text: // Copyright 2012 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.
  
  #include "src/objects.h"
  
  #include <iomanip>
  #include <memory>
  
  #include "src/bootstrapper.h"
  #include "src/disasm.h"
  #include "src/disassembler.h"
  #include "src/interpreter/bytecodes.h"
  #include "src/objects-inl.h"
  #include "src/objects/arguments-inl.h"
  #include "src/objects/data-handler-inl.h"
  #include "src/objects/debug-objects-inl.h"
  #include "src/objects/embedder-data-array-inl.h"
  #include "src/objects/embedder-data-slot-inl.h"
  #include "src/objects/hash-table-inl.h"
  #include "src/objects/js-array-buffer-inl.h"
  #include "src/objects/js-array-inl.h"
  #include "src/snapshot/embedded-data.h"
  #ifdef V8_INTL_SUPPORT
  #include "src/objects/js-break-iterator-inl.h"
  #include "src/objects/js-collator-inl.h"
  #endif  // V8_INTL_SUPPORT
  #include "src/objects/js-collection-inl.h"
  #ifdef V8_INTL_SUPPORT
  #include "src/objects/js-date-time-format-inl.h"
  #endif  // V8_INTL_SUPPORT
  #include "src/objects/js-generator-inl.h"
  #ifdef V8_INTL_SUPPORT
  #include "src/objects/js-list-format-inl.h"
  #include "src/objects/js-locale-inl.h"
  #include "src/objects/js-number-format-inl.h"
  #include "src/objects/js-plural-rules-inl.h"
  #endif  // V8_INTL_SUPPORT
  #include "src/objects/js-regexp-inl.h"
  #include "src/objects/js-regexp-string-iterator-inl.h"
  #ifdef V8_INTL_SUPPORT
  #include "src/objects/js-relative-time-format-inl.h"
  #include "src/objects/js-segment-iterator-inl.h"
  #include "src/objects/js-segmenter-inl.h"
  #endif  // V8_INTL_SUPPORT
  #include "src/objects/js-weak-refs-inl.h"
  #include "src/objects/literal-objects-inl.h"
  #include "src/objects/microtask-inl.h"
  #include "src/objects/module-inl.h"
  #include "src/objects/promise-inl.h"
  #include "src/objects/stack-frame-info-inl.h"
  #include "src/ostreams.h"
  #include "src/regexp/jsregexp.h"
  #include "src/transitions-inl.h"
  #include "src/wasm/wasm-code-manager.h"
  #include "src/wasm/wasm-engine.h"
  #include "src/wasm/wasm-objects-inl.h"
  
  namespace v8 {
  namespace internal {
  
  #ifdef OBJECT_PRINT
  
  void Object::Print() {
    StdoutStream os;
    this->Print(os);
    os << std::flush;
  }
  
  void Object::Print(std::ostream& os) {  // NOLINT
    if (IsSmi()) {
      os << "Smi: " << std::hex << "0x" << Smi::ToInt(this);
      os << std::dec << " (" << Smi::ToInt(this) << ")\n";
    } else {
      HeapObject::cast(this)->HeapObjectPrint(os);
    }
  }
  
  void HeapObject::PrintHeader(std::ostream& os, const char* id) {  // NOLINT
    os << reinterpret_cast<void*>(this) << ": [";
    if (id != nullptr) {
      os << id;
    } else {
      os << map()->instance_type();
    }
    os << "]";
    MemoryChunk* chunk = MemoryChunk::FromAddress(
        reinterpret_cast<Address>(const_cast<HeapObject*>(this)));
    if (chunk->owner()->identity() == OLD_SPACE) os << " in OldSpace";
    if (!IsMap()) os << "\n - map: " << Brief(map());
  }
  
  void HeapObjectPtr::PrintHeader(std::ostream& os, const char* id) {  // NOLINT
    os << reinterpret_cast<void*>(ptr()) << ": [";
    if (id != nullptr) {
      os << id;
    } else {
      os << map()->instance_type();
    }
    os << "]";
    MemoryChunk* chunk = MemoryChunk::FromAddress(ptr());
    if (chunk->owner()->identity() == OLD_SPACE) os << " in OldSpace";
    if (!IsMap()) os << "\n - map: " << Brief(map());
  }
  
  void HeapObject::HeapObjectPrint(std::ostream& os) {  // NOLINT
    InstanceType instance_type = map()->instance_type();
  
    if (instance_type < FIRST_NONSTRING_TYPE) {
      String::cast(this)->StringPrint(os);
      os << "\n";
      return;
    }
  
    switch (instance_type) {
      case SYMBOL_TYPE:
        Symbol::cast(this)->SymbolPrint(os);
        break;
      case MAP_TYPE:
        Map::cast(this)->MapPrint(os);
        break;
      case HEAP_NUMBER_TYPE:
        HeapNumber::cast(this)->HeapNumberPrint(os);
        os << "\n";
        break;
      case MUTABLE_HEAP_NUMBER_TYPE:
        os << "<mutable ";
        MutableHeapNumber::cast(this)->MutableHeapNumberPrint(os);
        os << ">\n";
        break;
      case BIGINT_TYPE:
        BigInt::cast(this)->BigIntPrint(os);
        os << "\n";
        break;
      case EMBEDDER_DATA_ARRAY_TYPE:
        EmbedderDataArray::cast(this)->EmbedderDataArrayPrint(os);
        break;
      case FIXED_DOUBLE_ARRAY_TYPE:
        FixedDoubleArray::cast(this)->FixedDoubleArrayPrint(os);
        break;
      case FIXED_ARRAY_TYPE:
        FixedArray::cast(this)->FixedArrayPrint(os);
        break;
      case AWAIT_CONTEXT_TYPE:
      case BLOCK_CONTEXT_TYPE:
      case CATCH_CONTEXT_TYPE:
      case DEBUG_EVALUATE_CONTEXT_TYPE:
      case EVAL_CONTEXT_TYPE:
      case FUNCTION_CONTEXT_TYPE:
      case MODULE_CONTEXT_TYPE:
      case SCRIPT_CONTEXT_TYPE:
      case WITH_CONTEXT_TYPE:
      case SCRIPT_CONTEXT_TABLE_TYPE:
        Context::cast(this)->ContextPrint(os);
        break;
      case NATIVE_CONTEXT_TYPE:
        NativeContext::cast(this)->NativeContextPrint(os);
        break;
      case HASH_TABLE_TYPE:
      case ORDERED_HASH_MAP_TYPE:
      case ORDERED_HASH_SET_TYPE:
      case ORDERED_NAME_DICTIONARY_TYPE:
      case NAME_DICTIONARY_TYPE:
      case GLOBAL_DICTIONARY_TYPE:
      case SIMPLE_NUMBER_DICTIONARY_TYPE:
      case STRING_TABLE_TYPE:
        ObjectHashTable::cast(this)->ObjectHashTablePrint(os);
        break;
      case NUMBER_DICTIONARY_TYPE:
        NumberDictionary::cast(this)->NumberDictionaryPrint(os);
        break;
      case EPHEMERON_HASH_TABLE_TYPE:
        EphemeronHashTable::cast(this)->EphemeronHashTablePrint(os);
        break;
      case OBJECT_BOILERPLATE_DESCRIPTION_TYPE:
        ObjectBoilerplateDescription::cast(this)
            ->ObjectBoilerplateDescriptionPrint(os);
        break;
      case PROPERTY_ARRAY_TYPE:
        PropertyArray::cast(this)->PropertyArrayPrint(os);
        break;
      case BYTE_ARRAY_TYPE:
        ByteArray::cast(this)->ByteArrayPrint(os);
        break;
      case BYTECODE_ARRAY_TYPE:
        BytecodeArray::cast(this)->BytecodeArrayPrint(os);
        break;
      case DESCRIPTOR_ARRAY_TYPE:
        DescriptorArray::cast(this)->DescriptorArrayPrint(os);
        break;
      case TRANSITION_ARRAY_TYPE:
        TransitionArray::cast(this)->TransitionArrayPrint(os);
        break;
      case FEEDBACK_CELL_TYPE:
        FeedbackCell::cast(this)->FeedbackCellPrint(os);
        break;
      case FEEDBACK_VECTOR_TYPE:
        FeedbackVector::cast(this)->FeedbackVectorPrint(os);
        break;
      case FREE_SPACE_TYPE:
        FreeSpace::cast(this)->FreeSpacePrint(os);
        break;
  
  #define PRINT_FIXED_TYPED_ARRAY(Type, type, TYPE, ctype)      \
    case Fixed##Type##Array::kInstanceType:                     \
      Fixed##Type##Array::cast(this)->FixedTypedArrayPrint(os); \
      break;
  
