Capture all frames.
Assert that code is only ever called from a GC callback, disable the static
rooting hazard analysis and assert if any allocation that could potentially
trigger a GC occurs while this guard object is live.
Diagnostic assert (see MOZ_DIAGNOSTIC_ASSERT) that GC cannot occur while this
class is live. This class does not disable the static rooting hazard
analysis.
[SMDOC] Protecting the debuggee’s job/microtask queue from debugger activity.
Ensure that generational GC is disabled within some scope.
Pass a subclass of this “abstract” class to callees to require that they
never GC. Subclasses can use assertions or the hazard analysis to ensure no
GC happens.
Save and later restore the current exception state of a given JSContext.
This is useful for implementing behavior in C++ that’s like try/catch
or try/finally in JS.
Supply an alternative stack to incorporate into captured SavedFrame
backtraces as the imputed caller of asynchronous JavaScript calls, like async
function resumptions and DOM callbacks.
A simple RAII class that clears the registered warning reporter on
construction and restores it on destruction.
UniquePtr deleter for external buffer contents.
Data for tracking JIT-code memory usage.
Compilation options stored on the stack. An instance of this type
simply holds references to dynamically allocated resources (element;
filename; source map URL) that are owned by something else. If you
create an instance of this type, it’s up to you to guarantee that
everything you store in it will outlive it.
Custom rooting behavior for internal and external clients.
The Dispatchable interface allows the embedding to call SpiderMonkey
on a JSContext thread when requested via DispatchToEventLoopCallback.
Type representing a JS error or exception. At the moment this only
“represents” an error in a rather abstract way.
Capture the first frame with the given principals. By default, do not
consider self-hosted frames with the given principals as satisfying the stack
capture.
A convenience class for imitating a JS for-of loop. Typical usage:
A GC pointer, tagged with the trace kind.
Data for tracking GC memory usage.
Measurements that not associated with any individual runtime.
Reference to a T that has been rooted elsewhere. This is most useful
as a parameter type, which guarantees that the T lvalue is properly
rooted. See “Move GC Stack Rooting” above.
A generic handle to an array of rooted values.
Subset of CompileOptions fields used while instantiating Stencils.
Handler with callbacks for JS::ParseJSONWithHandler.
Timing information for telemetry purposes
Abstract base class for an ECMAScript Job Queue:
https://www.ecma-international.org/ecma-262/9.0/index.html#sec-jobs-and-job-queues
A saved job queue, represented however the JobQueue implementation pleases.
Use AutoDebuggerJobQueueInterruption rather than trying to construct one of
these directly; see documentation there.
Capture at most this many frames.
Similar to a handle, but the underlying storage can be changed. This is
useful for outparams.
Holds data about a notable class (one whose combined object and shape
instances use more than a certain amount of memory) so we can report it
individually.
Holds data about a notable script source file (one whose combined
script sources use more than a certain amount of memory) so we can report it
individually.
Holds data about a notable string (one which, counting all duplicates, uses
more than a certain amount of memory) so we can report it individually.
Per ES6, the [[DefineOwnProperty]] internal method has three different
possible outcomes:
The ConsumeStreamCallback is called from an active JSContext, passing a
StreamConsumer that wishes to consume the given host object as a stream of
bytes with the given MIME type. On failure, the embedding must report the
appropriate error on ‘cx’. On success, the embedding must call
consumer->consumeChunk() repeatedly on any thread until exactly one of:
Compilation options, with dynamic lifetime. An instance of this type
makes a copy of / holds / roots all dynamically allocated resources
(principals; elements; strings) that it refers to. Its destructor frees
/ drops / unroots them. This is heavier than CompileOptions, below, but
unlike CompileOptions, it can outlive any given stack frame.
A copyable, assignable global GC root type with arbitrary lifetime, an
infallible constructor, and automatic unrooting on destruction.
A structure that represents a property on an object, or the absence of a
property. Use {,Mutable}Handle
to interact with
instances of this structure rather than interacting directly with member
fields.The class representing a full set of compile options.
