Crate v8

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§Example

let platform = v8::new_default_platform(0, false).make_shared();
v8::V8::initialize_platform(platform);
v8::V8::initialize();

let isolate = &mut v8::Isolate::new(Default::default());

let scope = &mut v8::HandleScope::new(isolate);
let context = v8::Context::new(scope, Default::default());
let scope = &mut v8::ContextScope::new(scope, context);

let code = v8::String::new(scope, "'Hello' + ' World!'").unwrap();
println!("javascript code: {}", code.to_rust_string_lossy(scope));

let script = v8::Script::compile(scope, code, None).unwrap();
let result = script.run(scope).unwrap();
let result = result.to_string(scope).unwrap();
println!("result: {}", result.to_rust_string_lossy(scope));

Re-exports§

Modules§

  • V8
  • cppgc
  • fast_api
  • icu
  • inspector
    Bindings to the V8 Inspector API. Documentation for the V8 inspector API is very sparse, so here are a few references for the next sorry soul who has to dig into it.
  • json
    A JSON Parser and Stringifier.
  • script_compiler

Structs§

  • AccessorConfiguration
  • AccessorSignature
    An AccessorSignature specifies which receivers are valid parameters to an accessor callback.
  • Allocator
    A thread-safe allocator that V8 uses to allocate |ArrayBuffer|’s memory. The allocator is a global V8 setting. It has to be set via Isolate::CreateParams.
  • AllowJavascriptExecutionScope
  • Array
    An instance of the built-in array constructor (ECMA-262, 15.4.2).
  • ArrayBuffer
    An instance of the built-in ArrayBuffer constructor (ES6 draft 15.13.5).
  • ArrayBufferView
    A base class for an instance of one of “views” over ArrayBuffer, including TypedArrays and DataView (ES6 draft 15.13).
  • BackingStore
    A wrapper around the backing store (i.e. the raw memory) of an array buffer. See a document linked in http://crbug.com/v8/9908 for more information.
  • BigInt
    A JavaScript BigInt value (https://tc39.github.io/proposal-bigint)
  • BigInt64Array
    An instance of BigInt64Array constructor.
  • BigIntObject
    A BigInt object (https://tc39.github.io/proposal-bigint)
  • BigUint64Array
    An instance of BigUint64Array constructor.
  • Boolean
    A primitive boolean value (ECMA-262, 4.3.14). Either the true or false value.
  • BooleanObject
    A Boolean object (ECMA-262, 4.3.15).
  • CallbackScope
    A CallbackScope can be used to bootstrap a HandleScope and ContextScope inside a callback function that gets called by V8. Bootstrapping a scope inside a callback is the only valid use case of this type; using it in other places leads to undefined behavior, which is also the reason CallbackScope::new() is marked as being an unsafe function.
  • CompiledWasmModule
    Wrapper around a compiled WebAssembly module, which is potentially shared by different WasmModuleObjects.
  • Context
    A sandboxed execution context with its own set of built-in objects and functions.
  • ContextOptions
  • ContextScope
    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.
  • CreateParams
    Initial configuration parameters for a new Isolate.
  • Data
    The superclass of objects that can reside on V8’s heap.
  • DataView
    An instance of DataView constructor (ES6 draft 15.13.7).
  • Date
    An instance of the built-in Date constructor (ECMA-262, 15.9).
  • DisallowJavascriptExecutionScope
  • EscapableHandleScope
    A HandleScope which first allocates a handle in the current scope which will be later filled with the escape value.
  • Exception
    Create new error objects by calling the corresponding error object constructor with the message.
  • External
    A JavaScript value that wraps a C++ void*. This type of value is mainly used to associate C++ data structures with JavaScript objects.
  • ExternalReferences
  • FixedArray
    A fixed-sized array with elements of type Data.
  • Float32Array
    An instance of Float32Array constructor (ES6 draft 15.13.6).
  • Float64Array
    An instance of Float64Array constructor (ES6 draft 15.13.6).
  • Function
    A JavaScript function object (ECMA-262, 15.3).
  • FunctionBuilder
    A builder to construct the properties of a Function or FunctionTemplate.
  • FunctionCallbackArguments
  • FunctionCallbackInfo
