从master分支拉取puerts，并拉取v8制品，修改puerts插件部分UE5_5以下兼容的宏代码。保证puerts编译通过。包括

CSharpParamDefaultValueMetas.cs和ubtplugin.csproj和declarationGenerator.cpp和PropertyTranslator.cpp对UserDefinedStruct.h的引用

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/api-constants.h

@@ -0,0 +1,47 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_API_CONSTANTS_H_
+#define INCLUDE_CPPGC_INTERNAL_API_CONSTANTS_H_
+
+#include <cstddef>
+#include <cstdint>
+
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+
+// Embedders should not rely on this code!
+
+// Internal constants to avoid exposing internal types on the API surface.
+namespace api_constants {
+
+constexpr size_t kKB = 1024;
+constexpr size_t kMB = kKB * 1024;
+constexpr size_t kGB = kMB * 1024;
+
+// Offset of the uint16_t bitfield from the payload contaning the
+// in-construction bit. This is subtracted from the payload pointer to get
+// to the right bitfield.
+static constexpr size_t kFullyConstructedBitFieldOffsetFromPayload =
+    2 * sizeof(uint16_t);
+// Mask for in-construction bit.
+static constexpr uint16_t kFullyConstructedBitMask = uint16_t{1};
+
+static constexpr size_t kPageSize = size_t{1} << 17;
+
+static constexpr size_t kLargeObjectSizeThreshold = kPageSize / 2;
+
+#if defined(CPPGC_CAGED_HEAP)
+constexpr size_t kCagedHeapReservationSize = static_cast<size_t>(4) * kGB;
+constexpr size_t kCagedHeapReservationAlignment = kCagedHeapReservationSize;
+#endif
+
+}  // namespace api_constants
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_API_CONSTANTS_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/atomic-entry-flag.h

@@ -0,0 +1,48 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_ATOMIC_ENTRY_FLAG_H_
+#define INCLUDE_CPPGC_INTERNAL_ATOMIC_ENTRY_FLAG_H_
+
+#include <atomic>
+
+namespace cppgc {
+namespace internal {
+
+// A flag which provides a fast check whether a scope may be entered on the
+// current thread, without needing to access thread-local storage or mutex.  Can
+// have false positives (i.e., spuriously report that it might be entered), so
+// it is expected that this will be used in tandem with a precise check that the
+// scope is in fact entered on that thread.
+//
+// Example:
+//   g_frobnicating_flag.MightBeEntered() &&
+//   ThreadLocalFrobnicator().IsFrobnicating()
+//
+// Relaxed atomic operations are sufficient, since:
+// - all accesses remain atomic
+// - each thread must observe its own operations in order
+// - no thread ever exits the flag more times than it enters (if used correctly)
+// And so if a thread observes zero, it must be because it has observed an equal
+// number of exits as entries.
+class AtomicEntryFlag final {
+ public:
+  void Enter() { entries_.fetch_add(1, std::memory_order_relaxed); }
+  void Exit() { entries_.fetch_sub(1, std::memory_order_relaxed); }
+
+  // Returns false only if the current thread is not between a call to Enter
+  // and a call to Exit. Returns true if this thread or another thread may
+  // currently be in the scope guarded by this flag.
+  bool MightBeEntered() const {
+    return entries_.load(std::memory_order_relaxed) != 0;
+  }
+
+ private:
+  std::atomic_int entries_{0};
+};
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_ATOMIC_ENTRY_FLAG_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/caged-heap-local-data.h

@@ -0,0 +1,68 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_
+#define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_
+
+#include <array>
+
+#include "cppgc/internal/api-constants.h"
+#include "cppgc/internal/logging.h"
+#include "cppgc/platform.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+
+class HeapBase;
+
+#if defined(CPPGC_YOUNG_GENERATION)
+
+// AgeTable contains entries that correspond to 4KB memory regions. Each entry
+// can be in one of three states: kOld, kYoung or kUnknown.
+class AgeTable final {
+  static constexpr size_t kGranularityBits = 12;  // 4KiB per byte.
+
+ public:
+  enum class Age : uint8_t { kOld, kYoung, kUnknown };
+
+  static constexpr size_t kEntrySizeInBytes = 1 << kGranularityBits;
+
+  Age& operator[](uintptr_t offset) { return table_[entry(offset)]; }
+  Age operator[](uintptr_t offset) const { return table_[entry(offset)]; }
+
+  void Reset(PageAllocator* allocator);
+
+ private:
+  static constexpr size_t kAgeTableSize =
+      api_constants::kCagedHeapReservationSize >> kGranularityBits;
+
+  size_t entry(uintptr_t offset) const {
+    const size_t entry = offset >> kGranularityBits;
+    CPPGC_DCHECK(table_.size() > entry);
+    return entry;
+  }
+
+  std::array<Age, kAgeTableSize> table_;
+};
+
+static_assert(sizeof(AgeTable) == 1 * api_constants::kMB,
+              "Size of AgeTable is 1MB");
+
+#endif  // CPPGC_YOUNG_GENERATION
+
+struct CagedHeapLocalData final {
+  explicit CagedHeapLocalData(HeapBase* heap_base) : heap_base(heap_base) {}
+
+  bool is_incremental_marking_in_progress = false;
+  HeapBase* heap_base = nullptr;
+#if defined(CPPGC_YOUNG_GENERATION)
+  AgeTable age_table;
+#endif
+};
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/compiler-specific.h