        TYPED_ARRAYS(PRINT_FIXED_TYPED_ARRAY)
  #undef PRINT_FIXED_TYPED_ARRAY
  
      case FILLER_TYPE:
        os << "filler";
        break;
      case JS_OBJECT_TYPE:  // fall through
      case JS_API_OBJECT_TYPE:
      case JS_SPECIAL_API_OBJECT_TYPE:
      case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
      case JS_ASYNC_FUNCTION_OBJECT_TYPE:
      case JS_ASYNC_GENERATOR_OBJECT_TYPE:
      case JS_ARGUMENTS_TYPE:
      case JS_ERROR_TYPE:
      // TODO(titzer): debug printing for more wasm objects
      case WASM_EXCEPTION_TYPE:
      case WASM_GLOBAL_TYPE:
      case WASM_MEMORY_TYPE:
      case WASM_TABLE_TYPE:
        JSObject::cast(this)->JSObjectPrint(os);
        break;
      case WASM_MODULE_TYPE:
        WasmModuleObject::cast(this)->WasmModuleObjectPrint(os);
        break;
      case WASM_INSTANCE_TYPE:
        WasmInstanceObject::cast(this)->WasmInstanceObjectPrint(os);
        break;
      case JS_GENERATOR_OBJECT_TYPE:
        JSGeneratorObject::cast(this)->JSGeneratorObjectPrint(os);
        break;
      case JS_PROMISE_TYPE:
        JSPromise::cast(this)->JSPromisePrint(os);
        break;
      case JS_ARRAY_TYPE:
        JSArray::cast(this)->JSArrayPrint(os);
        break;
      case JS_REGEXP_TYPE:
        JSRegExp::cast(this)->JSRegExpPrint(os);
        break;
      case JS_REGEXP_STRING_ITERATOR_TYPE:
        JSRegExpStringIterator::cast(this)->JSRegExpStringIteratorPrint(os);
        break;
      case ODDBALL_TYPE:
        Oddball::cast(this)->to_string()->Print(os);
        break;
      case JS_BOUND_FUNCTION_TYPE:
        JSBoundFunction::cast(this)->JSBoundFunctionPrint(os);
        break;
      case JS_FUNCTION_TYPE:
        JSFunction::cast(this)->JSFunctionPrint(os);
        break;
      case JS_GLOBAL_PROXY_TYPE:
        JSGlobalProxy::cast(this)->JSGlobalProxyPrint(os);
        break;
      case JS_GLOBAL_OBJECT_TYPE:
        JSGlobalObject::cast(this)->JSGlobalObjectPrint(os);
        break;
      case JS_VALUE_TYPE:
        JSValue::cast(this)->JSValuePrint(os);
        break;
      case JS_DATE_TYPE:
        JSDate::cast(this)->JSDatePrint(os);
        break;
      case CODE_TYPE:
        Code::cast(this)->CodePrint(os);
        break;
      case CODE_DATA_CONTAINER_TYPE:
        CodeDataContainer::cast(this)->CodeDataContainerPrint(os);
        break;
      case JS_PROXY_TYPE:
        JSProxy::cast(this)->JSProxyPrint(os);
        break;
      case JS_SET_TYPE:
        JSSet::cast(this)->JSSetPrint(os);
        break;
      case JS_MAP_TYPE:
        JSMap::cast(this)->JSMapPrint(os);
        break;
      case JS_SET_KEY_VALUE_ITERATOR_TYPE:
      case JS_SET_VALUE_ITERATOR_TYPE:
        JSSetIterator::cast(this)->JSSetIteratorPrint(os);
        break;
      case JS_MAP_KEY_ITERATOR_TYPE:
      case JS_MAP_KEY_VALUE_ITERATOR_TYPE:
      case JS_MAP_VALUE_ITERATOR_TYPE:
        JSMapIterator::cast(this)->JSMapIteratorPrint(os);
        break;
      case JS_WEAK_CELL_TYPE:
      case JS_WEAK_REF_TYPE:
        JSWeakCell::cast(this)->JSWeakCellPrint(os);
        break;
      case JS_WEAK_FACTORY_TYPE:
        JSWeakFactory::cast(this)->JSWeakFactoryPrint(os);
        break;
      case JS_WEAK_FACTORY_CLEANUP_ITERATOR_TYPE:
        JSWeakFactoryCleanupIterator::cast(this)
            ->JSWeakFactoryCleanupIteratorPrint(os);
        break;
      case JS_WEAK_MAP_TYPE:
        JSWeakMap::cast(this)->JSWeakMapPrint(os);
        break;
      case JS_WEAK_SET_TYPE:
        JSWeakSet::cast(this)->JSWeakSetPrint(os);
        break;
      case JS_MODULE_NAMESPACE_TYPE:
        JSModuleNamespace::cast(this)->JSModuleNamespacePrint(os);
        break;
      case FOREIGN_TYPE:
        Foreign::cast(this)->ForeignPrint(os);
        break;
      case CALL_HANDLER_INFO_TYPE:
        CallHandlerInfo::cast(this)->CallHandlerInfoPrint(os);
        break;
      case PRE_PARSED_SCOPE_DATA_TYPE:
        PreParsedScopeData::cast(this)->PreParsedScopeDataPrint(os);
        break;
      case UNCOMPILED_DATA_WITHOUT_PRE_PARSED_SCOPE_TYPE:
        UncompiledDataWithoutPreParsedScope::cast(this)
            ->UncompiledDataWithoutPreParsedScopePrint(os);
        break;
      case UNCOMPILED_DATA_WITH_PRE_PARSED_SCOPE_TYPE:
        UncompiledDataWithPreParsedScope::cast(this)
            ->UncompiledDataWithPreParsedScopePrint(os);
        break;
      case SHARED_FUNCTION_INFO_TYPE:
        SharedFunctionInfo::cast(this)->SharedFunctionInfoPrint(os);
        break;
      case JS_MESSAGE_OBJECT_TYPE:
        JSMessageObject::cast(this)->JSMessageObjectPrint(os);
        break;
      case CELL_TYPE:
        Cell::cast(this)->CellPrint(os);
        break;
      case PROPERTY_CELL_TYPE:
        PropertyCell::cast(this)->PropertyCellPrint(os);
        break;
      case JS_ARRAY_BUFFER_TYPE:
        JSArrayBuffer::cast(this)->JSArrayBufferPrint(os);
        break;
      case JS_ARRAY_ITERATOR_TYPE:
        JSArrayIterator::cast(this)->JSArrayIteratorPrint(os);
        break;
      case JS_TYPED_ARRAY_TYPE:
        JSTypedArray::cast(this)->JSTypedArrayPrint(os);
        break;
      case JS_DATA_VIEW_TYPE:
        JSDataView::cast(this)->JSDataViewPrint(os);
        break;
  #ifdef V8_INTL_SUPPORT
      case JS_INTL_V8_BREAK_ITERATOR_TYPE:
        JSV8BreakIterator::cast(this)->JSV8BreakIteratorPrint(os);
        break;
      case JS_INTL_COLLATOR_TYPE:
        JSCollator::cast(this)->JSCollatorPrint(os);
        break;
      case JS_INTL_DATE_TIME_FORMAT_TYPE:
        JSDateTimeFormat::cast(this)->JSDateTimeFormatPrint(os);
        break;
      case JS_INTL_LIST_FORMAT_TYPE:
        JSListFormat::cast(this)->JSListFormatPrint(os);
        break;
      case JS_INTL_LOCALE_TYPE:
        JSLocale::cast(this)->JSLocalePrint(os);
        break;
      case JS_INTL_NUMBER_FORMAT_TYPE:
        JSNumberFormat::cast(this)->JSNumberFormatPrint(os);
        break;
      case JS_INTL_PLURAL_RULES_TYPE:
        JSPluralRules::cast(this)->JSPluralRulesPrint(os);
        break;
      case JS_INTL_RELATIVE_TIME_FORMAT_TYPE:
        JSRelativeTimeFormat::cast(this)->JSRelativeTimeFormatPrint(os);
        break;
      case JS_INTL_SEGMENT_ITERATOR_TYPE:
        JSSegmentIterator::cast(this)->JSSegmentIteratorPrint(os);
        break;
      case JS_INTL_SEGMENTER_TYPE:
        JSSegmenter::cast(this)->JSSegmenterPrint(os);
        break;
  #endif  // V8_INTL_SUPPORT
  #define MAKE_STRUCT_CASE(TYPE, Name, name) \
    case TYPE:                               \
      Name::cast(this)->Name##Print(os);     \
      break;
        STRUCT_LIST(MAKE_STRUCT_CASE)
  #undef MAKE_STRUCT_CASE
  
      case ALLOCATION_SITE_TYPE:
        AllocationSite::cast(this)->AllocationSitePrint(os);
        break;
      case LOAD_HANDLER_TYPE:
        LoadHandler::cast(this)->LoadHandlerPrint(os);
        break;
      case STORE_HANDLER_TYPE:
        StoreHandler::cast(this)->StoreHandlerPrint(os);
        break;
      case SCOPE_INFO_TYPE:
        ScopeInfo::cast(this)->ScopeInfoPrint(os);
        break;
      case FEEDBACK_METADATA_TYPE:
        FeedbackMetadata::cast(this)->FeedbackMetadataPrint(os);
        break;
      case WEAK_FIXED_ARRAY_TYPE:
        WeakFixedArray::cast(this)->WeakFixedArrayPrint(os);
        break;
      case WEAK_ARRAY_LIST_TYPE:
        WeakArrayList::cast(this)->WeakArrayListPrint(os);
        break;
      case INTERNALIZED_STRING_TYPE:
      case EXTERNAL_INTERNALIZED_STRING_TYPE:
      case ONE_BYTE_INTERNALIZED_STRING_TYPE:
      case EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE:
      case EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE:
      case UNCACHED_EXTERNAL_INTERNALIZED_STRING_TYPE:
      case UNCACHED_EXTERNAL_ONE_BYTE_INTERNALIZED_STRING_TYPE:
      case UNCACHED_EXTERNAL_INTERNALIZED_STRING_WITH_ONE_BYTE_DATA_TYPE:
      case STRING_TYPE:
      case CONS_STRING_TYPE:
      case EXTERNAL_STRING_TYPE:
      case SLICED_STRING_TYPE:
      case THIN_STRING_TYPE:
      case ONE_BYTE_STRING_TYPE:
      case CONS_ONE_BYTE_STRING_TYPE:
      case EXTERNAL_ONE_BYTE_STRING_TYPE:
      case SLICED_ONE_BYTE_STRING_TYPE:
      case THIN_ONE_BYTE_STRING_TYPE:
      case EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE:
      case UNCACHED_EXTERNAL_STRING_TYPE:
      case UNCACHED_EXTERNAL_ONE_BYTE_STRING_TYPE:
      case UNCACHED_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE:
      case SMALL_ORDERED_HASH_MAP_TYPE:
      case SMALL_ORDERED_HASH_SET_TYPE:
      case SMALL_ORDERED_NAME_DICTIONARY_TYPE:
      case JS_ASYNC_FROM_SYNC_ITERATOR_TYPE:
      case JS_STRING_ITERATOR_TYPE:
        // TODO(all): Handle these types too.
        os << "UNKNOWN TYPE " << map()->instance_type();
        UNREACHABLE();
        break;
    }
  }
  
  void ByteArray::ByteArrayPrint(std::ostream& os) {  // NOLINT
    os << "byte array, data starts at "
       << static_cast<void*>(GetDataStartAddress());
  }
  