    The argument information given to function call callbacks. This class provides access to information about the context of the call, including the receiver, the number and values of arguments, and the holder of the function.
  • FunctionTemplate
    A FunctionTemplate is used to create functions at runtime. There can only be one function created from a FunctionTemplate in a context. The lifetime of the created function is equal to the lifetime of the context. So in case the embedder needs to create temporary functions that can be collected using Scripts is preferred.
  • GCCallbackFlags
    GCCallbackFlags is used to notify additional information about the GC callback.
  • GCType
    Applications can register callback functions which will be called before and after certain garbage collection operations. Allocations are not allowed in the callback functions, you therefore cannot manipulate objects (set or delete properties for example) since it is possible such operations will result in the allocation of objects.
  • GetPropertyNamesArgs
  • GetPropertyNamesArgsBuilder
  • Global
    An object reference that is independent of any handle scope. Where a Local handle only lives as long as the HandleScope in which it was allocated, a global handle remains valid until it is dropped.
  • HandleScope
    A stack-allocated class that governs a number of local handles. After a handle scope has been created, all local handles will be allocated within that handle scope until either the handle scope is deleted or another handle scope is created. If there is already a handle scope and a new one is created, all allocations will take place in the new handle scope until it is deleted. After that, new handles will again be allocated in the original handle scope.
  • HeapStatistics
    Collection of V8 heap information.
  • IndexedPropertyHandlerConfiguration
  • Int8Array
    An instance of Int8Array constructor (ES6 draft 15.13.6).
  • Int32
    A JavaScript value representing a 32-bit signed integer.
  • Int16Array
    An instance of Int16Array constructor (ES6 draft 15.13.6).
  • Int32Array
    An instance of Int32Array constructor (ES6 draft 15.13.6).
  • Integer
    A JavaScript value representing a signed integer.
  • Isolate
    Isolate represents an isolated instance of the V8 engine. V8 isolates have completely separate states. Objects from one isolate must not be used in other isolates. The embedder can create multiple isolates and use them in parallel in multiple threads. An isolate can be entered by at most one thread at any given time. The Locker/Unlocker API must be used to synchronize.
  • IsolateHandle
    IsolateHandle is a thread-safe reference to an Isolate. It’s main use is to terminate execution of a running isolate from another thread.
  • Local
    An object reference managed by the v8 garbage collector.
  • Location
    A location in JavaScript source.
  • Map
    An instance of the built-in Map constructor (ECMA-262, 6th Edition, 23.1.1).
  • Message
    An error message.
  • MessageErrorLevel
  • MicrotaskQueue
    Represents the microtask queue, where microtasks are stored and processed. https://html.spec.whatwg.org/multipage/webappapis.html#microtask-queue https://html.spec.whatwg.org/multipage/webappapis.html#enqueuejob(queuename,-job,-arguments) https://html.spec.whatwg.org/multipage/webappapis.html#perform-a-microtask-checkpoint
  • Module
    A compiled JavaScript module.
  • ModuleRequest
  • Name
    A superclass for symbols and strings.
  • NamedPropertyHandlerConfiguration
  • Number
    A JavaScript number value (ECMA-262, 4.3.20)
  • NumberObject
    A Number object (ECMA-262, 4.3.21).
  • Object
    A JavaScript object (ECMA-262, 4.3.3)
  • ObjectTemplate
    An ObjectTemplate is used to create objects at runtime.
  • OneByteConst
    A static ASCII string resource for usage in V8, created at build time.
  • OomDetails
  • OwnedIsolate
    Same as Isolate but gets disposed when it goes out of scope.
  • Platform
  • Primitive
    The superclass of primitive values. See ECMA-262 4.3.2.
  • PrimitiveArray
    An array to hold Primitive values. This is used by the embedder to pass host defined options to the ScriptOptions during compilation.