@@ -0,0 +1,38 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_COMPILER_SPECIFIC_H_
+#define INCLUDE_CPPGC_INTERNAL_COMPILER_SPECIFIC_H_
+
+namespace cppgc {
+
+#if defined(__has_attribute)
+#define CPPGC_HAS_ATTRIBUTE(FEATURE) __has_attribute(FEATURE)
+#else
+#define CPPGC_HAS_ATTRIBUTE(FEATURE) 0
+#endif
+
+#if defined(__has_cpp_attribute)
+#define CPPGC_HAS_CPP_ATTRIBUTE(FEATURE) __has_cpp_attribute(FEATURE)
+#else
+#define CPPGC_HAS_CPP_ATTRIBUTE(FEATURE) 0
+#endif
+
+// [[no_unique_address]] comes in C++20 but supported in clang with -std >=
+// c++11.
+#if CPPGC_HAS_CPP_ATTRIBUTE(no_unique_address)
+#define CPPGC_NO_UNIQUE_ADDRESS [[no_unique_address]]
+#else
+#define CPPGC_NO_UNIQUE_ADDRESS
+#endif
+
+#if CPPGC_HAS_ATTRIBUTE(unused)
+#define CPPGC_UNUSED __attribute__((unused))
+#else
+#define CPPGC_UNUSED
+#endif
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_COMPILER_SPECIFIC_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/finalizer-trait.h

@@ -0,0 +1,90 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_FINALIZER_TRAIT_H_
+#define INCLUDE_CPPGC_INTERNAL_FINALIZER_TRAIT_H_
+
+#include <type_traits>
+
+#include "cppgc/type-traits.h"
+
+namespace cppgc {
+namespace internal {
+
+using FinalizationCallback = void (*)(void*);
+
+template <typename T, typename = void>
+struct HasFinalizeGarbageCollectedObject : std::false_type {};
+
+template <typename T>
+struct HasFinalizeGarbageCollectedObject<
+    T, void_t<decltype(std::declval<T>().FinalizeGarbageCollectedObject())>>
+    : std::true_type {};
+
+// The FinalizerTraitImpl specifies how to finalize objects.
+template <typename T, bool isFinalized>
+struct FinalizerTraitImpl;
+
+template <typename T>
+struct FinalizerTraitImpl<T, true> {
+ private:
+  // Dispatch to custom FinalizeGarbageCollectedObject().
+  struct Custom {
+    static void Call(void* obj) {
+      static_cast<T*>(obj)->FinalizeGarbageCollectedObject();
+    }
+  };
+
+  // Dispatch to regular destructor.
+  struct Destructor {
+    static void Call(void* obj) { static_cast<T*>(obj)->~T(); }
+  };
+
+  using FinalizeImpl =
+      std::conditional_t<HasFinalizeGarbageCollectedObject<T>::value, Custom,
+                         Destructor>;
+
+ public:
+  static void Finalize(void* obj) {
+    static_assert(sizeof(T), "T must be fully defined");
+    FinalizeImpl::Call(obj);
+  }
+};
+
+template <typename T>
+struct FinalizerTraitImpl<T, false> {
+  static void Finalize(void* obj) {
+    static_assert(sizeof(T), "T must be fully defined");
+  }
+};
+
+// The FinalizerTrait is used to determine if a type requires finalization and
+// what finalization means.
+template <typename T>
+struct FinalizerTrait {
+ private:
+  // Object has a finalizer if it has
+  // - a custom FinalizeGarbageCollectedObject method, or
+  // - a destructor.
+  static constexpr bool kNonTrivialFinalizer =
+      internal::HasFinalizeGarbageCollectedObject<T>::value ||
+      !std::is_trivially_destructible<typename std::remove_cv<T>::type>::value;
+
+  static void Finalize(void* obj) {
+    internal::FinalizerTraitImpl<T, kNonTrivialFinalizer>::Finalize(obj);
+  }
+
+ public:
+  // The callback used to finalize an object of type T.
+  static constexpr FinalizationCallback kCallback =
+      kNonTrivialFinalizer ? Finalize : nullptr;
+};
+
+template <typename T>
+constexpr FinalizationCallback FinalizerTrait<T>::kCallback;
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_FINALIZER_TRAIT_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/gc-info.h

@@ -0,0 +1,76 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_GC_INFO_H_
+#define INCLUDE_CPPGC_INTERNAL_GC_INFO_H_
+
+#include <atomic>
+#include <cstdint>
+#include <type_traits>
+
+#include "cppgc/internal/finalizer-trait.h"
+#include "cppgc/internal/name-trait.h"
+#include "cppgc/trace-trait.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+
+using GCInfoIndex = uint16_t;
+
+// Acquires a new GC info object and returns the index. In addition, also
+// updates `registered_index` atomically.
+V8_EXPORT GCInfoIndex
+EnsureGCInfoIndex(std::atomic<GCInfoIndex>& registered_index,
+                  FinalizationCallback, TraceCallback, NameCallback, bool);
+
+// Fold types based on finalizer behavior. Note that finalizer characteristics
+// align with trace behavior, i.e., destructors are virtual when trace methods
+// are and vice versa.
+template <typename T, typename ParentMostGarbageCollectedType>
+struct GCInfoFolding {
+  static constexpr bool kHasVirtualDestructorAtBase =
+      std::has_virtual_destructor<ParentMostGarbageCollectedType>::value;
+  static constexpr bool kBothTypesAreTriviallyDestructible =
+      std::is_trivially_destructible<ParentMostGarbageCollectedType>::value &&
+      std::is_trivially_destructible<T>::value;
+  static constexpr bool kHasCustomFinalizerDispatchAtBase =
+      internal::HasFinalizeGarbageCollectedObject<
+          ParentMostGarbageCollectedType>::value;
+#ifdef CPPGC_SUPPORTS_OBJECT_NAMES
+  static constexpr bool kWantsDetailedObjectNames = true;
+#else   // !CPPGC_SUPPORTS_OBJECT_NAMES
+  static constexpr bool kWantsDetailedObjectNames = false;
+#endif  // !CPPGC_SUPPORTS_OBJECT_NAMES
+
+  // Folding would regresses name resolution when deriving names from C++
+  // class names as it would just folds a name to the base class name.
+  using ResultType = std::conditional_t<(kHasVirtualDestructorAtBase ||
+                                         kBothTypesAreTriviallyDestructible ||
+                                         kHasCustomFinalizerDispatchAtBase) &&
+                                            !kWantsDetailedObjectNames,
+                                        ParentMostGarbageCollectedType, T>;
+};
+
+// Trait determines how the garbage collector treats objects wrt. to traversing,
+// finalization, and naming.
+template <typename T>
+struct GCInfoTrait final {
+  static GCInfoIndex Index() {
+    static_assert(sizeof(T), "T must be fully defined");
+    static std::atomic<GCInfoIndex>
+        registered_index;  // Uses zero initialization.
+    const GCInfoIndex index = registered_index.load(std::memory_order_acquire);
+    return index ? index
+                 : EnsureGCInfoIndex(
+                       registered_index, FinalizerTrait<T>::kCallback,
+                       TraceTrait<T>::Trace, NameTrait<T>::GetName,
+                       std::is_polymorphic<T>::value);
+  }
+};
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_GC_INFO_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/logging.h