  void BytecodeArray::BytecodeArrayPrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "BytecodeArray");
    Disassemble(os);
  }
  
  
  void FreeSpace::FreeSpacePrint(std::ostream& os) {  // NOLINT
    os << "free space, size " << Size();
  }
  
  
  template <class Traits>
  void FixedTypedArray<Traits>::FixedTypedArrayPrint(
      std::ostream& os) {  // NOLINT
    os << "fixed " << Traits::Designator();
  }
  
  bool JSObject::PrintProperties(std::ostream& os) {  // NOLINT
    if (HasFastProperties()) {
      DescriptorArray* descs = map()->instance_descriptors();
      int nof_inobject_properties = map()->GetInObjectProperties();
      int i = 0;
      for (; i < map()->NumberOfOwnDescriptors(); i++) {
        os << "\n    ";
        descs->GetKey(i)->NamePrint(os);
        os << ": ";
        PropertyDetails details = descs->GetDetails(i);
        switch (details.location()) {
          case kField: {
            FieldIndex field_index = FieldIndex::ForDescriptor(map(), i);
            if (IsUnboxedDoubleField(field_index)) {
              os << "<unboxed double> " << RawFastDoublePropertyAt(field_index);
            } else {
              os << Brief(RawFastPropertyAt(field_index));
            }
            break;
          }
          case kDescriptor:
            os << Brief(descs->GetStrongValue(i));
            break;
        }
        os << " ";
        details.PrintAsFastTo(os, PropertyDetails::kForProperties);
        if (details.location() != kField) continue;
        int field_index = details.field_index();
        if (nof_inobject_properties <= field_index) {
          field_index -= nof_inobject_properties;
          os << " properties[" << field_index << "]";
        }
      }
      return i > 0;
    } else if (IsJSGlobalObject()) {
      JSGlobalObject::cast(this)->global_dictionary()->Print(os);
    } else {
      property_dictionary()->Print(os);
    }
    return true;
  }
  
  namespace {
  
  template <class T>
  bool IsTheHoleAt(T array, int index) {
    return false;
  }
  
  template <>
  bool IsTheHoleAt(FixedDoubleArray array, int index) {
    return array->is_the_hole(index);
  }
  
  template <class T>
  double GetScalarElement(T array, int index) {
    if (IsTheHoleAt(array, index)) {
      return std::numeric_limits<double>::quiet_NaN();
    }
    return array->get_scalar(index);
  }
  
  template <class T>
  void DoPrintElements(std::ostream& os, Object* object) {  // NOLINT
    const bool print_the_hole = std::is_same<T, FixedDoubleArray>::value;
    T array = T::cast(object);
    if (array->length() == 0) return;
    int previous_index = 0;
    double previous_value = GetScalarElement(array, 0);
    double value = 0.0;
    int i;
    for (i = 1; i <= array->length(); i++) {
      if (i < array->length()) value = GetScalarElement(array, i);
      bool values_are_nan = std::isnan(previous_value) && std::isnan(value);
      if (i != array->length() && (previous_value == value || values_are_nan) &&
          IsTheHoleAt(array, i - 1) == IsTheHoleAt(array, i)) {
        continue;
      }
      os << "\n";
      std::stringstream ss;
      ss << previous_index;
      if (previous_index != i - 1) {
        ss << '-' << (i - 1);
      }
      os << std::setw(12) << ss.str() << ": ";
      if (print_the_hole && IsTheHoleAt(array, i - 1)) {
        os << "<the_hole>";
      } else {
        os << previous_value;
      }
      previous_index = i;
      previous_value = value;
    }
  }
  
  template <typename T>
  void PrintFixedArrayElements(std::ostream& os, T array) {
    // Print in array notation for non-sparse arrays.
    Object* previous_value = array->length() > 0 ? array->get(0) : nullptr;
    Object* value = nullptr;
    int previous_index = 0;
    int i;
    for (i = 1; i <= array->length(); i++) {
      if (i < array->length()) value = array->get(i);
      if (previous_value == value && i != array->length()) {
        continue;
      }
      os << "\n";
      std::stringstream ss;
      ss << previous_index;
      if (previous_index != i - 1) {
        ss << '-' << (i - 1);
      }
      os << std::setw(12) << ss.str() << ": " << Brief(previous_value);
      previous_index = i;
      previous_value = value;
    }
  }
  
  void PrintDictionaryElements(std::ostream& os, FixedArrayBase elements) {
    // Print some internal fields
    NumberDictionary dict = NumberDictionary::cast(elements);
    if (dict->requires_slow_elements()) {
      os << "\n   - requires_slow_elements";
    } else {
      os << "\n   - max_number_key: " << dict->max_number_key();
    }
    dict->Print(os);
  }
  
  void PrintSloppyArgumentElements(std::ostream& os, ElementsKind kind,
                                   SloppyArgumentsElements elements) {
    FixedArray arguments_store = elements->arguments();
    os << "\n    0: context: " << Brief(elements->context())
       << "\n    1: arguments_store: " << Brief(arguments_store)
       << "\n    parameter to context slot map:";
    for (uint32_t i = 0; i < elements->parameter_map_length(); i++) {
      uint32_t raw_index = i + SloppyArgumentsElements::kParameterMapStart;
      Object* mapped_entry = elements->get_mapped_entry(i);
      os << "\n    " << raw_index << ": param(" << i
         << "): " << Brief(mapped_entry);
      if (mapped_entry->IsTheHole()) {
        os << " in the arguments_store[" << i << "]";
      } else {
        os << " in the context";
      }
    }
    if (arguments_store->length() == 0) return;
    os << "\n }"
       << "\n - arguments_store: " << Brief(arguments_store) << " "
       << ElementsKindToString(arguments_store->map()->elements_kind()) << " {";
    if (kind == FAST_SLOPPY_ARGUMENTS_ELEMENTS) {
      PrintFixedArrayElements(os, arguments_store);
    } else {
      DCHECK_EQ(kind, SLOW_SLOPPY_ARGUMENTS_ELEMENTS);
      PrintDictionaryElements(os, arguments_store);
    }
  }
  
  void PrintEmbedderData(std::ostream& os, EmbedderDataSlot slot) {
    DisallowHeapAllocation no_gc;
    Object* value = slot.load_tagged();
    os << Brief(value);
    void* raw_pointer;
    if (slot.ToAlignedPointer(&raw_pointer)) {
      os << ", aligned pointer: " << raw_pointer;
    }
  }
  
  }  // namespace
  
  void JSObject::PrintElements(std::ostream& os) {  // NOLINT
    // Don't call GetElementsKind, its validation code can cause the printer to
    // fail when debugging.
    os << " - elements: " << Brief(elements()) << " {";
    if (elements()->length() == 0) {
      os << " }\n";
      return;
    }
    switch (map()->elements_kind()) {
      case HOLEY_SMI_ELEMENTS:
      case PACKED_SMI_ELEMENTS:
      case HOLEY_ELEMENTS:
      case PACKED_ELEMENTS:
      case FAST_STRING_WRAPPER_ELEMENTS: {
        PrintFixedArrayElements(os, FixedArray::cast(elements()));
        break;
      }
      case HOLEY_DOUBLE_ELEMENTS:
      case PACKED_DOUBLE_ELEMENTS: {
        DoPrintElements<FixedDoubleArray>(os, elements());
        break;
      }
  
  #define PRINT_ELEMENTS(Type, type, TYPE, elementType)    \
    case TYPE##_ELEMENTS: {                                \
      DoPrintElements<Fixed##Type##Array>(os, elements()); \
      break;                                               \
    }
        TYPED_ARRAYS(PRINT_ELEMENTS)
  #undef PRINT_ELEMENTS
  
      case DICTIONARY_ELEMENTS:
      case SLOW_STRING_WRAPPER_ELEMENTS:
        PrintDictionaryElements(os, elements());
        break;
      case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
      case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
        PrintSloppyArgumentElements(os, map()->elements_kind(),
                                    SloppyArgumentsElements::cast(elements()));
        break;
      case NO_ELEMENTS:
        break;
    }
    os << "\n }\n";
  }
  
  static void JSObjectPrintHeader(std::ostream& os, JSObject* obj,
                                  const char* id) {  // NOLINT
    Isolate* isolate = obj->GetIsolate();
    obj->PrintHeader(os, id);
    // Don't call GetElementsKind, its validation code can cause the printer to
    // fail when debugging.
    os << " [";
    if (obj->HasFastProperties()) {
      os << "FastProperties";
    } else {
      os << "DictionaryProperties";
    }
    PrototypeIterator iter(isolate, obj);
    os << "]\n - prototype: " << Brief(iter.GetCurrent());
    os << "\n - elements: " << Brief(obj->elements()) << " ["
       << ElementsKindToString(obj->map()->elements_kind());
    if (obj->elements()->IsCowArray()) os << " (COW)";
    os << "]";
    Object* hash = obj->GetHash();
    if (hash->IsSmi()) {
      os << "\n - hash: " << Brief(hash);
    }
    if (obj->GetEmbedderFieldCount() > 0) {
      os << "\n - embedder fields: " << obj->GetEmbedderFieldCount();
    }
  }
  
  static void JSObjectPrintBody(std::ostream& os,
                                JSObject* obj,  // NOLINT
                                bool print_elements = true) {
    os << "\n - properties: ";
    Object* properties_or_hash = obj->raw_properties_or_hash();
    if (!properties_or_hash->IsSmi()) {
      os << Brief(properties_or_hash);
    }
    os << " {";
    if (obj->PrintProperties(os)) os << "\n ";
    os << "}\n";
    if (print_elements && obj->elements()->length() > 0) {
      obj->PrintElements(os);
    }
    int embedder_fields = obj->GetEmbedderFieldCount();
    if (embedder_fields > 0) {
      os << " - embedder fields = {";
      for (int i = 0; i < embedder_fields; i++) {
        os << "\n    ";
        PrintEmbedderData(os, EmbedderDataSlot(obj, i));
      }
      os << "\n }\n";
    }
  }
  
