v8  9.4.146 (node 16.13.0)
V8 is Google's open source JavaScript engine
cppgc Namespace Reference

Namespaces

 internal
 
 subtle
 
 testing
 

Data Structures

class  MakeGarbageCollectedTraitBase
 
struct  AdditionalBytes
 
class  MakeGarbageCollectedTrait
 
struct  PostConstructionCallbackTrait
 
struct  CustomSpaceIndex
 
class  CustomSpaceBase
 
class  CustomSpace
 
struct  SpaceTrait
 
class  DefaultPlatform
 
struct  EphemeronPair
 
class  GarbageCollected
 
class  GarbageCollectedMixin
 
struct  HeapStatistics
 
class  Heap
 
class  LivenessBroker
 
class  NameProvider
 
class  Platform
 
class  ProcessHeapStatistics
 
class  SourceLocation
 
struct  TraceDescriptor
 
struct  TraceTrait
 
class  Visitor
 
struct  TraceTrait< v8::TracedReference< T > >
 

Typedefs

template<typename T >
using Member = internal::BasicMember< T, internal::StrongMemberTag, internal::DijkstraWriteBarrierPolicy >
 
template<typename T >
using WeakMember = internal::BasicMember< T, internal::WeakMemberTag, internal::DijkstraWriteBarrierPolicy >
 
template<typename T >
using UntracedMember = internal::BasicMember< T, internal::UntracedMemberTag, internal::NoWriteBarrierPolicy >
 
template<typename T >
using Persistent = internal::BasicPersistent< T, internal::StrongPersistentPolicy >
 
template<typename T >
using WeakPersistent = internal::BasicPersistent< T, internal::WeakPersistentPolicy >
 
using IdleTask = v8::IdleTask
 
using JobHandle = v8::JobHandle
 
using JobDelegate = v8::JobDelegate
 
using JobTask = v8::JobTask
 
using PageAllocator = v8::PageAllocator
 
using Task = v8::Task
 
using TaskPriority = v8::TaskPriority
 
using TaskRunner = v8::TaskRunner
 
using TracingController = v8::TracingController
 
using TraceCallback = void(*)(Visitor *visitor, const void *object)
 
using WeakCallback = void(*)(const LivenessBroker &, const void *)
 

Enumerations

enum class  EmbedderStackState { kMayContainHeapPointers , kNoHeapPointers }
 

Functions

template<typename T , typename... Args>
T * MakeGarbageCollected (AllocationHandle &handle, Args &&... args)
 
template<typename T , typename... Args>
T * MakeGarbageCollected (AllocationHandle &handle, AdditionalBytes additional_bytes, Args &&... args)
 
V8_EXPORT void InitializeProcess (PageAllocator *page_allocator)
 
V8_EXPORT void ShutdownProcess ()
 

Variables

constexpr internal::SentinelPointer kSentinelPointer
 
template<typename T >
constexpr bool IsGarbageCollectedMixinTypeV
 
template<typename T >
constexpr bool IsGarbageCollectedTypeV
 
template<typename T >
constexpr bool IsGarbageCollectedOrMixinTypeV
 
template<typename T >
constexpr bool IsGarbageCollectedWithMixinTypeV
 
template<typename T >
constexpr bool IsMemberTypeV = internal::IsMemberType<T>::value
 
template<typename T >
constexpr bool IsUntracedMemberTypeV = internal::IsUntracedMemberType<T>::value
 
template<typename T >
constexpr bool IsWeakMemberTypeV = internal::IsWeakMemberType<T>::value
 
template<typename T >
constexpr bool IsWeakV = internal::IsWeak<T>::value
 
template<typename T >
constexpr bool IsCompleteV = internal::IsComplete<T>::value
 

Detailed Description

cppgc - A C++ garbage collection library.

Typedef Documentation

◆ IdleTask

Definition at line 17 of file platform.h.

◆ JobDelegate

Definition at line 19 of file platform.h.

◆ JobHandle

Definition at line 18 of file platform.h.

◆ JobTask

Definition at line 20 of file platform.h.

◆ Member

using Member = internal::BasicMember<T, internal::StrongMemberTag, internal::DijkstraWriteBarrierPolicy>

Members are used in classes to contain strong pointers to other garbage collected objects. All Member fields of a class must be traced in the class' trace method.

Definition at line 261 of file member.h.

◆ PageAllocator

Definition at line 21 of file platform.h.

◆ Persistent

Persistent is a way to create a strong pointer from an off-heap object to another on-heap object. As long as the Persistent handle is alive the GC will keep the object pointed to alive. The Persistent handle is always a GC root from the point of view of the GC. Persistent must be constructed and destructed in the same thread.

Definition at line 356 of file persistent.h.

◆ Task

using Task = v8::Task

Definition at line 22 of file platform.h.

◆ TaskPriority

Definition at line 23 of file platform.h.

◆ TaskRunner

Definition at line 24 of file platform.h.

◆ TraceCallback

using TraceCallback = void (*)(Visitor* visitor, const void* object)

Callback for invoking tracing on a given object.

Parameters
visitorThe visitor to dispatch to.
objectThe object to invoke tracing on.

Definition at line 34 of file trace-trait.h.

◆ TracingController

Definition at line 25 of file platform.h.

◆ UntracedMember

using UntracedMember = internal::BasicMember<T, internal::UntracedMemberTag, internal::NoWriteBarrierPolicy>

UntracedMember is a pointer to an on-heap object that is not traced for some reason. Do not use this unless you know what you are doing. Keeping raw pointers to on-heap objects is prohibited unless used from stack. Pointee must be kept alive through other means.