@@ -0,0 +1,50 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_LOGGING_H_
+#define INCLUDE_CPPGC_INTERNAL_LOGGING_H_
+
+#include "cppgc/source-location.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+
+void V8_EXPORT DCheckImpl(const char*,
+                          const SourceLocation& = SourceLocation::Current());
+[[noreturn]] void V8_EXPORT
+FatalImpl(const char*, const SourceLocation& = SourceLocation::Current());
+
+// Used to ignore -Wunused-variable.
+template <typename>
+struct EatParams {};
+
+#if DEBUG
+#define CPPGC_DCHECK_MSG(condition, message)  \
+  do {                                        \
+    if (V8_UNLIKELY(!(condition))) {          \
+      ::cppgc::internal::DCheckImpl(message); \
+    }                                         \
+  } while (false)
+#else
+#define CPPGC_DCHECK_MSG(condition, message)                \
+  (static_cast<void>(::cppgc::internal::EatParams<decltype( \
+                         static_cast<void>(condition), message)>{}))
+#endif
+
+#define CPPGC_DCHECK(condition) CPPGC_DCHECK_MSG(condition, #condition)
+
+#define CPPGC_CHECK_MSG(condition, message)  \
+  do {                                       \
+    if (V8_UNLIKELY(!(condition))) {         \
+      ::cppgc::internal::FatalImpl(message); \
+    }                                        \
+  } while (false)
+
+#define CPPGC_CHECK(condition) CPPGC_CHECK_MSG(condition, #condition)
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_LOGGING_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/name-trait.h

@@ -0,0 +1,111 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_NAME_TRAIT_H_
+#define INCLUDE_CPPGC_INTERNAL_NAME_TRAIT_H_
+
+#include <cstddef>
+
+#include "cppgc/name-provider.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+
+#if CPPGC_SUPPORTS_OBJECT_NAMES && defined(__clang__)
+#define CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME 1
+
+// Provides constexpr c-string storage for a name of fixed |Size| characters.
+// Automatically appends terminating 0 byte.
+template <size_t Size>
+struct NameBuffer {
+  char name[Size + 1]{};
+
+  static constexpr NameBuffer FromCString(const char* str) {
+    NameBuffer result;
+    for (size_t i = 0; i < Size; ++i) result.name[i] = str[i];
+    result.name[Size] = 0;
+    return result;
+  }
+};
+
+template <typename T>
+const char* GetTypename() {
+  static constexpr char kSelfPrefix[] =
+      "const char *cppgc::internal::GetTypename() [T =";
+  static_assert(__builtin_strncmp(__PRETTY_FUNCTION__, kSelfPrefix,
+                                  sizeof(kSelfPrefix) - 1) == 0,
+                "The prefix must match");
+  static constexpr const char* kTypenameStart =
+      __PRETTY_FUNCTION__ + sizeof(kSelfPrefix);
+  static constexpr size_t kTypenameSize =
+      __builtin_strlen(__PRETTY_FUNCTION__) - sizeof(kSelfPrefix) - 1;
+  // NameBuffer is an indirection that is needed to make sure that only a
+  // substring of __PRETTY_FUNCTION__ gets materialized in the binary.
+  static constexpr auto buffer =
+      NameBuffer<kTypenameSize>::FromCString(kTypenameStart);
+  return buffer.name;
+}
+
+#else
+#define CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME 0
+#endif
+
+struct HeapObjectName {
+  const char* value;
+  bool name_was_hidden;
+};
+
+class V8_EXPORT NameTraitBase {
+ protected:
+  static HeapObjectName GetNameFromTypeSignature(const char*);
+};
+
+// Trait that specifies how the garbage collector retrieves the name for a
+// given object.
+template <typename T>
+class NameTrait final : public NameTraitBase {
+ public:
+  static HeapObjectName GetName(const void* obj) {
+    return GetNameFor(static_cast<const T*>(obj));
+  }
+
+ private:
+  static HeapObjectName GetNameFor(const NameProvider* name_provider) {
+    return {name_provider->GetHumanReadableName(), false};
+  }
+
+  static HeapObjectName GetNameFor(...) {
+#if CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME
+    return {GetTypename<T>(), false};
+#elif CPPGC_SUPPORTS_OBJECT_NAMES
+
+#if defined(V8_CC_GNU)
+#define PRETTY_FUNCTION_VALUE __PRETTY_FUNCTION__
+#elif defined(V8_CC_MSVC)
+#define PRETTY_FUNCTION_VALUE __FUNCSIG__
+#else
+#define PRETTY_FUNCTION_VALUE nullptr
+#endif
+
+    static const HeapObjectName leaky_name =
+        GetNameFromTypeSignature(PRETTY_FUNCTION_VALUE);
+    return {leaky_name, false};
+
+#undef PRETTY_FUNCTION_VALUE
+
+#else   // !CPPGC_SUPPORTS_OBJECT_NAMES
+    return {NameProvider::kHiddenName, true};
+#endif  // !CPPGC_SUPPORTS_OBJECT_NAMES
+  }
+};
+
+using NameCallback = HeapObjectName (*)(const void*);
+
+}  // namespace internal
+}  // namespace cppgc
+
+#undef CPPGC_SUPPORTS_COMPILE_TIME_TYPENAME
+
+#endif  // INCLUDE_CPPGC_INTERNAL_NAME_TRAIT_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/persistent-node.h

