src/objects/object-predicates-inl.h

// Copyright 2026 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_OBJECT_PREDICATES_INL_H_
#define V8_OBJECTS_OBJECT_PREDICATES_INL_H_

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

#include "src/common/globals.h"
#include "src/heap/heap-layout-inl.h"
#include "src/objects/casting.h"
#include "src/objects/heap-object-inl.h"
#include "src/objects/smi.h"
#include "src/objects/tagged-index.h"
#include "src/roots/roots.h"

namespace v8::internal {

bool IsTaggedIndex(Tagged<Object> obj) {
  return IsSmi(obj) &&
         TaggedIndex::IsValid(Tagged<TaggedIndex>(obj.ptr()).value());
}

bool IsZero(Tagged<Object> obj) { return obj == Smi::zero(); }

bool IsNoSharedNameSentinel(Tagged<Object> obj) {
  return obj == SharedFunctionInfo::kNoSharedNameSentinel;
}

bool IsJSObjectThatCanBeTrackedAsPrototype(Tagged<Object> obj) {
  return IsHeapObject(obj) &&
         IsJSObjectThatCanBeTrackedAsPrototype(Cast<HeapObject>(obj));
}

bool IsJSObjectThatCanBeTrackedAsPrototype(Tagged<HeapObject> obj) {
  return IsJSObject(obj) && !HeapLayout::InWritableSharedSpace(obj);
}

bool IsAnyObjectThatCanBeTrackedAsPrototype(Tagged<Object> obj) {
  return IsHeapObject(obj) &&
         IsAnyObjectThatCanBeTrackedAsPrototype(Cast<HeapObject>(obj));
}

bool IsAnyObjectThatCanBeTrackedAsPrototype(Tagged<HeapObject> obj) {
  return (IsJSObject(obj) || IsWasmObject(obj)) &&
         !HeapLayout::InWritableSharedSpace(obj);
}

bool IsNumber(Tagged<Object> obj) {
  if (IsSmi(obj)) return true;
  return IsHeapNumber(Cast<HeapObject>(obj));
}

bool IsNumeric(Tagged<Object> obj) {
  if (IsSmi(obj)) return true;
  Tagged<HeapObject> heap_object = Cast<HeapObject>(obj);
  return IsHeapNumber(heap_object) || IsBigInt(heap_object);
}

bool IsShared(Tagged<Object> obj) {
  // This logic should be kept in sync with fast paths in
  // CodeStubAssembler::SharedValueBarrier.

  // Smis are trivially shared.
  if (IsSmi(obj)) return true;

  Tagged<HeapObject> object = Cast<HeapObject>(obj);

  // RO objects are shared when the RO space is shared.
  if (HeapLayout::InReadOnlySpace(object)) {
    return true;
  }

  // Check if this object is already shared.
  InstanceType instance_type = object->map()->instance_type();
  if (InstanceTypeChecker::IsAlwaysSharedSpaceJSObject(instance_type)) {
    DCHECK(HeapLayout::InAnySharedSpace(object));
    return true;
  }
  switch (instance_type) {
    case SHARED_SEQ_TWO_BYTE_STRING_TYPE:
    case SHARED_SEQ_ONE_BYTE_STRING_TYPE:
    case SHARED_EXTERNAL_TWO_BYTE_STRING_TYPE:
    case SHARED_EXTERNAL_ONE_BYTE_STRING_TYPE:
    case SHARED_UNCACHED_EXTERNAL_TWO_BYTE_STRING_TYPE:
    case SHARED_UNCACHED_EXTERNAL_ONE_BYTE_STRING_TYPE:
      DCHECK(HeapLayout::InAnySharedSpace(object));
      return true;
#if V8_ENABLE_WEBASSEMBLY
    case WASM_STRUCT_TYPE:
    case WASM_ARRAY_TYPE:
      return HeapLayout::InAnySharedSpace(object);
#endif
    case INTERNALIZED_TWO_BYTE_STRING_TYPE:
    case INTERNALIZED_ONE_BYTE_STRING_TYPE:
    case EXTERNAL_INTERNALIZED_TWO_BYTE_STRING_TYPE:
    case EXTERNAL_INTERNALIZED_ONE_BYTE_STRING_TYPE:
    case UNCACHED_EXTERNAL_INTERNALIZED_TWO_BYTE_STRING_TYPE:
    case UNCACHED_EXTERNAL_INTERNALIZED_ONE_BYTE_STRING_TYPE:
      if (v8_flags.shared_string_table) {
        DCHECK(HeapLayout::InAnySharedSpace(object));
        return true;
      }
      return false;
    case HEAP_NUMBER_TYPE:
      return HeapLayout::InWritableSharedSpace(object);
    default:
      return false;
  }
}

}  // namespace v8::internal

#endif  // V8_OBJECTS_OBJECT_PREDICATES_INL_H_