Subset of CompileOptions fields used while decoding Stencils.
Abstract base class for external underlying sources.
RealmBehaviors specifies behaviors of a realm that can be changed after the
realm’s been created.
RealmCreationOptions specifies options relevant to creating a new realm, that
are either immutable characteristics of that realm or that are discarded
after the realm has been created.
RealmOptions specifies realm characteristics: both those that can’t be
changed on a realm once it’s been created (RealmCreationOptions), and those
that can be changed on an existing realm (RealmBehaviors).
Regular expression flag values, suitable for initializing a collection of
regular expression flags as defined below in |RegExpFlags|. Flags are listed
in alphabetical order by syntax – /d, /g, /i, /m, /s, /u, /v, /y.
A collection of regular expression flags. Individual flag values may be
combined into a collection using bitwise operators.
These measurements relate directly to the JSRuntime, and not to zones,
compartments, and realms within it.
SafelyInitialized::create() creates a safely-initialized |T|, suitable for
use as a default value in situations requiring a safe but arbitrary |T|
value. Implemented as a static method of a struct to allow partial
specialization for subclasses via the Enable template parameter.
This class holds information about the memory taken up by script sources
from a particular file.
These are the measurements used by Servo.
This class holds information about the memory taken up by identical copies of
a particular string. Multiple JSStrings may have their sizes aggregated
together into one StringInfo object. Note that two strings with identical
chars will not be aggregated together if one is a short string and the other
is not.
The TenuredHeap class is similar to the Heap class above in that it
encapsulates the GC concerns of an on-heap reference to a JS object. However,
it has two important differences:
The common base class for the CompileOptions hierarchy.
[SMDOC] JS::Value type
The WasmModule interface allows the embedding to hold a reference to the
underying C++ implementation of a JS WebAssembly.Module object for purposes
of efficient postMessage() and (de)serialization from a random thread.
If IsIncrementalGCInProgress(cx), this call aborts the ongoing collection and
performs whatever work needs to be done to return the collector to its idle
state. This may take an arbitrarily long time. When this function returns,
IsIncrementalGCInProgress(cx) will always be false.
Advise the GC of external memory owned by a JSObject. This is used to
determine when to collect zones. Calls must be matched by calls to
RemoveAssociatedMemory() when the memory is deallocated or no longer owned by
the object.
Add and remove nursery collection callbacks for the given runtime. These will
be called at the start and end of every nursery collection.
Unforgeable, optimized version of the JS builtin Promise.prototype.then.
Unforgeable, optimized version of the JS builtin Promise.prototype.then.
Copy data from one array buffer to another.
Copy data from one array buffer to another.
Return true if the ArrayBuffer |obj| contains any data, i.e. it is not a
detached ArrayBuffer. (ArrayBuffer.prototype is not an ArrayBuffer.)
Asserts (in debug and release builds) that obj belongs to the current
thread’s context.
Same as BigIntFits(), but checks if the value fits inside a JS Number value.
Return true if the given BigInt is negative.
Convert the given BigInt to a Number value as if calling the Number
constructor on it
(https://tc39.es/ecma262/#sec-number-constructor-number-value). The value
may be rounded if it doesn’t fit without loss of precision.
Convert the given BigInt to a String value as if toString() were called on
it.
Given a SavedFrame JSObject stack, stringify it in the same format as
Error.prototype.stack. The stringified stack out parameter is placed in the
cx’s compartment. Defaults to the empty string.
Calls the current compartment’s original Promise.reject on the original
Promise constructor, with resolutionValue passed as an argument.
Calls the current compartment’s original Promise.resolve on the original
Promise constructor, with resolutionValue passed as an argument.
Create a Promise with the given fulfill/reject handlers, that will be
fulfilled/rejected with the value/reason that the promise promise is
fulfilled/rejected with.
Capture the current call stack as a chain of SavedFrame JSObjects, and set
|stackp| to the SavedFrame for the youngest stack frame, or nullptr if there
are no JS frames on the stack.
