deps/v8/src/objects/trusted-object-inl.h - main - githubmirror/node

deps/v8/src/objects/trusted-object-inl.h
185 строк6 KB
Michaël Zasso
deps: update V8 to 14.6.202.33
24 апр 2026, 19:01
24 апр 2026, 19:01f1e0b83
// Copyright 2023 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 V8_OBJECTS_TRUSTED_OBJECT_INL_H_
#define V8_OBJECTS_TRUSTED_OBJECT_INL_H_

#include "src/objects/trusted-object.h"
// Include the non-inl header before the rest of the headers.

#include "src/heap/heap-write-barrier-inl.h"
#include "src/objects/heap-object-inl.h"
#include "src/objects/instance-type-inl.h"
#include "src/sandbox/indirect-pointer-inl.h"
#include "src/sandbox/sandbox.h"

// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

OBJECT_CONSTRUCTORS_IMPL(TrustedObject, HeapObject)

template <typename T>
Tagged<T> TrustedObject::ReadProtectedPointerField(int offset) const {
  return TaggedField<T, 0, TrustedSpaceCompressionScheme>::load(*this, offset);
}

template <typename T>
Tagged<T> TrustedObject::ReadProtectedPointerField(int offset,
                                                   AcquireLoadTag) const {
  return TaggedField<T, 0, TrustedSpaceCompressionScheme>::Acquire_Load(*this,
                                                                        offset);
}

void TrustedObject::WriteProtectedPointerField(int offset,
                                               Tagged<TrustedObject> value) {
  TaggedField<TrustedObject, 0, TrustedSpaceCompressionScheme>::store(
      *this, offset, value);
}

void TrustedObject::WriteProtectedPointerField(int offset,
                                               Tagged<TrustedObject> value,
                                               ReleaseStoreTag) {
  TaggedField<TrustedObject, 0, TrustedSpaceCompressionScheme>::Release_Store(
      *this, offset, value);
}

bool TrustedObject::IsProtectedPointerFieldEmpty(int offset) const {
  return TaggedField<Object, 0, TrustedSpaceCompressionScheme>::load(
             *this, offset) == Smi::zero();
}

bool TrustedObject::IsProtectedPointerFieldEmpty(int offset,
                                                 AcquireLoadTag) const {
  return TaggedField<Object, 0, TrustedSpaceCompressionScheme>::Acquire_Load(
             *this, offset) == Smi::zero();
}

void TrustedObject::ClearProtectedPointerField(int offset) {
  TaggedField<Object, 0, TrustedSpaceCompressionScheme>::store(*this, offset,
                                                               Smi::zero());
}

void TrustedObject::ClearProtectedPointerField(int offset, ReleaseStoreTag) {
  TaggedField<Object, 0, TrustedSpaceCompressionScheme>::Release_Store(
      *this, offset, Smi::zero());
}

ProtectedPointerSlot TrustedObject::RawProtectedPointerField(
    int byte_offset) const {
  return ProtectedPointerSlot(field_address(byte_offset));
}

ProtectedMaybeObjectSlot TrustedObject::RawProtectedMaybeObjectField(
    int byte_offset) const {
  return ProtectedMaybeObjectSlot(field_address(byte_offset));
}

#ifdef VERIFY_HEAP
void TrustedObject::VerifyProtectedPointerField(Isolate* isolate, int offset) {
  Object::VerifyPointer(isolate, ReadProtectedPointerField(offset));
}
#endif

OBJECT_CONSTRUCTORS_IMPL(ExposedTrustedObject, TrustedObject)

void ExposedTrustedObject::InitAndPublish(Isolate* isolate) {
#ifdef V8_ENABLE_SANDBOX
  InitSelfIndirectPointerField(kSelfIndirectPointerOffset, isolate,
                               isolate->trusted_pointer_publishing_scope());
#endif
}

void ExposedTrustedObject::InitAndPublish(LocalIsolate* isolate) {
#ifdef V8_ENABLE_SANDBOX
  // Background threads using LocalIsolates don't use
  // TrustedPointerPublishingScopes.
  InitSelfIndirectPointerField(kSelfIndirectPointerOffset, isolate, nullptr);
#endif
}

void ExposedTrustedObject::InitDontPublish(Isolate* isolate) {
#ifdef V8_ENABLE_SANDBOX
  InitSelfIndirectPointerFieldWithoutPublishing(kSelfIndirectPointerOffset,
                                                isolate);
#endif
}

void ExposedTrustedObject::InitDontPublish(LocalIsolate* isolate) {
#ifdef V8_ENABLE_SANDBOX
  InitSelfIndirectPointerFieldWithoutPublishing(kSelfIndirectPointerOffset,
                                                isolate);
#endif
}

void ExposedTrustedObject::Publish(IsolateForSandbox isolate) {
#ifdef V8_ENABLE_SANDBOX
  DCHECK(!IsPublished(isolate));
  // Currently only non-shared objects can be unpublished. We could change that
  // in the future, which would probably require a new shared+unpublished tag.
  DCHECK(!HeapLayout::InAnySharedSpace(*this));

  InstanceType instance_type = map()->instance_type();
  IndirectPointerTag tag =
      IndirectPointerTagFromInstanceType(instance_type, false);
  IndirectPointerHandle handle =
      ACQUIRE_READ_UINT32_FIELD(*this, kSelfIndirectPointerOffset);
  TrustedPointerTable& table = isolate.GetTrustedPointerTableFor(tag);
  return table.Publish(handle, tag);
#endif
}

bool ExposedTrustedObject::IsPublished(IsolateForSandbox isolate) const {
#ifdef V8_ENABLE_SANDBOX
  InstanceType instance_type = map()->instance_type();
  IndirectPointerTag tag =
      IndirectPointerTagFromInstanceType(instance_type, false);
  return !IsTrustedPointerFieldUnpublished(kSelfIndirectPointerOffset, tag,
                                           isolate);
#else
  return true;
#endif
}

IndirectPointerHandle ExposedTrustedObject::self_indirect_pointer_handle()
    const {
#ifdef V8_ENABLE_SANDBOX
  return Relaxed_ReadField<IndirectPointerHandle>(kSelfIndirectPointerOffset);
#else
  UNREACHABLE();
#endif
}

void ExposedTrustedObjectLayout::InitAndPublish(Isolate* isolate) {
#ifdef V8_ENABLE_SANDBOX
  InitSelfIndirectPointerField(&self_indirect_pointer_, isolate,
                               isolate->trusted_pointer_publishing_scope());
#endif
}

void ExposedTrustedObjectLayout::InitAndPublish(LocalIsolate* isolate) {
#ifdef V8_ENABLE_SANDBOX
  // Background threads using LocalIsolates don't use
  // TrustedPointerPublishingScopes.
  InitSelfIndirectPointerField(&self_indirect_pointer_, isolate, nullptr);
#endif
}

IndirectPointerHandle ExposedTrustedObjectLayout::self_indirect_pointer_handle()
    const {
#ifdef V8_ENABLE_SANDBOX
  return self_indirect_pointer_.load(std::memory_order::relaxed);
#else
  UNREACHABLE();
#endif
}

}  // namespace internal
}  // namespace v8

#include "src/objects/object-macros-undef.h"

#endif  // V8_OBJECTS_TRUSTED_OBJECT_INL_H_