@@ -0,0 +1,172 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_
+#define INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_
+
+#include <array>
+#include <memory>
+#include <vector>
+
+#include "cppgc/internal/logging.h"
+#include "cppgc/trace-trait.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+
+class Visitor;
+
+namespace internal {
+
+class CrossThreadPersistentRegion;
+
+// PersistentNode represents a variant of two states:
+// 1) traceable node with a back pointer to the Persistent object;
+// 2) freelist entry.
+class PersistentNode final {
+ public:
+  PersistentNode() = default;
+
+  PersistentNode(const PersistentNode&) = delete;
+  PersistentNode& operator=(const PersistentNode&) = delete;
+
+  void InitializeAsUsedNode(void* owner, TraceCallback trace) {
+    CPPGC_DCHECK(trace);
+    owner_ = owner;
+    trace_ = trace;
+  }
+
+  void InitializeAsFreeNode(PersistentNode* next) {
+    next_ = next;
+    trace_ = nullptr;
+  }
+
+  void UpdateOwner(void* owner) {
+    CPPGC_DCHECK(IsUsed());
+    owner_ = owner;
+  }
+
+  PersistentNode* FreeListNext() const {
+    CPPGC_DCHECK(!IsUsed());
+    return next_;
+  }
+
+  void Trace(Visitor* visitor) const {
+    CPPGC_DCHECK(IsUsed());
+    trace_(visitor, owner_);
+  }
+
+  bool IsUsed() const { return trace_; }
+
+  void* owner() const {
+    CPPGC_DCHECK(IsUsed());
+    return owner_;
+  }
+
+ private:
+  // PersistentNode acts as a designated union:
+  // If trace_ != nullptr, owner_ points to the corresponding Persistent handle.
+  // Otherwise, next_ points to the next freed PersistentNode.
+  union {
+    void* owner_ = nullptr;
+    PersistentNode* next_;
+  };
+  TraceCallback trace_ = nullptr;
+};
+
+class V8_EXPORT PersistentRegion {
+  using PersistentNodeSlots = std::array<PersistentNode, 256u>;
+
+ public:
+  PersistentRegion() = default;
+  // Clears Persistent fields to avoid stale pointers after heap teardown.
+  ~PersistentRegion();
+
+  PersistentRegion(const PersistentRegion&) = delete;
+  PersistentRegion& operator=(const PersistentRegion&) = delete;
+
+  PersistentNode* AllocateNode(void* owner, TraceCallback trace) {
+    if (!free_list_head_) {
+      EnsureNodeSlots();
+    }
+    PersistentNode* node = free_list_head_;
+    free_list_head_ = free_list_head_->FreeListNext();
+    CPPGC_DCHECK(!node->IsUsed());
+    node->InitializeAsUsedNode(owner, trace);
+    nodes_in_use_++;
+    return node;
+  }
+
+  void FreeNode(PersistentNode* node) {
+    CPPGC_DCHECK(node);
+    CPPGC_DCHECK(node->IsUsed());
+    node->InitializeAsFreeNode(free_list_head_);
+    free_list_head_ = node;
+    CPPGC_DCHECK(nodes_in_use_ > 0);
+    nodes_in_use_--;
+  }
+
+  void Trace(Visitor*);
+
+  size_t NodesInUse() const;
+
+  void ClearAllUsedNodes();
+
+ private:
+  void EnsureNodeSlots();
+
+  template <typename PersistentBaseClass>
+  void ClearAllUsedNodes();
+
+  std::vector<std::unique_ptr<PersistentNodeSlots>> nodes_;
+  PersistentNode* free_list_head_ = nullptr;
+  size_t nodes_in_use_ = 0;
+
+  friend class CrossThreadPersistentRegion;
+};
+
+// CrossThreadPersistent uses PersistentRegion but protects it using this lock
+// when needed.
+class V8_EXPORT PersistentRegionLock final {
+ public:
+  PersistentRegionLock();
+  ~PersistentRegionLock();
+
+  static void AssertLocked();
+};
+
+// Variant of PersistentRegion that checks whether the PersistentRegionLock is
+// locked.
+class V8_EXPORT CrossThreadPersistentRegion final : protected PersistentRegion {
+ public:
+  CrossThreadPersistentRegion() = default;
+  // Clears Persistent fields to avoid stale pointers after heap teardown.
+  ~CrossThreadPersistentRegion();
+
+  CrossThreadPersistentRegion(const CrossThreadPersistentRegion&) = delete;
+  CrossThreadPersistentRegion& operator=(const CrossThreadPersistentRegion&) =
+      delete;
+
+  V8_INLINE PersistentNode* AllocateNode(void* owner, TraceCallback trace) {
+    PersistentRegionLock::AssertLocked();
+    return PersistentRegion::AllocateNode(owner, trace);
+  }
+
+  V8_INLINE void FreeNode(PersistentNode* node) {
+    PersistentRegionLock::AssertLocked();
+    PersistentRegion::FreeNode(node);
+  }
+
+  void Trace(Visitor*);
+
+  size_t NodesInUse() const;
+
+  void ClearAllUsedNodes();
+};
+
+}  // namespace internal
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/pointer-policies.h