Check whether the given source is a valid regexp. If the regexp parses
successfully, returns true and sets |error| to undefined. If the regexp
has a syntax error, returns true, sets |error| to that error object, and
clears the exception. Returns false on OOM or over-recursion.
Clear kept alive objects in JS WeakRef.
https://tc39.es/proposal-weakrefs/#sec-clear-kept-objects
Clear the private value associated with a source text module record.
Compile the provided script using the given options. Return the script on
success, or return null on failure (usually with an error reported).
Compile the provided script using the given options. Return the script on
success, or return null on failure (usually with an error reported).
Compile a function with envChain plus the global as its scope chain.
envChain must contain objects in the current compartment of cx. The actual
scope chain used for the function will consist of With wrappers for those
objects, followed by the current global of the compartment cx is in. This
global must not be explicitly included in the scope chain.
Compile a function with envChain plus the global as its scope chain.
envChain must contain objects in the current compartment of cx. The actual
scope chain used for the function will consist of With wrappers for those
objects, followed by the current global of the compartment cx is in. This
global must not be explicitly included in the scope chain.
Identical to the CompileFunction overload above for UTF-8, but with
Rust-friendly ergonomics.
Parse the given source buffer as a JSON module in the scope of the current
global of cx and return a synthetic module record.
Parse the given source buffer as a module in the scope of the current global
of cx and return a source text module record.
Parse the given source buffer as a module in the scope of the current global
of cx and return a source text module record. An error is reported if a
UTF-8 encoding error is encountered.
Compile the UTF-8 contents of the given file into a script. It is an error
if the file contains invalid UTF-8. Return the script on success, or return
null on failure (usually with an error reported).
Compile the UTF-8 contents of the file at the given path into a script.
(The path itself is in the system encoding, not [necessarily] UTF-8.) It
is an error if the file’s contents are invalid UTF-8. Return the script on
success, or return null on failure (usually with an error reported).
Invoke a constructor. This is the C++ equivalent of
rval = Reflect.construct(fun, args, newTarget).
Invoke a constructor. This is the C++ equivalent of
rval = new fun(...args).
Returns true if there are any live SharedArrayBuffer objects, including those
for wasm memories, associated with the context. This is conservative,
because it does not run GC. Some dead objects may not have been collected
yet and thus will be thought live.
Given a SavedFrame object, convert it and its transitive parents to plain
objects. Because SavedFrame objects store their properties on the prototype,
they cannot be usefully stringified to JSON. Assigning their properties to
plain objects allow those objects to be stringified and the saved frame stack
can be encoded as a string.
Create a new ArrayBuffer, whose bytes are set to the values of the bytes in
the provided ArrayBuffer.
Create memory mapped ArrayBuffer contents.
Caller must take care of closing fd after calling this function.
Get the current realm’s global. Returns nullptr if no realm has been
entered.
Detach an ArrayBuffer, causing all associated views to no longer refer to
the ArrayBuffer’s original attached memory.
Incremental GC defaults to enabled, but may be disabled for testing or in
embeddings that have not yet implemented barriers on their native classes.
There is not currently a way to re-enable incremental GC once it has been
disabled on the runtime.
Attempt to disable Wasm’s usage of reserving a large virtual memory
allocation to avoid bounds checking overhead. This must be called before any
Wasm module or memory is created in this process, or else this function will
fail.
Encode a narrow multibyte character string to a UTF-8 string.
Encode a UTF-8 string to a narrow multibyte character string.
Encode a UTF-8 string to a wide string.
Encode a wide string to a UTF-8 string.
NB: This API is infallible; a nullptr return value does not indicate error.
Evaluate the given source buffer in the scope of the current global of cx,
and return the completion value in |rval|.
As above, but providing an explicit scope chain. envChain must not include
the global object on it; that’s implicit. It needs to contain the other
objects that should end up on the script’s scope chain.
Evaluate the provided UTF-8 data in the scope of the current global of |cx|,
and return the completion value in |rval|. If the data contains invalid
UTF-8, an error is reported.