  • Private
    A private symbol
  • Promise
    An instance of the built-in Promise constructor (ES6 draft).
  • PromiseRejectMessage
  • PromiseResolver
  • PropertyAttribute
  • PropertyCallbackArguments
  • PropertyCallbackInfo
    The information passed to a property callback about the context of the property access.
  • PropertyDescriptor
  • PropertyFilter
  • PropertyHandlerFlags
  • Proxy
    An instance of the built-in Proxy constructor (ECMA-262, 6th Edition, 26.2.1).
  • RegExp
    An instance of the built-in RegExp constructor (ECMA-262, 15.10).
  • ResolveModuleCallbackRet
    Called during Module::instantiate_module. Provided with arguments: (context, specifier, import_assertions, referrer). Return None on error.
  • ReturnValue
  • RustAllocatorVtable
    A wrapper around the V8 Allocator class.
  • Script
    A compiled JavaScript script, tied to a Context which was active when the script was compiled.
  • ScriptOrModule
    A container type that holds relevant metadata for module loading.
  • ScriptOrigin
    The origin, within a file, of a script.
  • Set
    An instance of the built-in Set constructor (ECMA-262, 6th Edition, 23.2.1).
  • SharedArrayBuffer
    An instance of the built-in SharedArrayBuffer constructor.
  • SharedPtr
    Wrapper around a C++ shared_ptr. A shared_ptr may be be null.
  • SharedRef
    Wrapper around a C++ shared_ptr. The shared_ptr is assumed to contain a value and may not be null.
  • Signature
    A Signature specifies which receiver is valid for a function.
  • StackFrame
    A single JavaScript stack frame.
  • StackTrace
    Representation of a JavaScript stack trace. The information collected is a snapshot of the execution stack and the information remains valid after execution continues.
  • StalledTopLevelAwaitMessage
  • StartupData
  • String
    A JavaScript string value (ECMA-262, 4.3.17).
  • StringObject
    A String object (ECMA-262, 4.3.18).
  • Symbol
    A JavaScript symbol (ECMA-262 edition 6)
  • SymbolObject
    A Symbol object (ECMA-262 edition 6).
  • SyntheticModuleEvaluationStepsRet
  • Template
    The superclass of object and function templates.
  • TracedReference
    A traced handle without destructor that clears the handle. The embedder needs to ensure that the handle is not accessed once the V8 object has been reclaimed. For more details see BasicTracedReference.
  • TryCatch
    An external exception handler.
  • TypedArray
    A base class for an instance of TypedArray series of constructors (ES6 draft 15.13.6).
  • Uint8Array
    An instance of Uint8Array constructor (ES6 draft 15.13.6).
  • Uint8ClampedArray
    An instance of Uint8ClampedArray constructor (ES6 draft 15.13.6).
  • Uint32
    A JavaScript value representing a 32-bit unsigned integer.
  • Uint16Array
    An instance of Uint16Array constructor (ES6 draft 15.13.6).
  • Uint32Array
    An instance of Uint32Array constructor (ES6 draft 15.13.6).
  • UnboundModuleScript
    A compiled JavaScript module, not yet tied to a Context.
  • UnboundScript
    A compiled JavaScript script, not yet tied to a Context.
  • UniquePtr
    Pointer to object allocated on the C++ heap. The pointer may be null.
  • UniqueRef
    Pointer to object allocated on the C++ heap. The pointer may not be null.
  • Value
    The superclass of all JavaScript values and objects.
  • ValueDeserializer
    ValueDeserializer is a stack object used as entry-point for an owned and pinned heap object ValueDeserializerHeap. The ’a lifetime is the lifetime of the ValueDeserializerImpl implementation. The ’s lifetime is the lifetime of the HandleScope which is used to retrieve a Local<’s, Context> for the CallbackScopes
  • ValueSerializer
  • ValueView
    Returns a view onto a string’s contents.
  • WasmMemoryObject
  • WasmModuleObject
  • WasmStreaming
    The V8 interface for WebAssembly streaming compilation. When streaming compilation is initiated, V8 passes a Self object to the embedder such that the embedder can pass the input bytes for streaming compilation to V8.
  • Weak
    An object reference that does not prevent garbage collection for the object, and which allows installing finalization callbacks which will be called after the object has been GC’d.
  • WriteOptions