  void JSObject::JSObjectPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, nullptr);
    JSObjectPrintBody(os, this);
  }
  
  void JSGeneratorObject::JSGeneratorObjectPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSGeneratorObject");
    os << "\n - function: " << Brief(function());
    os << "\n - context: " << Brief(context());
    os << "\n - receiver: " << Brief(receiver());
    if (is_executing() || is_closed()) {
      os << "\n - input: " << Brief(input_or_debug_pos());
    } else {
      DCHECK(is_suspended());
      os << "\n - debug pos: " << Brief(input_or_debug_pos());
    }
    const char* mode = "(invalid)";
    switch (resume_mode()) {
      case kNext:
        mode = ".next()";
        break;
      case kReturn:
        mode = ".return()";
        break;
      case kThrow:
        mode = ".throw()";
        break;
    }
    os << "\n - resume mode: " << mode;
    os << "\n - continuation: " << continuation();
    if (is_closed()) os << " (closed)";
    if (is_executing()) os << " (executing)";
    if (is_suspended()) os << " (suspended)";
    if (is_suspended()) {
      DisallowHeapAllocation no_gc;
      SharedFunctionInfo* fun_info = function()->shared();
      if (fun_info->HasSourceCode()) {
        Script* script = Script::cast(fun_info->script());
        int lin = script->GetLineNumber(source_position()) + 1;
        int col = script->GetColumnNumber(source_position()) + 1;
        String script_name = script->name()->IsString()
                                 ? String::cast(script->name())
                                 : GetReadOnlyRoots().empty_string();
        os << "\n - source position: " << source_position();
        os << " (";
        script_name->PrintUC16(os);
        os << ", lin " << lin;
        os << ", col " << col;
        os << ")";
      }
    }
    os << "\n - register file: " << Brief(parameters_and_registers());
    JSObjectPrintBody(os, this);
  }
  
  void JSArray::JSArrayPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSArray");
    os << "\n - length: " << Brief(this->length());
    JSObjectPrintBody(os, this);
  }
  
  void JSPromise::JSPromisePrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSPromise");
    os << "\n - status: " << JSPromise::Status(status());
    if (status() == Promise::kPending) {
      os << "\n - reactions: " << Brief(reactions());
    } else {
      os << "\n - result: " << Brief(result());
    }
    os << "\n - has_handler: " << has_handler();
    JSObjectPrintBody(os, this);
  }
  
  void JSRegExp::JSRegExpPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSRegExp");
    os << "\n - data: " << Brief(data());
    os << "\n - source: " << Brief(source());
    JSObjectPrintBody(os, this);
  }
  
  void JSRegExpStringIterator::JSRegExpStringIteratorPrint(
      std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSRegExpStringIterator");
    os << "\n - regex: " << Brief(iterating_regexp());
    os << "\n - string: " << Brief(iterating_string());
    os << "\n - done: " << done();
    os << "\n - global: " << global();
    os << "\n - unicode: " << unicode();
    JSObjectPrintBody(os, this);
  }
  
  void Symbol::SymbolPrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "Symbol");
    os << "\n - hash: " << Hash();
    os << "\n - name: " << Brief(name());
    if (name()->IsUndefined()) {
      os << " (" << PrivateSymbolToName() << ")";
    }
    os << "\n - private: " << is_private();
  }
  
  void Map::MapPrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "Map");
    os << "\n - type: " << instance_type();
    os << "\n - instance size: ";
    if (instance_size() == kVariableSizeSentinel) {
      os << "variable";
    } else {
      os << instance_size();
    }
    if (IsJSObjectMap()) {
      os << "\n - inobject properties: " << GetInObjectProperties();
    }
    os << "\n - elements kind: " << ElementsKindToString(elements_kind());
    os << "\n - unused property fields: " << UnusedPropertyFields();
    os << "\n - enum length: ";
    if (EnumLength() == kInvalidEnumCacheSentinel) {
      os << "invalid";
    } else {
      os << EnumLength();
    }
    if (is_deprecated()) os << "\n - deprecated_map";
    if (is_stable()) os << "\n - stable_map";
    if (is_migration_target()) os << "\n - migration_target";
    if (is_dictionary_map()) os << "\n - dictionary_map";
    if (has_hidden_prototype()) os << "\n - has_hidden_prototype";
    if (has_named_interceptor()) os << "\n - named_interceptor";
    if (has_indexed_interceptor()) os << "\n - indexed_interceptor";
    if (may_have_interesting_symbols()) os << "\n - may_have_interesting_symbols";
    if (is_undetectable()) os << "\n - undetectable";
    if (is_callable()) os << "\n - callable";
    if (is_constructor()) os << "\n - constructor";
    if (has_prototype_slot()) {
      os << "\n - has_prototype_slot";
      if (has_non_instance_prototype()) os << " (non-instance prototype)";
    }
    if (is_access_check_needed()) os << "\n - access_check_needed";
    if (!is_extensible()) os << "\n - non-extensible";
    if (is_prototype_map()) {
      os << "\n - prototype_map";
      os << "\n - prototype info: " << Brief(prototype_info());
    } else {
      os << "\n - back pointer: " << Brief(GetBackPointer());
    }
    os << "\n - prototype_validity cell: " << Brief(prototype_validity_cell());
    os << "\n - instance descriptors " << (owns_descriptors() ? "(own) " : "")
       << "#" << NumberOfOwnDescriptors() << ": "
       << Brief(instance_descriptors());
    if (FLAG_unbox_double_fields) {
      os << "\n - layout descriptor: ";
      layout_descriptor()->ShortPrint(os);
    }
  
    Isolate* isolate;
    // Read-only maps can't have transitions, which is fortunate because we need
    // the isolate to iterate over the transitions.
    if (Isolate::FromWritableHeapObject(reinterpret_cast<HeapObject*>(ptr()),
                                        &isolate)) {
      DisallowHeapAllocation no_gc;
      TransitionsAccessor transitions(isolate, *this, &no_gc);
      int nof_transitions = transitions.NumberOfTransitions();
      if (nof_transitions > 0) {
        os << "\n - transitions #" << nof_transitions << ": ";
        HeapObject* heap_object;
        Smi smi;
        if (raw_transitions()->ToSmi(&smi)) {
          os << Brief(smi);
        } else if (raw_transitions()->GetHeapObject(&heap_object)) {
          os << Brief(heap_object);
        }
        transitions.PrintTransitions(os);
      }
    }
    os << "\n - prototype: " << Brief(prototype());
    os << "\n - constructor: " << Brief(GetConstructor());
    os << "\n - dependent code: " << Brief(dependent_code());
    os << "\n - construction counter: " << construction_counter();
    os << "\n";
  }
  
  void DescriptorArray::DescriptorArrayPrint(std::ostream& os) {
    HeapObject::PrintHeader(os, "DescriptorArray");
    os << "\n - enum_cache: ";
    if (enum_cache()->keys()->length() == 0) {
      os << "empty";
    } else {
      os << enum_cache()->keys()->length();
      os << "\n   - keys: " << Brief(enum_cache()->keys());
      os << "\n   - indices: " << Brief(enum_cache()->indices());
    }
    os << "\n - nof slack descriptors: " << number_of_slack_descriptors();
    os << "\n - nof descriptors: " << number_of_descriptors();
    PrintDescriptors(os);
  }
  
  void AliasedArgumentsEntry::AliasedArgumentsEntryPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AliasedArgumentsEntry");
    os << "\n - aliased_context_slot: " << aliased_context_slot();
  }
  
  namespace {
  void PrintFixedArrayWithHeader(std::ostream& os, FixedArray array,
                                 const char* type) {
    array->PrintHeader(os, type);
    os << "\n - length: " << array->length();
    PrintFixedArrayElements(os, array);
    os << "\n";
  }
  
  template <typename T>
  void PrintHashTableWithHeader(std::ostream& os, T table, const char* type) {
    table->PrintHeader(os, type);
    os << "\n - length: " << table->length();
    os << "\n - elements: " << table->NumberOfElements();
    os << "\n - deleted: " << table->NumberOfDeletedElements();
    os << "\n - capacity: " << table->Capacity();
  
    os << "\n - elements: {";
    for (int i = 0; i < table->Capacity(); i++) {
      os << '\n'
         << std::setw(12) << i << ": " << Brief(table->KeyAt(i)) << " -> "
         << Brief(table->ValueAt(i));
    }
    os << "\n }\n";
  }
  
  template <typename T>
  void PrintWeakArrayElements(std::ostream& os, T* array) {
    // Print in array notation for non-sparse arrays.
    MaybeObject previous_value =
        array->length() > 0 ? array->Get(0) : MaybeObject(kNullAddress);
    MaybeObject value;
    int previous_index = 0;
    int i;
    for (i = 1; i <= array->length(); i++) {
      if (i < array->length()) value = array->Get(i);
      if (previous_value == value && i != array->length()) {
        continue;
      }
      os << "\n";
      std::stringstream ss;
      ss << previous_index;
      if (previous_index != i - 1) {
        ss << '-' << (i - 1);
      }
      os << std::setw(12) << ss.str() << ": " << Brief(previous_value);
      previous_index = i;
      previous_value = value;
    }
  }
  