Evaluate the UTF-8 contents of the file at the given path, and return the
completion value in |rval|. (The path itself is UTF-8 encoded, too.) If
the contents contain any malformed UTF-8, an error is reported.
If the given object is an exception object (or an unwrappable
cross-compartment wrapper for one), return the stack for that exception, if
any. Will return null if the given object is not an exception object
(including if it’s null or a security wrapper that can’t be unwrapped) or if
the exception has no stack.
Execute a regexp on a given input, starting from |indexp|.
Returns false on OOM or over-recursion.
Execute a regexp on a given input, starting from |indexp|.
This is the same as ExecuteRegExp, except it does not update the RegExp
statics and can be called without a global object.
Get a statically allocated C string explaining the given GC reason.
This must be called after a dynamic import operation is complete.
If IsIncrementalGCInProgress(cx), this call finishes the ongoing collection
by performing an arbitrarily long slice. If !IsIncrementalGCInProgress(cx),
this is equivalent to NonIncrementalGC. When this function returns,
IsIncrementalGCInProgress(cx) will always be false.
Set all of the uninitialized lexicals on an object to undefined. Return
true if any lexicals were initialized and false otherwise.
Returns the base size in bytes of the GC thing of kind |kind|.
Returns a static string equivalent of |kind|.
Return the available byte length of an ArrayBuffer.
Return a pointer to the start of the data referenced by a typed array. The
data is still owned by the typed array, and should not be modified on
another thread. Furthermore, the pointer can become invalid on GC (if the
data is small and fits inside the array’s GC header), so callers must take
care not to hold on across anything that could GC.
Return a pointer to the start of the array buffer’s data, and indicate
whether the data is from a shared array buffer through an outparam.
Get the length, sharedness, and data from an ArrayBufferMaybeShared subtypes.
Store |*lengthp = ToLength(obj.length)| and return true on success, else
return false.
Determine the ECMAScript “class” – Date, String, RegExp, and all the other
builtin object types (described in ECMAScript in terms of an objecting having
“an [[ArrayBufferData]] internal slot” or similar language for other kinds of
object – of the provided object.
If args.get(0) is one of the strings “string”, “number”, or “default”, set
result to JSTYPE_STRING, JSTYPE_NUMBER, or JSTYPE_UNDEFINED accordingly and
return true. Otherwise, return false with a TypeError pending.
Get the HostImportModuleDynamically hook for the runtime.
Get the hook for populating the import.meta metadata object.
Get the HostResolveImportedModule hook for the runtime.
Get the global object associated with an object’s realm. The object must not
be a cross-compartment wrapper (because CCWs are shared by all realms in the
compartment).
Attempt to unwrap |obj| as an ArrayBuffer.
Returns a js::SavedFrame linked list of the stack that lead to the given
Promise’s allocation.
Returns the current compartment’s original Promise constructor.
Returns the given Promise’s process-unique ID.
Returns whether the given promise’s rejection is already handled or not.
Returns the current compartment’s original Promise.prototype.
Returns the given Promise’s state as a JS::PromiseState enum value.
Returns the given Promise’s activation behavior state flag per above as a
JS::PromiseUserInputEventHandlingState value. All promises are created with
the DontCare state by default.
Return the source text for a RegExp object (or a wrapper around one), or null
on failure.
Given a SavedFrame JSObject, get its asyncCause string. Defaults to nullptr.
Given a SavedFrame JSObject, get its asyncParent SavedFrame object or nullptr
if there is no asyncParent. The asyncParentp out parameter is NOT
guaranteed to be in the cx’s compartment. Defaults to nullptr.
Given a SavedFrame JSObject, get its column property. Defaults to 0.
Given a SavedFrame JSObject, get its functionDisplayName string, or nullptr
if SpiderMonkey was unable to infer a name for the captured frame’s
function. Defaults to nullptr.
Given a SavedFrame JSObject, get its line property (1-origin).
Defaults to 0.