Definition at line 283 of file member.h.

◆ WeakCallback

using WeakCallback = void (*)(const LivenessBroker&, const void*)

Definition at line 34 of file visitor.h.

◆ WeakMember

WeakMember is similar to Member in that it is used to point to other garbage collected objects. However instead of creating a strong pointer to the object, the WeakMember creates a weak pointer, which does not keep the pointee alive. Hence if all pointers to to a heap allocated object are weak the object will be garbage collected. At the time of GC the weak pointers will automatically be set to null.

Definition at line 273 of file member.h.

◆ WeakPersistent

WeakPersistent is a way to create a weak pointer from an off-heap object to an on-heap object. The pointer is automatically cleared when the pointee gets collected. WeakPersistent must be constructed and destructed in the same thread.

Definition at line 366 of file persistent.h.

Enumeration Type Documentation

◆ EmbedderStackState

enum EmbedderStackState
strong

Indicator for the stack state of the embedder.

Enumerator
kMayContainHeapPointers 

Stack may contain interesting heap pointers.

kNoHeapPointers 

Stack does not contain any interesting heap pointers.

Definition at line 16 of file common.h.

Function Documentation

◆ InitializeProcess()

V8_EXPORT void cppgc::InitializeProcess ( PageAllocator page_allocator)

Process-global initialization of the garbage collector. Must be called before creating a Heap.

Can be called multiple times when paired with ShutdownProcess().

Parameters
page_allocatorThe allocator used for maintaining meta data. Must not change between multiple calls to InitializeProcess.

◆ MakeGarbageCollected() [1/2]

T* cppgc::MakeGarbageCollected ( AllocationHandle &  handle,
AdditionalBytes  additional_bytes,
Args &&...  args 
)

Constructs a managed object of type T where T transitively inherits from GarbageCollected. Created objects will have additional bytes appended to it. Allocated memory would suffice for sizeof(T) + additional_bytes.

Parameters
additional_bytesDenotes how many bytes to append to T.
argsList of arguments with which an instance of T will be constructed.
Returns
an instance of type T.

Definition at line 223 of file allocation.h.

◆ MakeGarbageCollected() [2/2]

T* cppgc::MakeGarbageCollected ( AllocationHandle &  handle,
Args &&...  args 
)

Constructs a managed object of type T where T transitively inherits from GarbageCollected.

Parameters
argsList of arguments with which an instance of T will be constructed.
Returns
an instance of type T.

Definition at line 205 of file allocation.h.

◆ ShutdownProcess()

V8_EXPORT void cppgc::ShutdownProcess ( )

Must be called after destroying the last used heap. Some process-global metadata may not be returned and reused upon a subsequent InitializeProcess() call.

Variable Documentation

◆ IsCompleteV

constexpr bool IsCompleteV = internal::IsComplete<T>::value
constexpr

Value is true for types that are complete, and false otherwise.

Definition at line 243 of file type-traits.h.

◆ IsGarbageCollectedMixinTypeV

constexpr bool IsGarbageCollectedMixinTypeV
constexpr
Initial value:
=
internal::IsGarbageCollectedMixinType<T>::value

Value is true for types that inherit from GarbageCollectedMixin but not GarbageCollected<T> (i.e., they are free mixins), and false otherwise.

Definition at line 187 of file type-traits.h.

◆ IsGarbageCollectedOrMixinTypeV

constexpr bool IsGarbageCollectedOrMixinTypeV
constexpr
Initial value:
=
internal::IsGarbageCollectedOrMixinType<T>::value

Value is true for types that inherit from either GarbageCollected<T> or GarbageCollectedMixin, and false otherwise.

Definition at line 203 of file type-traits.h.

◆ IsGarbageCollectedTypeV

constexpr bool IsGarbageCollectedTypeV
constexpr
Initial value:
=
internal::IsGarbageCollectedType<T>::value

Value is true for types that inherit from GarbageCollected<T>, and false otherwise.

Definition at line 195 of file type-traits.h.

◆ IsGarbageCollectedWithMixinTypeV

constexpr bool IsGarbageCollectedWithMixinTypeV
constexpr
Initial value:
=
internal::IsGarbageCollectedWithMixinType<T>::value

Value is true for types that inherit from GarbageCollected<T> and GarbageCollectedMixin, and false otherwise.

Definition at line 211 of file type-traits.h.

◆ IsMemberTypeV

constexpr bool IsMemberTypeV = internal::IsMemberType<T>::value
constexpr

Value is true for types of type Member<T>, and false otherwise.

Definition at line 218 of file type-traits.h.

◆ IsUntracedMemberTypeV

constexpr bool IsUntracedMemberTypeV = internal::IsUntracedMemberType<T>::value
constexpr

Value is true for types of type UntracedMember<T>, and false otherwise.

Definition at line 224 of file type-traits.h.

◆ IsWeakMemberTypeV

constexpr bool IsWeakMemberTypeV = internal::IsWeakMemberType<T>::value
constexpr

Value is true for types of type WeakMember<T>, and false otherwise.

Definition at line 230 of file type-traits.h.

◆ IsWeakV

constexpr bool IsWeakV = internal::IsWeak<T>::value
constexpr

Value is true for types that are considered weak references, and false otherwise.

Definition at line 237 of file type-traits.h.

◆ kSentinelPointer