  }  // namespace
  
  void EmbedderDataArray::EmbedderDataArrayPrint(std::ostream& os) {
    PrintHeader(os, "EmbedderDataArray");
    os << "\n - length: " << length();
    EmbedderDataSlot start(*this, 0);
    EmbedderDataSlot end(*this, length());
    for (EmbedderDataSlot slot = start; slot < end; ++slot) {
      os << "\n    ";
      PrintEmbedderData(os, slot);
    }
    os << "\n";
  }
  
  void FixedArray::FixedArrayPrint(std::ostream& os) {
    PrintFixedArrayWithHeader(os, *this, "FixedArray");
  }
  
  namespace {
  void PrintContextWithHeader(std::ostream& os, Context context,
                              const char* type) {
    context->PrintHeader(os, type);
    os << "\n - length: " << context->length();
    os << "\n - scope_info: " << Brief(context->scope_info());
    os << "\n - previous: " << Brief(context->previous());
    os << "\n - extension_object: " << Brief(context->extension_object());
    os << "\n - native_context: " << Brief(context->native_context());
    PrintFixedArrayElements(os, context);
    os << "\n";
  }
  }  // namespace
  
  void Context::ContextPrint(std::ostream& os) {
    PrintContextWithHeader(os, *this, "Context");
  }
  
  void NativeContext::NativeContextPrint(std::ostream& os) {
    PrintContextWithHeader(os, *this, "NativeContext");
    os << " - microtask_queue: " << microtask_queue() << "\n";
  }
  
  void ObjectHashTable::ObjectHashTablePrint(std::ostream& os) {
    PrintHashTableWithHeader(os, *this, "ObjectHashTable");
  }
  
  void NumberDictionary::NumberDictionaryPrint(std::ostream& os) {
    PrintHashTableWithHeader(os, *this, "NumberDictionary");
  }
  
  void EphemeronHashTable::EphemeronHashTablePrint(std::ostream& os) {
    PrintHashTableWithHeader(os, *this, "EphemeronHashTable");
  }
  
  void ObjectBoilerplateDescription::ObjectBoilerplateDescriptionPrint(
      std::ostream& os) {
    PrintFixedArrayWithHeader(os, *this, "ObjectBoilerplateDescription");
  }
  
  void PropertyArray::PropertyArrayPrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "PropertyArray");
    os << "\n - length: " << length();
    os << "\n - hash: " << Hash();
    PrintFixedArrayElements(os, *this);
    os << "\n";
  }
  
  void FixedDoubleArray::FixedDoubleArrayPrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "FixedDoubleArray");
    os << "\n - length: " << length();
    DoPrintElements<FixedDoubleArray>(os, *this);
    os << "\n";
  }
  
  void WeakFixedArray::WeakFixedArrayPrint(std::ostream& os) {
    PrintHeader(os, "WeakFixedArray");
    os << "\n - length: " << length() << "\n";
    PrintWeakArrayElements(os, this);
    os << "\n";
  }
  
  void WeakArrayList::WeakArrayListPrint(std::ostream& os) {
    PrintHeader(os, "WeakArrayList");
    os << "\n - capacity: " << capacity();
    os << "\n - length: " << length() << "\n";
    PrintWeakArrayElements(os, this);
    os << "\n";
  }
  
  void TransitionArray::TransitionArrayPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "TransitionArray");
    PrintInternal(os);
  }
  
  void FeedbackCell::FeedbackCellPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "FeedbackCell");
    ReadOnlyRoots roots = GetReadOnlyRoots();
    if (map() == roots.no_closures_cell_map()) {
      os << "\n - no closures";
    } else if (map() == roots.one_closure_cell_map()) {
      os << "\n - one closure";
    } else if (map() == roots.many_closures_cell_map()) {
      os << "\n - many closures";
    } else {
      os << "\n - Invalid FeedbackCell map";
    }
    os << " - value: " << Brief(value());
    os << "\n";
  }
  
  void FeedbackVectorSpec::Print() {
    StdoutStream os;
  
    FeedbackVectorSpecPrint(os);
  
    os << std::flush;
  }
  
  void FeedbackVectorSpec::FeedbackVectorSpecPrint(std::ostream& os) {  // NOLINT
    int slot_count = slots();
    os << " - slot_count: " << slot_count;
    if (slot_count == 0) {
      os << " (empty)\n";
      return;
    }
  
    for (int slot = 0; slot < slot_count;) {
      FeedbackSlotKind kind = GetKind(FeedbackSlot(slot));
      int entry_size = FeedbackMetadata::GetSlotSize(kind);
      DCHECK_LT(0, entry_size);
      os << "\n Slot #" << slot << " " << kind;
      slot += entry_size;
    }
    os << "\n";
  }
  
  void FeedbackMetadata::FeedbackMetadataPrint(std::ostream& os) {
    HeapObject::PrintHeader(os, "FeedbackMetadata");
    os << "\n - slot_count: " << slot_count();
  
    FeedbackMetadataIterator iter(this);
    while (iter.HasNext()) {
      FeedbackSlot slot = iter.Next();
      FeedbackSlotKind kind = iter.kind();
      os << "\n Slot " << slot << " " << kind;
    }
    os << "\n";
  }
  
  void FeedbackVector::FeedbackVectorPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "FeedbackVector");
    os << "\n - length: " << length();
    if (length() == 0) {
      os << " (empty)\n";
      return;
    }
  
    os << "\n - shared function info: " << Brief(shared_function_info());
    os << "\n - optimized code/marker: ";
    if (has_optimized_code()) {
      os << Brief(optimized_code());
    } else {
      os << optimization_marker();
    }
    os << "\n - invocation count: " << invocation_count();
    os << "\n - profiler ticks: " << profiler_ticks();
  
    FeedbackMetadataIterator iter(metadata());
    while (iter.HasNext()) {
      FeedbackSlot slot = iter.Next();
      FeedbackSlotKind kind = iter.kind();
  
      os << "\n - slot " << slot << " " << kind << " ";
      FeedbackSlotPrint(os, slot);
  
      int entry_size = iter.entry_size();
      if (entry_size > 0) os << " {";
      for (int i = 0; i < entry_size; i++) {
        int index = GetIndex(slot) + i;
        os << "\n     [" << index << "]: " << Brief(get(index));
      }
      if (entry_size > 0) os << "\n  }";
    }
    os << "\n";
  }
  
  void FeedbackVector::FeedbackSlotPrint(std::ostream& os,
                                         FeedbackSlot slot) {  // NOLINT
    FeedbackNexus nexus(this, slot);
    nexus.Print(os);
  }
  
  void FeedbackNexus::Print(std::ostream& os) {  // NOLINT
    switch (kind()) {
      case FeedbackSlotKind::kCall:
      case FeedbackSlotKind::kLoadProperty:
      case FeedbackSlotKind::kLoadKeyed:
      case FeedbackSlotKind::kLoadGlobalInsideTypeof:
      case FeedbackSlotKind::kLoadGlobalNotInsideTypeof:
      case FeedbackSlotKind::kStoreNamedSloppy:
      case FeedbackSlotKind::kStoreNamedStrict:
      case FeedbackSlotKind::kStoreOwnNamed:
      case FeedbackSlotKind::kStoreGlobalSloppy:
      case FeedbackSlotKind::kStoreGlobalStrict:
      case FeedbackSlotKind::kStoreKeyedSloppy:
      case FeedbackSlotKind::kInstanceOf:
      case FeedbackSlotKind::kStoreDataPropertyInLiteral:
      case FeedbackSlotKind::kStoreKeyedStrict:
      case FeedbackSlotKind::kStoreInArrayLiteral:
      case FeedbackSlotKind::kCloneObject: {
        os << InlineCacheState2String(StateFromFeedback());
        break;
      }
      case FeedbackSlotKind::kBinaryOp: {
        os << "BinaryOp:" << GetBinaryOperationFeedback();
        break;
      }
      case FeedbackSlotKind::kCompareOp: {
        os << "CompareOp:" << GetCompareOperationFeedback();
        break;
      }
      case FeedbackSlotKind::kForIn: {
        os << "ForIn:" << GetForInFeedback();
        break;
      }
      case FeedbackSlotKind::kCreateClosure:
      case FeedbackSlotKind::kLiteral:
      case FeedbackSlotKind::kTypeProfile:
        break;
      case FeedbackSlotKind::kInvalid:
      case FeedbackSlotKind::kKindsNumber:
        UNREACHABLE();
        break;
    }
  }
  
  void JSValue::JSValuePrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSValue");
    os << "\n - value: " << Brief(value());
    JSObjectPrintBody(os, this);
  }
  
  void JSMessageObject::JSMessageObjectPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSMessageObject");
    os << "\n - type: " << static_cast<int>(type());
    os << "\n - arguments: " << Brief(argument());
    os << "\n - start_position: " << start_position();
    os << "\n - end_position: " << end_position();
    os << "\n - script: " << Brief(script());
    os << "\n - stack_frames: " << Brief(stack_frames());
    JSObjectPrintBody(os, this);
  }
  
  
  void String::StringPrint(std::ostream& os) {  // NOLINT
    if (!HasOnlyOneByteChars()) {
      os << "u";
    }
    if (StringShape(*this).IsInternalized()) {
      os << "#";
    } else if (StringShape(*this).IsCons()) {
      os << "c\"";
    } else if (StringShape(*this).IsThin()) {
      os << ">\"";
    } else {
      os << "\"";
    }
  
    const char truncated_epilogue[] = "...<truncated>";
    int len = length();
    if (!FLAG_use_verbose_printer) {
      if (len > 100) {
        len = 100 - sizeof(truncated_epilogue);
      }
    }
    for (int i = 0; i < len; i++) {
      os << AsUC16(Get(i));
    }
    if (len != length()) {
      os << truncated_epilogue;
    }
  
    if (!StringShape(*this).IsInternalized()) os << "\"";
  }
  
  
  void Name::NamePrint(std::ostream& os) {  // NOLINT
    if (IsString()) {
      String::cast(*this)->StringPrint(os);
    } else {
      os << Brief(*this);
    }
  }
  
  
  static const char* const weekdays[] = {
    "???", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  };
  
  void JSDate::JSDatePrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSDate");
    os << "\n - value: " << Brief(value());
    if (!year()->IsSmi()) {
      os << "\n - time = NaN\n";
    } else {
      // TODO(svenpanne) Add some basic formatting to our streams.
      ScopedVector<char> buf(100);
      SNPrintF(buf, "\n - time = %s %04d/%02d/%02d %02d:%02d:%02d\n",
               weekdays[weekday()->IsSmi() ? Smi::ToInt(weekday()) + 1 : 0],
               year()->IsSmi() ? Smi::ToInt(year()) : -1,
               month()->IsSmi() ? Smi::ToInt(month()) : -1,
               day()->IsSmi() ? Smi::ToInt(day()) : -1,
               hour()->IsSmi() ? Smi::ToInt(hour()) : -1,
               min()->IsSmi() ? Smi::ToInt(min()) : -1,
               sec()->IsSmi() ? Smi::ToInt(sec()) : -1);
      os << buf.start();
    }
    JSObjectPrintBody(os, this);
  }
  