Given a SavedFrame JSObject, get its parent SavedFrame object or nullptr if
it is the oldest frame in the stack. The parentp out parameter is NOT
guaranteed to be in the cx’s compartment. Defaults to nullptr.
Given a SavedFrame JSObject, get its source property. Defaults to the empty
string.
Given a SavedFrame JSObject, get an ID identifying its ScriptSource.
Defaults to 0.
Return the SymbolCode telling what sort of symbol symbol is.
Get the [[Description]] attribute of the given symbol.
Symbol.for as specified in ES6.
Unforgeable version of the JS builtin Promise.all.
Get one of the well-known symbols defined by ES6. A single set of well-known
symbols is shared by all compartments in a JSRuntime.
Get one of the well-known symbols defined by ES6 as PropertyKey. This is
equivalent to calling JS::GetWellKnownSymbol and then creating a PropertyKey.
Informs the JS engine that the scripted caller should be hidden. This can be
used by the embedding to maintain an override of the scripted caller in its
calculations, by hiding the scripted caller in the JS engine and pushing data
onto a separate stack, which it inspects when DescribeScriptedCaller returns
null.
Return whether an incremental GC has work to do on the foreground thread and
would make progress if a slice was run now. If this returns false then the GC
is waiting for background threads to finish their work and a slice started
now would return immediately.
Perform a slice of an ongoing incremental collection. When this function
returns, the collection may not be complete. It must be called repeatedly
until !IsIncrementalGCInProgress(cx).
Return true if the GC reason is internal to the JS engine.
ES6 7.2.2.
Identical to IsArray above, but the nature of the object (if successfully
determined) is communicated via |*answer|. In particular this method
returns true and sets |*answer = IsArrayAnswer::RevokedProxy| when called on
a revoked proxy.
Check whether obj supports the JS::GetArrayBufferMaybeShared* APIs. Note
that this may return false if a security wrapper is encountered that denies
the unwrapping. If this test succeeds, then it is safe to call the various
predicate and accessor JSAPI calls defined below.
Return the isShared flag of a ArrayBufferView subtypes, which denotes whether
the underlying buffer is a SharedArrayBuffer.
Determine whether |value| is an Array object or a wrapper around one. (An
ES6 proxy whose target is an Array object, e.g.
|var target = [], handler = {}; Proxy.revocable(target, handler).proxy|, is
not considered to be an Array.)
Determine whether |obj| is an Array object or a wrapper around one. (An
ES6 proxy whose target is an Array object, e.g.
|var target = [], handler = {}; Proxy.revocable(target, handler).proxy|, is
not considered to be an Array.)
Returns true if capturing stack trace data to associate with an asynchronous
operation is currently enabled for the current context realm.
Return true if the given object is callable. In ES6 terms, an object is
callable if it has a [
Call] internal method.
Return true if the given object is a constructor. In ES6 terms, an object is
a constructor if it has a [
Construct] internal method. The expression
new obj() throws a TypeError if obj is not a constructor.
Check whether the obj is a detached ArrayBufferObject. Note that this may
return false if a security wrapper is encountered that denies the
unwrapping.
Whether we are poisoning unused/released data for error detection. Governed
by the JS_GC_ALLOW_EXTRA_POISONING #ifdef as well as the
javascript.options.extra_gc_poisoning pref.
Returns true if any zone in the system has been scheduled for GC with one of
the functions above or by the JS engine.
Returns true if generational allocation and collection is currently enabled
on the given runtime.
Returns true if incremental GC is enabled. Simply having incremental GC
enabled is not sufficient to ensure incremental collections are happening.
See the comment “Incremental GC” above for reasons why incremental GC may be
suppressed. Inspection of the “nonincremental reason” field of the
GCDescription returned by GCSliceCallback may help narrow down the cause if
collections are not happening incrementally when expected.
Returns true while an incremental GC is ongoing, both when actively
collecting and between slices.
Returns true while an incremental GC is ongoing, both when actively
collecting and between slices.