@@ -0,0 +1,175 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_POINTER_POLICIES_H_
+#define INCLUDE_CPPGC_INTERNAL_POINTER_POLICIES_H_
+
+#include <cstdint>
+#include <type_traits>
+
+#include "cppgc/internal/write-barrier.h"
+#include "cppgc/sentinel-pointer.h"
+#include "cppgc/source-location.h"
+#include "cppgc/type-traits.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace cppgc {
+namespace internal {
+
+class HeapBase;
+class PersistentRegion;
+class CrossThreadPersistentRegion;
+
+// Tags to distinguish between strong and weak member types.
+class StrongMemberTag;
+class WeakMemberTag;
+class UntracedMemberTag;
+
+struct DijkstraWriteBarrierPolicy {
+  static void InitializingBarrier(const void*, const void*) {
+    // Since in initializing writes the source object is always white, having no
+    // barrier doesn't break the tri-color invariant.
+  }
+  static void AssigningBarrier(const void* slot, const void* value) {
+    WriteBarrier::Params params;
+    switch (WriteBarrier::GetWriteBarrierType(slot, value, params)) {
+      case WriteBarrier::Type::kGenerational:
+        WriteBarrier::GenerationalBarrier(params, slot);
+        break;
+      case WriteBarrier::Type::kMarking:
+        WriteBarrier::DijkstraMarkingBarrier(params, value);
+        break;
+      case WriteBarrier::Type::kNone:
+        break;
+    }
+  }
+};
+
+struct NoWriteBarrierPolicy {
+  static void InitializingBarrier(const void*, const void*) {}
+  static void AssigningBarrier(const void*, const void*) {}
+};
+
+class V8_EXPORT EnabledCheckingPolicy {
+ protected:
+  template <typename T>
+  void CheckPointer(const T* ptr) {
+    if (!ptr || (kSentinelPointer == ptr)) return;
+
+    CheckPointersImplTrampoline<T>::Call(this, ptr);
+  }
+
+ private:
+  void CheckPointerImpl(const void* ptr, bool points_to_payload);
+
+  template <typename T, bool = IsCompleteV<T>>
+  struct CheckPointersImplTrampoline {
+    static void Call(EnabledCheckingPolicy* policy, const T* ptr) {
+      policy->CheckPointerImpl(ptr, false);
+    }
+  };
+
+  template <typename T>
+  struct CheckPointersImplTrampoline<T, true> {
+    static void Call(EnabledCheckingPolicy* policy, const T* ptr) {
+      policy->CheckPointerImpl(ptr, IsGarbageCollectedTypeV<T>);
+    }
+  };
+
+  const HeapBase* heap_ = nullptr;
+};
+
+class DisabledCheckingPolicy {
+ protected:
+  void CheckPointer(const void*) {}
+};
+
+#if V8_ENABLE_CHECKS
+using DefaultMemberCheckingPolicy = EnabledCheckingPolicy;
+using DefaultPersistentCheckingPolicy = EnabledCheckingPolicy;
+#else
+using DefaultMemberCheckingPolicy = DisabledCheckingPolicy;
+using DefaultPersistentCheckingPolicy = DisabledCheckingPolicy;
+#endif
+// For CT(W)P neither marking information (for value), nor objectstart bitmap
+// (for slot) are guaranteed to be present because there's no synchonization
+// between heaps after marking.
+using DefaultCrossThreadPersistentCheckingPolicy = DisabledCheckingPolicy;
+
+class KeepLocationPolicy {
+ public:
+  constexpr const SourceLocation& Location() const { return location_; }
+
+ protected:
+  constexpr KeepLocationPolicy() = default;
+  constexpr explicit KeepLocationPolicy(const SourceLocation& location)
+      : location_(location) {}
+
+  // KeepLocationPolicy must not copy underlying source locations.
+  KeepLocationPolicy(const KeepLocationPolicy&) = delete;
+  KeepLocationPolicy& operator=(const KeepLocationPolicy&) = delete;
+
+  // Location of the original moved from object should be preserved.
+  KeepLocationPolicy(KeepLocationPolicy&&) = default;
+  KeepLocationPolicy& operator=(KeepLocationPolicy&&) = default;
+
+ private:
+  SourceLocation location_;
+};
+
+class IgnoreLocationPolicy {
+ public:
+  constexpr SourceLocation Location() const { return {}; }
+
+ protected:
+  constexpr IgnoreLocationPolicy() = default;
+  constexpr explicit IgnoreLocationPolicy(const SourceLocation&) {}
+};
+
+#if CPPGC_SUPPORTS_OBJECT_NAMES
+using DefaultLocationPolicy = KeepLocationPolicy;
+#else
+using DefaultLocationPolicy = IgnoreLocationPolicy;
+#endif
+
+struct StrongPersistentPolicy {
+  using IsStrongPersistent = std::true_type;
+  static V8_EXPORT PersistentRegion& GetPersistentRegion(const void* object);
+};
+
+struct WeakPersistentPolicy {
+  using IsStrongPersistent = std::false_type;
+  static V8_EXPORT PersistentRegion& GetPersistentRegion(const void* object);
+};
+
+struct StrongCrossThreadPersistentPolicy {
+  using IsStrongPersistent = std::true_type;
+  static V8_EXPORT CrossThreadPersistentRegion& GetPersistentRegion(
+      const void* object);
+};
+
+struct WeakCrossThreadPersistentPolicy {
+  using IsStrongPersistent = std::false_type;
+  static V8_EXPORT CrossThreadPersistentRegion& GetPersistentRegion(
+      const void* object);
+};
+
+// Forward declarations setting up the default policies.
+template <typename T, typename WeaknessPolicy,
+          typename LocationPolicy = DefaultLocationPolicy,
+          typename CheckingPolicy = DefaultCrossThreadPersistentCheckingPolicy>
+class BasicCrossThreadPersistent;
+template <typename T, typename WeaknessPolicy,
+          typename LocationPolicy = DefaultLocationPolicy,
+          typename CheckingPolicy = DefaultPersistentCheckingPolicy>
+class BasicPersistent;
+template <typename T, typename WeaknessTag, typename WriteBarrierPolicy,
+          typename CheckingPolicy = DefaultMemberCheckingPolicy>
+class BasicMember;
+
+}  // namespace internal
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_POINTER_POLICIES_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/prefinalizer-handler.h