  
  void JSProxy::JSProxyPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "JSProxy");
    os << "\n - target: ";
    target()->ShortPrint(os);
    os << "\n - handler: ";
    handler()->ShortPrint(os);
    os << "\n";
  }
  
  void JSSet::JSSetPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSSet");
    os << " - table: " << Brief(table());
    JSObjectPrintBody(os, this);
  }
  
  void JSMap::JSMapPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSMap");
    os << " - table: " << Brief(table());
    JSObjectPrintBody(os, this);
  }
  
  void JSCollectionIterator::JSCollectionIteratorPrint(
      std::ostream& os, const char* name) {  // NOLINT
    JSObjectPrintHeader(os, this, name);
    os << "\n - table: " << Brief(table());
    os << "\n - index: " << Brief(index());
    JSObjectPrintBody(os, this);
  }
  
  void JSSetIterator::JSSetIteratorPrint(std::ostream& os) {  // NOLINT
    JSCollectionIteratorPrint(os, "JSSetIterator");
  }
  
  void JSMapIterator::JSMapIteratorPrint(std::ostream& os) {  // NOLINT
    JSCollectionIteratorPrint(os, "JSMapIterator");
  }
  
  void JSWeakCell::JSWeakCellPrint(std::ostream& os) {
    JSObjectPrintHeader(os, this, "JSWeakCell");
    os << "\n - factory: " << Brief(factory());
    os << "\n - target: " << Brief(target());
    os << "\n - holdings: " << Brief(holdings());
    os << "\n - prev: " << Brief(prev());
    os << "\n - next: " << Brief(next());
    JSObjectPrintBody(os, this);
  }
  
  void JSWeakFactory::JSWeakFactoryPrint(std::ostream& os) {
    JSObjectPrintHeader(os, this, "JSWeakFactory");
    os << "\n - native_context: " << Brief(native_context());
    os << "\n - cleanup: " << Brief(cleanup());
    os << "\n - active_cells: " << Brief(active_cells());
    os << "\n - cleared_cells: " << Brief(cleared_cells());
    JSObjectPrintBody(os, this);
  }
  
  void JSWeakFactoryCleanupIterator::JSWeakFactoryCleanupIteratorPrint(
      std::ostream& os) {
    JSObjectPrintHeader(os, this, "JSWeakFactoryCleanupIterator");
    os << "\n - factory: " << Brief(factory());
    JSObjectPrintBody(os, this);
  }
  
  void WeakFactoryCleanupJobTask::WeakFactoryCleanupJobTaskPrint(
      std::ostream& os) {
    HeapObject::PrintHeader(os, "WeakFactoryCleanupJobTask");
    os << "\n - factory: " << Brief(factory());
  }
  
  void JSWeakMap::JSWeakMapPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSWeakMap");
    os << "\n - table: " << Brief(table());
    JSObjectPrintBody(os, this);
  }
  
  void JSWeakSet::JSWeakSetPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSWeakSet");
    os << "\n - table: " << Brief(table());
    JSObjectPrintBody(os, this);
  }
  
  void JSArrayBuffer::JSArrayBufferPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSArrayBuffer");
    os << "\n - backing_store: " << backing_store();
    os << "\n - byte_length: " << byte_length();
    if (is_external()) os << "\n - external";
    if (is_neuterable()) os << "\n - neuterable";
    if (was_neutered()) os << "\n - neutered";
    if (is_shared()) os << "\n - shared";
    if (is_wasm_memory()) os << "\n - is_wasm_memory";
    if (is_growable()) os << "\n - growable";
    JSObjectPrintBody(os, this, !was_neutered());
  }
  
  void JSTypedArray::JSTypedArrayPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSTypedArray");
    os << "\n - buffer: " << Brief(buffer());
    os << "\n - byte_offset: " << byte_offset();
    os << "\n - byte_length: " << byte_length();
    os << "\n - length: " << Brief(length());
    if (WasNeutered()) os << "\n - neutered";
    JSObjectPrintBody(os, this, !WasNeutered());
  }
  
  void JSArrayIterator::JSArrayIteratorPrint(std::ostream& os) {  // NOLING
    JSObjectPrintHeader(os, this, "JSArrayIterator");
    os << "\n - iterated_object: " << Brief(iterated_object());
    os << "\n - next_index: " << Brief(next_index());
    os << "\n - kind: " << kind();
    JSObjectPrintBody(os, this);
  }
  
  void JSDataView::JSDataViewPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSDataView");
    os << "\n - buffer =" << Brief(buffer());
    os << "\n - byte_offset: " << byte_offset();
    os << "\n - byte_length: " << byte_length();
    if (WasNeutered()) os << "\n - neutered";
    JSObjectPrintBody(os, this, !WasNeutered());
  }
  
  void JSBoundFunction::JSBoundFunctionPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSBoundFunction");
    os << "\n - bound_target_function: " << Brief(bound_target_function());
    os << "\n - bound_this: " << Brief(bound_this());
    os << "\n - bound_arguments: " << Brief(bound_arguments());
    JSObjectPrintBody(os, this);
  }
  
  void JSFunction::JSFunctionPrint(std::ostream& os) {  // NOLINT
    Isolate* isolate = GetIsolate();
    JSObjectPrintHeader(os, this, "Function");
    os << "\n - function prototype: ";
    if (has_prototype_slot()) {
      if (has_prototype()) {
        os << Brief(prototype());
        if (map()->has_non_instance_prototype()) {
          os << " (non-instance prototype)";
        }
      }
      os << "\n - initial_map: ";
      if (has_initial_map()) os << Brief(initial_map());
    } else {
      os << "<no-prototype-slot>";
    }
    os << "\n - shared_info: " << Brief(shared());
    os << "\n - name: " << Brief(shared()->Name());
  
    // Print Builtin name for builtin functions
    int builtin_index = code()->builtin_index();
    if (Builtins::IsBuiltinId(builtin_index) && !IsInterpreted()) {
      os << "\n - builtin: " << isolate->builtins()->name(builtin_index);
    }
  
    os << "\n - formal_parameter_count: "
       << shared()->internal_formal_parameter_count();
    os << "\n - kind: " << shared()->kind();
    os << "\n - context: " << Brief(context());
    os << "\n - code: " << Brief(code());
    if (IsInterpreted()) {
      os << "\n - interpreted";
      if (shared()->HasBytecodeArray()) {
        os << "\n - bytecode: " << shared()->GetBytecodeArray();
      }
    }
    if (WasmExportedFunction::IsWasmExportedFunction(this)) {
      WasmExportedFunction* function = WasmExportedFunction::cast(this);
      os << "\n - WASM instance "
         << reinterpret_cast<void*>(function->instance());
      os << "\n - WASM function index " << function->function_index();
    }
    shared()->PrintSourceCode(os);
    JSObjectPrintBody(os, this);
    os << "\n - feedback vector: ";
    if (!shared()->HasFeedbackMetadata()) {
      os << "feedback metadata is not available in SFI\n";
    } else if (has_feedback_vector()) {
      feedback_vector()->FeedbackVectorPrint(os);
    } else {
      os << "not available\n";
    }
  }
  
  void SharedFunctionInfo::PrintSourceCode(std::ostream& os) {
    if (HasSourceCode()) {
      os << "\n - source code: ";
      String source = String::cast(Script::cast(script())->source());
      int start = StartPosition();
      int length = EndPosition() - start;
      std::unique_ptr<char[]> source_string = source->ToCString(
          DISALLOW_NULLS, FAST_STRING_TRAVERSAL, start, length, nullptr);
      os << source_string.get();
    }
  }
  
  void SharedFunctionInfo::SharedFunctionInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "SharedFunctionInfo");
    os << "\n - name: ";
    if (HasSharedName()) {
      os << Brief(Name());
    } else {
      os << "<no-shared-name>";
    }
    if (HasInferredName()) {
      os << "\n - inferred name: " << Brief(inferred_name());
    }
    os << "\n - kind: " << kind();
    if (needs_home_object()) {
      os << "\n - needs_home_object";
    }
    os << "\n - function_map_index: " << function_map_index();
    os << "\n - formal_parameter_count: " << internal_formal_parameter_count();
    os << "\n - expected_nof_properties: " << expected_nof_properties();
    os << "\n - language_mode: " << language_mode();
    os << "\n - data: " << Brief(function_data());
    os << "\n - code (from data): " << Brief(GetCode());
    PrintSourceCode(os);
    // Script files are often large, hard to read.
    // os << "\n - script =";
    // script()->Print(os);
    if (is_named_expression()) {
      os << "\n - named expression";
    } else if (is_anonymous_expression()) {
      os << "\n - anonymous expression";
    } else if (is_declaration()) {
      os << "\n - declaration";
    }
    os << "\n - function token position: " << function_token_position();
    os << "\n - start position: " << StartPosition();
    os << "\n - end position: " << EndPosition();
    if (HasDebugInfo()) {
      os << "\n - debug info: " << Brief(GetDebugInfo());
    } else {
      os << "\n - no debug info";
    }
    os << "\n - scope info: " << Brief(scope_info());
    if (HasOuterScopeInfo()) {
      os << "\n - outer scope info: " << Brief(GetOuterScopeInfo());
    }
    os << "\n - length: " << length();
    os << "\n - feedback_metadata: ";
    if (HasFeedbackMetadata()) {
      feedback_metadata()->FeedbackMetadataPrint(os);
    } else {
      os << "<none>";
    }
    os << "\n";
  }
  
  void JSGlobalProxy::JSGlobalProxyPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSGlobalProxy");
    if (!GetIsolate()->bootstrapper()->IsActive()) {
      os << "\n - native context: " << Brief(native_context());
    }
    JSObjectPrintBody(os, this);
  }
  