Returns whether the passed array buffer is ‘large’: its byteLength >= 2 GB.
On success, returns true, setting |*isMap| to true if |obj| is a Map object
or a wrapper around one, or to false if not. Returns false on failure.
Check whether the obj is ArrayBufferObject and memory mapped. Note that this
may return false if a security wrapper is encountered that denies the
unwrapping.
Return true iff the given object is either a SavedFrame object or wrapper
around a SavedFrame object, and it is not the SavedFrame.prototype object.
Returns true if the given object is an unwrapped PromiseObject, false
otherwise.
Returns true if the given object is a ReadableStream object or an
unwrappable wrapper for one, false otherwise.
Returns true if the given object is a ReadableStreamDefaultReader object
or an unwrappable wrapper for one, false otherwise.
Returns true if the given object is a ReadableStreamDefaultReader or
ReadableStreamBYOBReader object or an unwrappable wrapper for one, false
otherwise.
Returns whether the passed array buffer is resizable or growable for shared
array buffers.
On success, returns true, setting |*isSet| to true if |obj| is a Set object
or a wrapper around one, or to false if not. Returns false on failure.
Check whether obj supports the JS::GetSharedArrayBuffer* APIs. Note that
this may return false if a security wrapper is encountered that denies the
unwrapping. If this test succeeds, then it is safe to call the various
accessor JSAPI calls defined below.
Return true iff the given object is a SavedFrame object and not the
SavedFrame.prototype object.
Returns true if the given text is valid JSON.
This function calls |realmCallback| on every realm. Beware that there is no
guarantee that the realm will survive after the callback returns. Also,
barriers are disabled via the TraceSession.
Like IterateRealms, but only iterates realms in |compartment|.
Like IterateRealms, but only call the callback for realms using |principals|.
Inform the runtime that the job queue is empty and the embedding is going to
execute its last promise job. The runtime may now choose to skip creating
promise jobs for asynchronous execution and instead continue execution
synchronously. More specifically, this optimization is used to skip the
standard job queuing behavior for await operations in async functions.
Inform the runtime that job queue is no longer empty. The runtime can now no
longer skip creating promise jobs for asynchronous execution, because
pending jobs in the job queue must be executed first to preserve the FIFO
(first in - first out) property of the queue. This effectively undoes
JobQueueIsEmpty and re-enables the standard job queuing behavior.
Store |v1 == v2| to |*equal| – loose equality, which may perform
user-modifiable conversions on |v1| or |v2|.
Check whether the nursery should be eagerly collected as per WantEagerMajorGC
above, and if so run a collection.
Create a new ArrayBuffer with the given byte length.
Create a new ArrayBuffer with the given non-null |contents|.
Create an Array from the current realm with the given contents.
Create an Array from the current realm with the given length and allocate
memory for all its elements. (The elements nonetheless will not exist as
properties on the returned array until values have been assigned to them.)
Create a new Date object for a year/month/day-of-month/hour/minute/second.
Create a new function based on the given JSFunctionSpec, *fs.
id is the result of a successful call to
PropertySpecNameToId(cx, fs->name, &id) or
PropertySpecNameToPermanentId(cx, fs->name, &id).
Same as above, but without an id arg, for callers who don’t have
the id already.
Create a new mapped ArrayBuffer with the given memory mapped contents. It
must be legal to free the contents pointer by unmapping it. On success,
ownership is transferred to the new mapped ArrayBuffer.
Returns a new instance of the Promise builtin class in the current
compartment, with the right slot layout.
Returns a new instance of the ReadableStream builtin class in the current
compartment, configured as a default stream.
If a |proto| is passed, that gets set as the instance’s [[Prototype]]
instead of the original value of |ReadableStream.prototype|.
Returns a new instance of the ReadableStream builtin class in the current
compartment.
Create a new RegExp for the given Latin-1-encoded bytes and flags.
Create a new SharedArrayBuffer with the given byte length. This
may only be called if
JS::RealmCreationOptionsRef(cx).getSharedMemoryAndAtomicsEnabled() is
true.