@@ -0,0 +1,30 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_PREFINALIZER_HANDLER_H_
+#define INCLUDE_CPPGC_INTERNAL_PREFINALIZER_HANDLER_H_
+
+#include "cppgc/heap.h"
+#include "cppgc/liveness-broker.h"
+
+namespace cppgc {
+namespace internal {
+
+class V8_EXPORT PreFinalizerRegistrationDispatcher final {
+ public:
+  using PreFinalizerCallback = bool (*)(const LivenessBroker&, void*);
+  struct PreFinalizer {
+    void* object;
+    PreFinalizerCallback callback;
+
+    bool operator==(const PreFinalizer& other) const;
+  };
+
+  static void RegisterPrefinalizer(PreFinalizer pre_finalizer);
+};
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_PREFINALIZER_HANDLER_H_

Plugins/Puerts/ThirdParty/v8_9.4.146.24/Inc/cppgc/internal/write-barrier.h

@@ -0,0 +1,433 @@
+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_INTERNAL_WRITE_BARRIER_H_
+#define INCLUDE_CPPGC_INTERNAL_WRITE_BARRIER_H_
+
+#include <cstddef>
+#include <cstdint>
+
+#include "cppgc/heap-state.h"
+#include "cppgc/internal/api-constants.h"
+#include "cppgc/internal/atomic-entry-flag.h"
+#include "cppgc/platform.h"
+#include "cppgc/sentinel-pointer.h"
+#include "cppgc/trace-trait.h"
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+#if defined(CPPGC_CAGED_HEAP)
+#include "cppgc/internal/caged-heap-local-data.h"
+#endif
+
+namespace cppgc {
+
+class HeapHandle;
+
+namespace internal {
+
+#if defined(CPPGC_CAGED_HEAP)
+class WriteBarrierTypeForCagedHeapPolicy;
+#else   // !CPPGC_CAGED_HEAP
+class WriteBarrierTypeForNonCagedHeapPolicy;
+#endif  // !CPPGC_CAGED_HEAP
+
+class V8_EXPORT WriteBarrier final {
+ public:
+  enum class Type : uint8_t {
+    kNone,
+    kMarking,
+    kGenerational,
+  };
+
+  struct Params {
+    HeapHandle* heap = nullptr;
+#if V8_ENABLE_CHECKS
+    Type type = Type::kNone;
+#endif  // !V8_ENABLE_CHECKS
+#if defined(CPPGC_CAGED_HEAP)
+    uintptr_t start = 0;
+    CagedHeapLocalData& caged_heap() const {
+      return *reinterpret_cast<CagedHeapLocalData*>(start);
+    }
+    uintptr_t slot_offset = 0;
+    uintptr_t value_offset = 0;
+#endif  // CPPGC_CAGED_HEAP
+  };
+
+  enum class ValueMode {
+    kValuePresent,
+    kNoValuePresent,
+  };
+
+  // Returns the required write barrier for a given `slot` and `value`.
+  static V8_INLINE Type GetWriteBarrierType(const void* slot, const void* value,
+                                            Params& params);
+  // Returns the required write barrier for a given `slot`.
+  template <typename HeapHandleCallback>
+  static V8_INLINE Type GetWriteBarrierType(const void* slot, Params& params,
+                                            HeapHandleCallback callback);
+  // Returns the required write barrier for a given  `value`.
+  static V8_INLINE Type GetWriteBarrierType(const void* value, Params& params);
+
+  template <typename HeapHandleCallback>
+  static V8_INLINE Type GetWriteBarrierTypeForExternallyReferencedObject(
+      const void* value, Params& params, HeapHandleCallback callback);
+
+  static V8_INLINE void DijkstraMarkingBarrier(const Params& params,
+                                               const void* object);
+  static V8_INLINE void DijkstraMarkingBarrierRange(
+      const Params& params, const void* first_element, size_t element_size,
+      size_t number_of_elements, TraceCallback trace_callback);
+  static V8_INLINE void SteeleMarkingBarrier(const Params& params,
+                                             const void* object);
+#if defined(CPPGC_YOUNG_GENERATION)
+  static V8_INLINE void GenerationalBarrier(const Params& params,
+                                            const void* slot);
+#else   // !CPPGC_YOUNG_GENERATION
+  static V8_INLINE void GenerationalBarrier(const Params& params,
+                                            const void* slot) {}
+#endif  // CPPGC_YOUNG_GENERATION
+
+#if V8_ENABLE_CHECKS
+  static void CheckParams(Type expected_type, const Params& params);
+#else   // !V8_ENABLE_CHECKS
+  static void CheckParams(Type expected_type, const Params& params) {}
+#endif  // !V8_ENABLE_CHECKS
+
+  // The IncrementalOrConcurrentUpdater class allows cppgc internal to update
+  // |incremental_or_concurrent_marking_flag_|.
+  class IncrementalOrConcurrentMarkingFlagUpdater;
+  static bool IsAnyIncrementalOrConcurrentMarking() {
+    return incremental_or_concurrent_marking_flag_.MightBeEntered();
+  }
+
+ private:
+  WriteBarrier() = delete;
+
+#if defined(CPPGC_CAGED_HEAP)
+  using WriteBarrierTypePolicy = WriteBarrierTypeForCagedHeapPolicy;
+#else   // !CPPGC_CAGED_HEAP
+  using WriteBarrierTypePolicy = WriteBarrierTypeForNonCagedHeapPolicy;
+#endif  // !CPPGC_CAGED_HEAP
+
+  static void DijkstraMarkingBarrierSlow(const void* value);
+  static void DijkstraMarkingBarrierSlowWithSentinelCheck(const void* value);
+  static void DijkstraMarkingBarrierRangeSlow(HeapHandle& heap_handle,
+                                              const void* first_element,
+                                              size_t element_size,
+                                              size_t number_of_elements,
+                                              TraceCallback trace_callback);
+  static void SteeleMarkingBarrierSlow(const void* value);
+  static void SteeleMarkingBarrierSlowWithSentinelCheck(const void* value);
+
+#if defined(CPPGC_YOUNG_GENERATION)
+  static CagedHeapLocalData& GetLocalData(HeapHandle&);
+  static void GenerationalBarrierSlow(const CagedHeapLocalData& local_data,
+                                      const AgeTable& ageTable,
+                                      const void* slot, uintptr_t value_offset);
+#endif  // CPPGC_YOUNG_GENERATION
+
+  static AtomicEntryFlag incremental_or_concurrent_marking_flag_;
+};
+