  void JSGlobalObject::JSGlobalObjectPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSGlobalObject");
    if (!GetIsolate()->bootstrapper()->IsActive()) {
      os << "\n - native context: " << Brief(native_context());
    }
    os << "\n - global proxy: " << Brief(global_proxy());
    JSObjectPrintBody(os, this);
  }
  
  void Cell::CellPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "Cell");
    os << "\n - value: " << Brief(value());
    os << "\n";
  }
  
  void PropertyCell::PropertyCellPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PropertyCell");
    os << "\n - name: ";
    name()->NamePrint(os);
    os << "\n - value: " << Brief(value());
    os << "\n - details: ";
    property_details().PrintAsSlowTo(os);
    PropertyCellType cell_type = property_details().cell_type();
    os << "\n - cell_type: ";
    if (value()->IsTheHole()) {
      switch (cell_type) {
        case PropertyCellType::kUninitialized:
          os << "Uninitialized";
          break;
        case PropertyCellType::kInvalidated:
          os << "Invalidated";
          break;
        default:
          os << "??? " << static_cast<int>(cell_type);
          break;
      }
    } else {
      switch (cell_type) {
        case PropertyCellType::kUndefined:
          os << "Undefined";
          break;
        case PropertyCellType::kConstant:
          os << "Constant";
          break;
        case PropertyCellType::kConstantType:
          os << "ConstantType"
             << " (";
          switch (GetConstantType()) {
            case PropertyCellConstantType::kSmi:
              os << "Smi";
              break;
            case PropertyCellConstantType::kStableMap:
              os << "StableMap";
              break;
          }
          os << ")";
          break;
        case PropertyCellType::kMutable:
          os << "Mutable";
          break;
      }
    }
    os << "\n";
  }
  
  void Code::CodePrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "Code");
    os << "\n";
  #ifdef ENABLE_DISASSEMBLER
    if (FLAG_use_verbose_printer) {
      Disassemble(nullptr, os);
    }
  #endif
  }
  
  void CodeDataContainer::CodeDataContainerPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "CodeDataContainer");
    os << "\n - kind_specific_flags: " << kind_specific_flags();
    os << "\n";
  }
  
  void Foreign::ForeignPrint(std::ostream& os) {  // NOLINT
    os << "foreign address : " << reinterpret_cast<void*>(foreign_address());
    os << "\n";
  }
  
  
  void AccessorInfo::AccessorInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AccessorInfo");
    os << "\n - name: " << Brief(name());
    os << "\n - flags: " << flags();
    os << "\n - getter: " << Brief(getter());
    os << "\n - setter: " << Brief(setter());
    os << "\n - js_getter: " << Brief(js_getter());
    os << "\n - data: " << Brief(data());
    os << "\n";
  }
  
  void CallbackTask::CallbackTaskPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "CallbackTask");
    os << "\n - callback: " << Brief(callback());
    os << "\n - data: " << Brief(data());
    os << "\n";
  }
  
  void CallableTask::CallableTaskPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "CallableTask");
    os << "\n - context: " << Brief(context());
    os << "\n - callable: " << Brief(callable());
    os << "\n";
  }
  
  void PromiseFulfillReactionJobTask::PromiseFulfillReactionJobTaskPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PromiseFulfillReactionJobTask");
    os << "\n - argument: " << Brief(argument());
    os << "\n - context: " << Brief(context());
    os << "\n - handler: " << Brief(handler());
    os << "\n - promise_or_capability: " << Brief(promise_or_capability());
    os << "\n";
  }
  
  void PromiseRejectReactionJobTask::PromiseRejectReactionJobTaskPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PromiseRejectReactionJobTask");
    os << "\n - argument: " << Brief(argument());
    os << "\n - context: " << Brief(context());
    os << "\n - handler: " << Brief(handler());
    os << "\n - promise_or_capability: " << Brief(promise_or_capability());
    os << "\n";
  }
  
  void PromiseResolveThenableJobTask::PromiseResolveThenableJobTaskPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PromiseResolveThenableJobTask");
    os << "\n - context: " << Brief(context());
    os << "\n - promise_to_resolve: " << Brief(promise_to_resolve());
    os << "\n - then: " << Brief(then());
    os << "\n - thenable: " << Brief(thenable());
    os << "\n";
  }
  
  void PromiseCapability::PromiseCapabilityPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PromiseCapability");
    os << "\n - promise: " << Brief(promise());
    os << "\n - resolve: " << Brief(resolve());
    os << "\n - reject: " << Brief(reject());
    os << "\n";
  }
  
  void PromiseReaction::PromiseReactionPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PromiseReaction");
    os << "\n - next: " << Brief(next());
    os << "\n - reject_handler: " << Brief(reject_handler());
    os << "\n - fulfill_handler: " << Brief(fulfill_handler());
    os << "\n - promise_or_capability: " << Brief(promise_or_capability());
    os << "\n";
  }
  
  void AsyncGeneratorRequest::AsyncGeneratorRequestPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AsyncGeneratorRequest");
    const char* mode = "Invalid!";
    switch (resume_mode()) {
      case JSGeneratorObject::kNext:
        mode = ".next()";
        break;
      case JSGeneratorObject::kReturn:
        mode = ".return()";
        break;
      case JSGeneratorObject::kThrow:
        mode = ".throw()";
        break;
    }
    os << "\n - resume mode: " << mode;
    os << "\n - value: " << Brief(value());
    os << "\n - next: " << Brief(next());
    os << "\n";
  }
  
  void ModuleInfoEntry::ModuleInfoEntryPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "ModuleInfoEntry");
    os << "\n - export_name: " << Brief(export_name());
    os << "\n - local_name: " << Brief(local_name());
    os << "\n - import_name: " << Brief(import_name());
    os << "\n - module_request: " << module_request();
    os << "\n - cell_index: " << cell_index();
    os << "\n - beg_pos: " << beg_pos();
    os << "\n - end_pos: " << end_pos();
    os << "\n";
  }
  
  void Module::ModulePrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "Module");
    os << "\n - origin: " << Brief(script()->GetNameOrSourceURL());
    os << "\n - code: " << Brief(code());
    os << "\n - exports: " << Brief(exports());
    os << "\n - requested_modules: " << Brief(requested_modules());
    os << "\n - script: " << Brief(script());
    os << "\n - import_meta: " << Brief(import_meta());
    os << "\n - status: " << status();
    os << "\n - exception: " << Brief(exception());
    os << "\n";
  }
  
  void JSModuleNamespace::JSModuleNamespacePrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSModuleNamespace");
    os << "\n - module: " << Brief(module());
    JSObjectPrintBody(os, this);
  }
  
  void PrototypeInfo::PrototypeInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PrototypeInfo");
    os << "\n - module namespace: " << Brief(module_namespace());
    os << "\n - prototype users: " << Brief(prototype_users());
    os << "\n - registry slot: " << registry_slot();
    os << "\n - object create map: " << Brief(object_create_map());
    os << "\n - should_be_fast_map: " << should_be_fast_map();
    os << "\n";
  }
  
  void Tuple2::Tuple2Print(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "Tuple2");
    os << "\n - value1: " << Brief(value1());
    os << "\n - value2: " << Brief(value2());
    os << "\n";
  }
  
  void Tuple3::Tuple3Print(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "Tuple3");
    os << "\n - value1: " << Brief(value1());
    os << "\n - value2: " << Brief(value2());
    os << "\n - value3: " << Brief(value3());
    os << "\n";
  }
  
  void ArrayBoilerplateDescription::ArrayBoilerplateDescriptionPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "ArrayBoilerplateDescription");
    os << "\n - elements kind: " << elements_kind();
    os << "\n - constant elements: " << Brief(constant_elements());
    os << "\n";
  }
  
  void AsmWasmData::AsmWasmDataPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AsmWasmData");
    os << "\n - native module: " << Brief(managed_native_module());
    os << "\n - export_wrappers: " << Brief(export_wrappers());
    os << "\n - offset table: " << Brief(asm_js_offset_table());
    os << "\n - uses bitset: " << uses_bitset()->value();
    os << "\n";
  }
  
  void WasmDebugInfo::WasmDebugInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "WasmDebugInfo");
    os << "\n - wasm_instance: " << Brief(wasm_instance());
    os << "\n";
  }
  
  void WasmInstanceObject::WasmInstanceObjectPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "WasmInstanceObject");
    os << "\n - module_object: " << Brief(module_object());
    os << "\n - exports_object: " << Brief(exports_object());
    os << "\n - native_context: " << Brief(native_context());
    if (has_memory_object()) {
      os << "\n - memory_object: " << Brief(memory_object());
    }
    if (has_globals_buffer()) {
      os << "\n - globals_buffer: " << Brief(globals_buffer());
    }
    if (has_imported_mutable_globals_buffers()) {
      os << "\n - imported_mutable_globals_buffers: "
         << Brief(imported_mutable_globals_buffers());
    }
    if (has_debug_info()) {
      os << "\n - debug_info: " << Brief(debug_info());
    }
    if (has_table_object()) {
      os << "\n - table_object: " << Brief(table_object());
    }
    os << "\n - imported_function_refs: " << Brief(imported_function_refs());
    if (has_indirect_function_table_refs()) {
      os << "\n - indirect_function_table_refs: "
         << Brief(indirect_function_table_refs());
    }
    if (has_managed_native_allocations()) {
      os << "\n - managed_native_allocations: "
         << Brief(managed_native_allocations());
    }
    os << "\n - memory_start: " << static_cast<void*>(memory_start());
    os << "\n - memory_size: " << memory_size();
    os << "\n - memory_mask: " << AsHex(memory_mask());
    os << "\n - imported_function_targets: "
       << static_cast<void*>(imported_function_targets());
    os << "\n - globals_start: " << static_cast<void*>(globals_start());
    os << "\n - imported_mutable_globals: "
       << static_cast<void*>(imported_mutable_globals());
    os << "\n - indirect_function_table_size: " << indirect_function_table_size();
    os << "\n - indirect_function_table_sig_ids: "
       << static_cast<void*>(indirect_function_table_sig_ids());
    os << "\n - indirect_function_table_targets: "
       << static_cast<void*>(indirect_function_table_targets());
    os << "\n";
  }
  
