T: 'static, for<'l> <Local<'l, Data> as TryInto<Local<'l, T>>>::Error: ToDataError, for<'l> Local<'l, Data>: TryInto<Local<'l, T>>,

Return data that was previously attached to the context snapshot via SnapshotCreator, and removes the reference to it. If called again with same index argument, this function returns DataError::NoData.

The value that was stored in the snapshot must either match or be convertible to type parameter T, otherwise DataError::BadType is returned.

pub fn set_promise_hooks( &mut self, init_hook: Option<Local<'_, Function>>, before_hook: Option<Local<'_, Function>>, after_hook: Option<Local<'_, Function>>, resolve_hook: Option<Local<'_, Function>> )

pub fn set_continuation_preserved_embedder_data( &mut self, data: Local<'_, Value> )

pub fn get_continuation_preserved_embedder_data(&mut self) -> Local<'s, Value>

Trait Implementations

impl<'s, 'p, 'e> AsMut<EscapableHandleScope<'p, 'e>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_mut(&mut self) -> &mut EscapableHandleScope<'p, 'e>

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsMut<EscapableHandleScope<'p, 'e, ()>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_mut(&mut self) -> &mut EscapableHandleScope<'p, 'e, ()>

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsMut<HandleScope<'p>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_mut(&mut self) -> &mut HandleScope<'p>

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p> AsMut<HandleScope<'p>> for ContextScope<'s, HandleScope<'p>>

fn as_mut(&mut self) -> &mut HandleScope<'p>

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsMut<HandleScope<'p, ()>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_mut(&mut self) -> &mut HandleScope<'p, ()>

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p> AsMut<HandleScope<'p, ()>> for ContextScope<'s, HandleScope<'p>>

fn as_mut(&mut self) -> &mut HandleScope<'p, ()>

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p, P> AsMut<Isolate> for ContextScope<'s, P>

fn as_mut(&mut self) -> &mut Isolate

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsRef<EscapableHandleScope<'p, 'e>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_ref(&self) -> &EscapableHandleScope<'p, 'e>

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsRef<EscapableHandleScope<'p, 'e, ()>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_ref(&self) -> &EscapableHandleScope<'p, 'e, ()>

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsRef<HandleScope<'p>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_ref(&self) -> &HandleScope<'p>

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, 'p> AsRef<HandleScope<'p>> for ContextScope<'s, HandleScope<'p>>

fn as_ref(&self) -> &HandleScope<'p>

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, 'p, 'e> AsRef<HandleScope<'p, ()>> for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn as_ref(&self) -> &HandleScope<'p, ()>

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, 'p> AsRef<HandleScope<'p, ()>> for ContextScope<'s, HandleScope<'p>>

fn as_ref(&self) -> &HandleScope<'p, ()>

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, 'p, P> AsRef<Isolate> for ContextScope<'s, P>

fn as_ref(&self) -> &Isolate

Converts this type into a shared reference of the (usually inferred) input type.

impl<'s, P: Debug> Debug for ContextScope<'s, P>

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

Formats the value using the given formatter.

impl<'s, 'p, 'e> Deref for ContextScope<'s, EscapableHandleScope<'p, 'e>>

type Target = EscapableHandleScope<'p, 'e>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'s, 'p> Deref for ContextScope<'s, HandleScope<'p>>

type Target = HandleScope<'p>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'s, 'p, 'e> DerefMut for ContextScope<'s, EscapableHandleScope<'p, 'e>>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'s, 'p> DerefMut for ContextScope<'s, HandleScope<'p>>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'s, 'p, P> Drop for ContextScope<'s, P>

fn drop(&mut self)

Executes the destructor for this type.