+template <WriteBarrier::Type type>
+V8_INLINE WriteBarrier::Type SetAndReturnType(WriteBarrier::Params& params) {
+  if (type == WriteBarrier::Type::kNone) return WriteBarrier::Type::kNone;
+#if V8_ENABLE_CHECKS
+  params.type = type;
+#endif  // !V8_ENABLE_CHECKS
+  return type;
+}
+
+#if defined(CPPGC_CAGED_HEAP)
+class V8_EXPORT WriteBarrierTypeForCagedHeapPolicy final {
+ public:
+  template <WriteBarrier::ValueMode value_mode, typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void* slot, const void* value,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+    return ValueModeDispatch<value_mode>::Get(slot, value, params, callback);
+  }
+
+  template <WriteBarrier::ValueMode value_mode, typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void* value,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+    return GetNoSlot(value, params, callback);
+  }
+
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type GetForExternallyReferenced(
+      const void* value, WriteBarrier::Params& params,
+      HeapHandleCallback callback) {
+    return GetNoSlot(value, params, callback);
+  }
+
+ private:
+  WriteBarrierTypeForCagedHeapPolicy() = delete;
+
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type GetNoSlot(const void* value,
+                                                WriteBarrier::Params& params,
+                                                HeapHandleCallback) {
+    if (!TryGetCagedHeap(value, value, params)) {
+      return WriteBarrier::Type::kNone;
+    }
+    if (V8_UNLIKELY(params.caged_heap().is_incremental_marking_in_progress)) {
+      return SetAndReturnType<WriteBarrier::Type::kMarking>(params);
+    }
+    return SetAndReturnType<WriteBarrier::Type::kNone>(params);
+  }
+
+  template <WriteBarrier::ValueMode value_mode>
+  struct ValueModeDispatch;
+
+  static V8_INLINE bool TryGetCagedHeap(const void* slot, const void* value,
+                                        WriteBarrier::Params& params) {
+    // TODO(chromium:1056170): Check if the null check can be folded in with
+    // the rest of the write barrier.
+    if (!value) return false;
+    params.start = reinterpret_cast<uintptr_t>(value) &
+                   ~(api_constants::kCagedHeapReservationAlignment - 1);
+    const uintptr_t slot_offset =
+        reinterpret_cast<uintptr_t>(slot) - params.start;
+    if (slot_offset > api_constants::kCagedHeapReservationSize) {
+      // Check if slot is on stack or value is sentinel or nullptr. This relies
+      // on the fact that kSentinelPointer is encoded as 0x1.
+      return false;
+    }
+    return true;
+  }
+
+  // Returns whether marking is in progress. If marking is not in progress
+  // sets the start of the cage accordingly.
+  //
+  // TODO(chromium:1056170): Create fast path on API.
+  static bool IsMarking(const HeapHandle&, WriteBarrier::Params&);
+};
+
+template <>
+struct WriteBarrierTypeForCagedHeapPolicy::ValueModeDispatch<
+    WriteBarrier::ValueMode::kValuePresent> {
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void* slot, const void* value,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback) {
+    bool within_cage = TryGetCagedHeap(slot, value, params);
+    if (!within_cage) {
+      return WriteBarrier::Type::kNone;
+    }
+    if (V8_LIKELY(!params.caged_heap().is_incremental_marking_in_progress)) {
+#if defined(CPPGC_YOUNG_GENERATION)
+      params.heap = reinterpret_cast<HeapHandle*>(params.start);
+      params.slot_offset = reinterpret_cast<uintptr_t>(slot) - params.start;
+      params.value_offset = reinterpret_cast<uintptr_t>(value) - params.start;
+      return SetAndReturnType<WriteBarrier::Type::kGenerational>(params);
+#else   // !CPPGC_YOUNG_GENERATION
+      return SetAndReturnType<WriteBarrier::Type::kNone>(params);
+#endif  // !CPPGC_YOUNG_GENERATION
+    }
+    params.heap = reinterpret_cast<HeapHandle*>(params.start);
+    return SetAndReturnType<WriteBarrier::Type::kMarking>(params);
+  }
+};
+
+template <>
+struct WriteBarrierTypeForCagedHeapPolicy::ValueModeDispatch<
+    WriteBarrier::ValueMode::kNoValuePresent> {
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void* slot, const void*,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+#if defined(CPPGC_YOUNG_GENERATION)
+    HeapHandle& handle = callback();
+    if (V8_LIKELY(!IsMarking(handle, params))) {
+      // params.start is populated by IsMarking().
+      params.heap = &handle;
+      params.slot_offset = reinterpret_cast<uintptr_t>(slot) - params.start;
+      // params.value_offset stays 0.
+      if (params.slot_offset > api_constants::kCagedHeapReservationSize) {
+        // Check if slot is on stack.
+        return SetAndReturnType<WriteBarrier::Type::kNone>(params);
+      }
+      return SetAndReturnType<WriteBarrier::Type::kGenerational>(params);
+    }
+#else   // !CPPGC_YOUNG_GENERATION
+    if (V8_LIKELY(!WriteBarrier::IsAnyIncrementalOrConcurrentMarking())) {
+      return SetAndReturnType<WriteBarrier::Type::kNone>(params);
+    }
+    HeapHandle& handle = callback();
+    if (V8_UNLIKELY(!subtle::HeapState::IsMarking(handle))) {
+      return SetAndReturnType<WriteBarrier::Type::kNone>(params);
+    }
+#endif  // !CPPGC_YOUNG_GENERATION
+    params.heap = &handle;
+    return SetAndReturnType<WriteBarrier::Type::kMarking>(params);
+  }
+};
+
+#endif  // CPPGC_CAGED_HEAP
+
+class V8_EXPORT WriteBarrierTypeForNonCagedHeapPolicy final {
+ public:
+  template <WriteBarrier::ValueMode value_mode, typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void* slot, const void* value,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+    return ValueModeDispatch<value_mode>::Get(slot, value, params, callback);
+  }
+