Create a new Symbol with the given description. This function never returns
a Symbol that is in the Runtime-wide symbol registry.
Create a new RegExp for the given source and flags.
Performs a non-incremental collection of all selected zones.
Create a BigInt from a floating-point value. If the number isn’t integral
(that is, if it’s NaN, an infinity, or contains a fractional component),
this function returns null and throws an exception.
On success, returns true, setting |*isDate| to true if |obj| is a Date
object or a wrapper around one, or to false if not. Returns false on
failure.
On success, returns true, setting |*isRegExp| to true if |obj| is a RegExp
object or a wrapper around one, or to false if not. Returns false on
failure.
ES6 draft 20141224, 7.1.1, second algorithm.
Performs the JSON.parse operation as specified by ECMAScript, and call
callbacks defined by the handler.
Schedule all zones to be collected in the next GC.
When performing an incremental GC, the zones that were selected for the
previous incremental slice must be selected in subsequent slices as well.
This function selects those slices automatically.
Schedule the given zone to be collected as part of the next GC.
Create a jsid that does not need to be marked for GC.
Cancels the given ReadableStream with the given reason and returns a
Promise resolved according to the result.
Close the given ReadableStream. This is equivalent to controller.close()
in JS.
Enqueues the given chunk in the given ReadableStream.
Errors the given ReadableStream, causing all future interactions to fail
with the given error value.
Retrieves the desired combined size of additional chunks to fill the given
ReadableStream’s queue. Stores the result in |value| and sets |hasValue| to
true on success, returns false on failure.
Returns the embedding-provided underlying source of the given |stream|.
Returns the stream’s ReadableStreamMode. If the mode is |Byte| or
|ExternalSource|, it’s possible to acquire a BYOB reader for more optimized
operations.
Creates a reader of the type specified by the mode option and locks the
stream to the new reader.
Returns true if the given ReadableStream is disturbed, false if not.
Returns true if the given ReadableStream is locked, false if not.
Returns true if the given ReadableStream is readable, false if not.
Returns true if the given ReadableStream reader is locked, false otherwise.
Break the cycle between this object and the
nsISupportsObject_alreadyAddreffed passed in
NewReadableExternalSourceStreamObject().
Releases the embedding-provided underlying source of the given |stream|,
returning the stream into an unlocked state.
Tees the given ReadableStream and stores the two resulting streams in
outparams. Returns false if the operation fails, e.g. because the stream is
locked.
Update the amount of data available at the underlying source of the given
|stream|.
Rejects the given promise with the given rejectionValue.
Release the allocated resource of mapped ArrayBuffer contents before the
object is created.
If a new object has been created by JS::NewMappedArrayBufferWithContents()
with this content, then JS::DetachArrayBuffer() should be used instead to
release the resource used by the object.
Advise the GC that external memory reported by JS::AddAssociatedMemory() is
no longer owned by a JSObject. Calls must match those to
AddAssociatedMemory().
Re-query the system to determine the current time zone adjustment from UTC,
including any component due to DST. If the time zone has changed, this will
cause all Date object non-UTC methods and formatting functions to produce
appropriately adjusted results.
Resolves the given Promise with the given resolutionValue.
Stores |SameValue(v1, v2)| to |*equal| – using the SameValue operation
defined in ECMAScript, initially exposed to script as |Object.is|. SameValue
behaves identically to strict equality, except that it equates two NaN values
and does not equate differently-signed zeroes. It performs no conversions on
|v1| or |v2| before comparing.
Perform |obj.length = length| as if in strict mode code, with a fast path for
the case where |obj| is an Array.
Transition the cx to a mode where failures that would normally cause a false
return value will instead crash with a diagnostic assertion.
Called when generating a GC slice budget. It allows the embedding to control
the duration of slices and potentially check an interrupt flag as well. For
internally triggered GCs, the given millis parameter is the JS engine’s
internal scheduling decision, which the embedding can choose to ignore.