Enums§

  • ConstructorBehavior
    ConstructorBehavior::Allow creates a regular API function.
  • DataError
  • Encoding
  • FunctionCodeHandling
  • GarbageCollectionType
    Types of garbage collections that can be requested via Isolate::request_garbage_collection_for_testing.
  • IndexFilter
  • IntegrityLevel
    Object integrity levels can be used to restrict what can be done to an object’s properties.
  • Intercepted
    Interceptor callbacks use this value to indicate whether the request was intercepted or not.
  • Intrinsic
  • KeyCollectionMode
    Keys/Properties filter enums:
  • KeyConversionMode
  • MemoryPressureLevel
    Memory pressure level for the MemoryPressureNotification. None hints V8 that there is no memory pressure. Moderate hints V8 to speed up incremental garbage collection at the cost of higher latency due to garbage collection pauses. Critical hints V8 to free memory as soon as possible. Garbage collection pauses at this level will be large.
  • MicrotasksPolicy
    Policy for running microtasks:
  • ModuleStatus
    The different states a module can be in.
  • NewStringType
  • OnFailure
  • PromiseHookType
    PromiseHook with type Init is called when a new promise is created. When a new promise is created as part of the chain in the case of Promise.then or in the intermediate promises created by Promise.{race, all}/AsyncFunctionAwait, we pass the parent promise otherwise we pass undefined.
  • PromiseRejectEvent
  • PromiseState
  • SideEffectType
    Options for marking whether callbacks may trigger JS-observable side effects. Side-effect-free callbacks are allowlisted during debug evaluation with throwOnSideEffect. It applies when calling a Function, FunctionTemplate, or an Accessor callback. For Interceptors, please see PropertyHandlerFlags’s kHasNoSideEffect. Callbacks that only cause side effects to the receiver are allowlisted if invoked on receiver objects that are created within the same debug-evaluate call, as these objects are temporary and the side effect does not escape.
  • TimeZoneDetection
    Time zone redetection indicator for DateTimeConfigurationChangeNotification.
  • ValueViewData
  • WasmAsyncSuccess

Constants§

Traits§

  • Handle
  • HostImportModuleDynamicallyCallback
    HostImportModuleDynamicallyCallback is called when we require the embedder to load a module. This is used as part of the dynamic import syntax.
  • MapFnTo
  • ValueDeserializerHelper
    Trait used for direct read from the deserialization buffer. Mostly used by the read_host_object callback function in the ValueDeserializerImpl trait to create custom deserialization logic.
  • ValueDeserializerImpl
    The ValueDeserializerImpl trait allows for custom callback functions used by v8.
  • ValueSerializerHelper
    Trait used for direct write to the serialization buffer. Mostly used by the write_host_object callback function in the ValueSerializerImpl trait to create custom serialization logic.
  • ValueSerializerImpl
    The ValueSerializerImpl trait allows for custom callback functions used by v8.

Functions§

  • new_default_allocator
    malloc/free based convenience allocator.
  • new_default_platform
    Returns a new instance of the default v8::Platform implementation.
  • new_rust_allocator⚠
    Creates an allocator managed by Rust code.
  • new_single_threaded_default_platform
    The same as new_default_platform() but disables the worker thread pool. It must be used with the –single-threaded V8 flag.
  • new_unprotected_default_platform
    Creates a platform that is identical to the default platform, but does not enforce thread-isolated allocations. This may reduce security in some cases, so this method should be used with caution in cases where the threading guarantees of new_default_platform cannot be upheld (generally for tests).
  • null
  • undefined

Type Aliases§

Unions§