+  template <WriteBarrier::ValueMode value_mode, typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void* value,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+    // The slot will never be used in `Get()` below.
+    return Get<WriteBarrier::ValueMode::kValuePresent>(nullptr, value, params,
+                                                       callback);
+  }
+
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type GetForExternallyReferenced(
+      const void* value, WriteBarrier::Params& params,
+      HeapHandleCallback callback) {
+    // The slot will never be used in `Get()` below.
+    return Get<WriteBarrier::ValueMode::kValuePresent>(nullptr, value, params,
+                                                       callback);
+  }
+
+ private:
+  template <WriteBarrier::ValueMode value_mode>
+  struct ValueModeDispatch;
+
+  // TODO(chromium:1056170): Create fast path on API.
+  static bool IsMarking(const void*, HeapHandle**);
+  // TODO(chromium:1056170): Create fast path on API.
+  static bool IsMarking(HeapHandle&);
+
+  WriteBarrierTypeForNonCagedHeapPolicy() = delete;
+};
+
+template <>
+struct WriteBarrierTypeForNonCagedHeapPolicy::ValueModeDispatch<
+    WriteBarrier::ValueMode::kValuePresent> {
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void*, const void* object,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+    // The following check covers nullptr as well as sentinel pointer.
+    if (object <= static_cast<void*>(kSentinelPointer)) {
+      return WriteBarrier::Type::kNone;
+    }
+    if (IsMarking(object, &params.heap)) {
+      return SetAndReturnType<WriteBarrier::Type::kMarking>(params);
+    }
+    return SetAndReturnType<WriteBarrier::Type::kNone>(params);
+  }
+};
+
+template <>
+struct WriteBarrierTypeForNonCagedHeapPolicy::ValueModeDispatch<
+    WriteBarrier::ValueMode::kNoValuePresent> {
+  template <typename HeapHandleCallback>
+  static V8_INLINE WriteBarrier::Type Get(const void*, const void*,
+                                          WriteBarrier::Params& params,
+                                          HeapHandleCallback callback) {
+    if (V8_UNLIKELY(WriteBarrier::IsAnyIncrementalOrConcurrentMarking())) {
+      HeapHandle& handle = callback();
+      if (IsMarking(handle)) {
+        params.heap = &handle;
+        return SetAndReturnType<WriteBarrier::Type::kMarking>(params);
+      }
+    }
+    return WriteBarrier::Type::kNone;
+  }
+};
+
+// static
+WriteBarrier::Type WriteBarrier::GetWriteBarrierType(
+    const void* slot, const void* value, WriteBarrier::Params& params) {
+  return WriteBarrierTypePolicy::Get<ValueMode::kValuePresent>(slot, value,
+                                                               params, []() {});
+}
+
+// static
+template <typename HeapHandleCallback>
+WriteBarrier::Type WriteBarrier::GetWriteBarrierType(
+    const void* slot, WriteBarrier::Params& params,
+    HeapHandleCallback callback) {
+  return WriteBarrierTypePolicy::Get<ValueMode::kNoValuePresent>(
+      slot, nullptr, params, callback);
+}
+
+// static
+WriteBarrier::Type WriteBarrier::GetWriteBarrierType(
+    const void* value, WriteBarrier::Params& params) {
+  return WriteBarrierTypePolicy::Get<ValueMode::kValuePresent>(value, params,
+                                                               []() {});
+}
+
+// static
+template <typename HeapHandleCallback>
+WriteBarrier::Type
+WriteBarrier::GetWriteBarrierTypeForExternallyReferencedObject(
+    const void* value, Params& params, HeapHandleCallback callback) {
+  return WriteBarrierTypePolicy::GetForExternallyReferenced(value, params,
+                                                            callback);
+}
+
+// static
+void WriteBarrier::DijkstraMarkingBarrier(const Params& params,
+                                          const void* object) {
+  CheckParams(Type::kMarking, params);
+#if defined(CPPGC_CAGED_HEAP)
+  // Caged heap already filters out sentinels.
+  DijkstraMarkingBarrierSlow(object);
+#else   // !CPPGC_CAGED_HEAP
+  DijkstraMarkingBarrierSlowWithSentinelCheck(object);
+#endif  // !CPPGC_CAGED_HEAP
+}
+
+// static
+void WriteBarrier::DijkstraMarkingBarrierRange(const Params& params,
+                                               const void* first_element,
+                                               size_t element_size,
+                                               size_t number_of_elements,
+                                               TraceCallback trace_callback) {
+  CheckParams(Type::kMarking, params);
+  DijkstraMarkingBarrierRangeSlow(*params.heap, first_element, element_size,
+                                  number_of_elements, trace_callback);
+}
+
+// static
+void WriteBarrier::SteeleMarkingBarrier(const Params& params,
+                                        const void* object) {
+  CheckParams(Type::kMarking, params);
+#if defined(CPPGC_CAGED_HEAP)
+  // Caged heap already filters out sentinels.
+  SteeleMarkingBarrierSlow(object);
+#else   // !CPPGC_CAGED_HEAP
+  SteeleMarkingBarrierSlowWithSentinelCheck(object);
+#endif  // !CPPGC_CAGED_HEAP
+}
+
+#if defined(CPPGC_YOUNG_GENERATION)
+// static
+void WriteBarrier::GenerationalBarrier(const Params& params, const void* slot) {
+  CheckParams(Type::kGenerational, params);
+
+  const CagedHeapLocalData& local_data = params.caged_heap();
+  const AgeTable& age_table = local_data.age_table;
+
+  // Bail out if the slot is in young generation.
+  if (V8_LIKELY(age_table[params.slot_offset] == AgeTable::Age::kYoung)) return;
+
+  GenerationalBarrierSlow(local_data, age_table, slot, params.value_offset);
+}
+
+#endif  // !CPPGC_YOUNG_GENERATION
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_INTERNAL_WRITE_BARRIER_H_