(Otherwise, it will be the value that was passed to eg
JS::IncrementalGCSlice()).
The purge gray callback is called after any COMPARTMENT_REVIVED GC in which
the majority of compartments have been marked gray.
The GC slice callback is called at the beginning and end of each slice. This
callback may be used for GC notifications as well as to perform additional
marking.
Tell SpiderMonkey to use queue to schedule promise reactions.
Set the HostImportModuleDynamically hook for the runtime to the given
function.
Set the hook for populating the import.meta metadata object to the given
function.
Set a private value associated with a source text module record.
Set the HostResolveImportedModule hook for the runtime to the given function.
Embedder hook to set the buildId-generating function.
Tell JS engine whether Profile Timeline Recording is enabled or not.
If Profile Timeline Recording is enabled, data shown there like stack won’t
be optimized out.
This is global state and not associated with specific runtime or context.
Sets the callback that’s invoked whenever a Promise is rejected without
a rejection handler, and when a Promise that was previously rejected
without a handler gets a handler attached.
Sets the given Promise’s activation behavior state flag per above as a
JS::PromiseUserInputEventHandlingState value.
Set a private value associated with a script. Note that this value is shared
by all nested scripts compiled from a single source file.
Set the script private finalize hook for the runtime to the given function.
When a JSRuntime is destroyed it implicitly cancels all async tasks in
progress, releasing any roots held by the task. However, this is not soon
enough for cycle collection, which needs to have roots dropped earlier so
that the cycle collector can transitively remove roots for a future GC. For
these and other cases, the set of pending async tasks can be canceled
with this call earlier than JSRuntime destruction.
Create a BigInt by parsing a string consisting of an optional sign character
followed by one or more alphanumeric ASCII digits in the provided radix.
Undoes the effect of the Prepare methods above. The given zone will not be
collected in the next GC.
Begin an incremental collection and perform one slice worth of work. When
this function returns, the collection may not be complete.
IncrementalGCSlice() must be called repeatedly until
!IsIncrementalGCInProgress(cx).
Steal the contents of the given ArrayBuffer. The ArrayBuffer has its length
set to 0 and its contents array cleared. The caller takes ownership of the
return value and must free it or transfer ownership via
JS::NewArrayBufferWithContents when done using it.
Store |v1 === v2| to |*equal| – strict equality, which performs no
conversions on |v1| or |v2| before comparing.
Create a BigInt by parsing a string using the ECMAScript StringToBigInt
algorithm (https://tc39.es/ecma262/#sec-stringtobigint). Latin1 and two-byte
character ranges are supported. It may be convenient to use
JS::ConstLatin1Chars or JS::ConstTwoByteChars.
Convert a JS::Value to a BigInt using the ECMAScript ToBigInt algorithm
(https://tc39.es/ecma262/#sec-tobigint).
Convert the given BigInt, modulo 2**64, to a signed 64-bit integer.
Convert the given BigInt, modulo 2**64, to an unsigned 64-bit integer.
Generate getter/setter id for given id, by adding “get “ or “set “ prefix.
Performs the JSON.stringify operation, as specified by ECMAScript, except
writing stringified data by one call of |callback|, passing |data| as
argument.
An API akin to JS_Stringify but with the goal of not having observable
side-effects when the stringification is performed. This means it does not
allow a replacer or a custom space and has the following constraints on its
input:
Convert obj to a primitive value. On success, store the result in vp and
return true.
Unsets the gray bit for anything reachable from |thing|. |kind| should not be
JS::TraceKind::Shape. |thing| should be non-null. The return value indicates
if anything was unmarked.
Check whether the nursery should be eagerly collected, this is before it is
full.
Report a warning represented by the sprintf-like conversion of ASCII format
filled from trailing ASCII arguments.
Report a warning represented by the sprintf-like conversion of Latin-1 format
filled from trailing Latin-1 arguments.
Report a warning represented by the sprintf-like conversion of UTF-8 format
filled from trailing UTF-8 arguments.
Returns true if the most recent GC ran incrementally.