  void WasmExportedFunctionData::WasmExportedFunctionDataPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "WasmExportedFunctionData");
    os << "\n - wrapper_code: " << Brief(wrapper_code());
    os << "\n - instance: " << Brief(instance());
    os << "\n - function_index: " << function_index();
    os << "\n";
  }
  
  void WasmModuleObject::WasmModuleObjectPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "WasmModuleObject");
    os << "\n - module: " << module();
    os << "\n - native module: " << native_module();
    os << "\n - export wrappers: " << Brief(export_wrappers());
    os << "\n - script: " << Brief(script());
    if (has_asm_js_offset_table()) {
      os << "\n - asm_js_offset_table: " << Brief(asm_js_offset_table());
    }
    if (has_breakpoint_infos()) {
      os << "\n - breakpoint_infos: " << Brief(breakpoint_infos());
    }
    os << "\n";
  }
  
  void LoadHandler::LoadHandlerPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "LoadHandler");
    // TODO(ishell): implement printing based on handler kind
    os << "\n - handler: " << Brief(smi_handler());
    os << "\n - validity_cell: " << Brief(validity_cell());
    int data_count = data_field_count();
    if (data_count >= 1) {
      os << "\n - data1: " << Brief(data1());
    }
    if (data_count >= 2) {
      os << "\n - data2: " << Brief(data2());
    }
    if (data_count >= 3) {
      os << "\n - data3: " << Brief(data3());
    }
    os << "\n";
  }
  
  void StoreHandler::StoreHandlerPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "StoreHandler");
    // TODO(ishell): implement printing based on handler kind
    os << "\n - handler: " << Brief(smi_handler());
    os << "\n - validity_cell: " << Brief(validity_cell());
    int data_count = data_field_count();
    if (data_count >= 1) {
      os << "\n - data1: " << Brief(data1());
    }
    if (data_count >= 2) {
      os << "\n - data2: " << Brief(data2());
    }
    if (data_count >= 3) {
      os << "\n - data3: " << Brief(data3());
    }
    os << "\n";
  }
  
  void AccessorPair::AccessorPairPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AccessorPair");
    os << "\n - getter: " << Brief(getter());
    os << "\n - setter: " << Brief(setter());
    os << "\n";
  }
  
  
  void AccessCheckInfo::AccessCheckInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AccessCheckInfo");
    os << "\n - callback: " << Brief(callback());
    os << "\n - named_interceptor: " << Brief(named_interceptor());
    os << "\n - indexed_interceptor: " << Brief(indexed_interceptor());
    os << "\n - data: " << Brief(data());
    os << "\n";
  }
  
  void CallHandlerInfo::CallHandlerInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "CallHandlerInfo");
    os << "\n - callback: " << Brief(callback());
    os << "\n - js_callback: " << Brief(js_callback());
    os << "\n - data: " << Brief(data());
    os << "\n - side_effect_free: "
       << (IsSideEffectFreeCallHandlerInfo() ? "true" : "false");
    os << "\n";
  }
  
  void InterceptorInfo::InterceptorInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "InterceptorInfo");
    os << "\n - getter: " << Brief(getter());
    os << "\n - setter: " << Brief(setter());
    os << "\n - query: " << Brief(query());
    os << "\n - deleter: " << Brief(deleter());
    os << "\n - enumerator: " << Brief(enumerator());
    os << "\n - data: " << Brief(data());
    os << "\n";
  }
  
  
  void FunctionTemplateInfo::FunctionTemplateInfoPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "FunctionTemplateInfo");
    os << "\n - class name: " << Brief(class_name());
    os << "\n - tag: " << Brief(tag());
    os << "\n - serial_number: " << Brief(serial_number());
    os << "\n - property_list: " << Brief(property_list());
    os << "\n - call_code: " << Brief(call_code());
    os << "\n - property_accessors: " << Brief(property_accessors());
    os << "\n - signature: " << Brief(signature());
    os << "\n - cached_property_name: " << Brief(cached_property_name());
    os << "\n - hidden_prototype: " << (hidden_prototype() ? "true" : "false");
    os << "\n - undetectable: " << (undetectable() ? "true" : "false");
    os << "\n - need_access_check: " << (needs_access_check() ? "true" : "false");
    os << "\n - instantiated: " << (instantiated() ? "true" : "false");
    os << "\n - rare_data: " << Brief(rare_data());
    os << "\n";
  }
  
  void FunctionTemplateRareData::FunctionTemplateRareDataPrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "FunctionTemplateRareData");
    os << "\n - prototype_template: " << Brief(prototype_template());
    os << "\n - prototype_provider_template: "
       << Brief(prototype_provider_template());
    os << "\n - parent_template: " << Brief(parent_template());
    os << "\n - named_property_handler: " << Brief(named_property_handler());
    os << "\n - indexed_property_handler: " << Brief(indexed_property_handler());
    os << "\n - instance_template: " << Brief(instance_template());
    os << "\n - instance_call_handler: " << Brief(instance_call_handler());
    os << "\n - access_check_info: " << Brief(access_check_info());
    os << "\n";
  }
  
  void ObjectTemplateInfo::ObjectTemplateInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "ObjectTemplateInfo");
    os << "\n - tag: " << Brief(tag());
    os << "\n - serial_number: " << Brief(serial_number());
    os << "\n - property_list: " << Brief(property_list());
    os << "\n - property_accessors: " << Brief(property_accessors());
    os << "\n - constructor: " << Brief(constructor());
    os << "\n - embedder_field_count: " << embedder_field_count();
    os << "\n - immutable_proto: " << (immutable_proto() ? "true" : "false");
    os << "\n";
  }
  
  
  void AllocationSite::AllocationSitePrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AllocationSite");
    if (this->HasWeakNext()) os << "\n - weak_next: " << Brief(weak_next());
    os << "\n - dependent code: " << Brief(dependent_code());
    os << "\n - nested site: " << Brief(nested_site());
    os << "\n - memento found count: "
       << Brief(Smi::FromInt(memento_found_count()));
    os << "\n - memento create count: "
       << Brief(Smi::FromInt(memento_create_count()));
    os << "\n - pretenure decision: "
       << Brief(Smi::FromInt(pretenure_decision()));
    os << "\n - transition_info: ";
    if (!PointsToLiteral()) {
      ElementsKind kind = GetElementsKind();
      os << "Array allocation with ElementsKind " << ElementsKindToString(kind);
    } else if (boilerplate()->IsJSArray()) {
      os << "Array literal with boilerplate " << Brief(boilerplate());
    } else {
      os << "Object literal with boilerplate " << Brief(boilerplate());
    }
    os << "\n";
  }
  
  
  void AllocationMemento::AllocationMementoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "AllocationMemento");
    os << "\n - allocation site: ";
    if (IsValid()) {
      GetAllocationSite()->AllocationSitePrint(os);
    } else {
      os << "<invalid>\n";
    }
  }
  
  
  void Script::ScriptPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "Script");
    os << "\n - source: " << Brief(source());
    os << "\n - name: " << Brief(name());
    os << "\n - line_offset: " << line_offset();
    os << "\n - column_offset: " << column_offset();
    os << "\n - type: " << type();
    os << "\n - id: " << id();
    os << "\n - context data: " << Brief(context_data());
    os << "\n - compilation type: " << compilation_type();
    os << "\n - line ends: " << Brief(line_ends());
    if (has_eval_from_shared()) {
      os << "\n - eval from shared: " << Brief(eval_from_shared());
    }
    if (is_wrapped()) {
      os << "\n - wrapped arguments: " << Brief(wrapped_arguments());
    }
    os << "\n - eval from position: " << eval_from_position();
    os << "\n - shared function infos: " << Brief(shared_function_infos());
    os << "\n";
  }
  
  #ifdef V8_INTL_SUPPORT
  void JSV8BreakIterator::JSV8BreakIteratorPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSV8BreakIterator");
    os << "\n - locale: " << Brief(locale());
    os << "\n - type: " << TypeAsString();
    os << "\n - break iterator: " << Brief(break_iterator());
    os << "\n - unicode string: " << Brief(unicode_string());
    os << "\n - bound adopt text: " << Brief(bound_adopt_text());
    os << "\n - bound first: " << Brief(bound_first());
    os << "\n - bound next: " << Brief(bound_next());
    os << "\n - bound current: " << Brief(bound_current());
    os << "\n - bound break type: " << Brief(bound_break_type());
    os << "\n";
  }
  
  void JSCollator::JSCollatorPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSCollator");
    os << "\n - icu collator: " << Brief(icu_collator());
    os << "\n - bound compare: " << Brief(bound_compare());
    JSObjectPrintBody(os, this);
  }
  
  void JSDateTimeFormat::JSDateTimeFormatPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSDateTimeFormat");
    os << "\n - icu locale: " << Brief(icu_locale());
    os << "\n - icu simple date format: " << Brief(icu_simple_date_format());
    os << "\n - bound format: " << Brief(bound_format());
    JSObjectPrintBody(os, this);
  }
  
  void JSListFormat::JSListFormatPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSListFormat");
    os << "\n - locale: " << Brief(locale());
    os << "\n - style: " << StyleAsString();
    os << "\n - type: " << TypeAsString();
    os << "\n - icu formatter: " << Brief(icu_formatter());
    JSObjectPrintBody(os, this);
  }
  
  void JSLocale::JSLocalePrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSLocale");
    os << "\n - language: " << Brief(language());
    os << "\n - script: " << Brief(script());
    os << "\n - region: " << Brief(region());
    os << "\n - baseName: " << Brief(base_name());
    os << "\n - locale: " << Brief(locale());
    os << "\n - calendar: " << Brief(calendar());
    os << "\n - caseFirst: " << CaseFirstAsString();
    os << "\n - collation: " << Brief(collation());
    os << "\n - hourCycle: " << HourCycleAsString();
    os << "\n - numeric: " << NumericAsString();
    os << "\n - numberingSystem: " << Brief(numbering_system());
    os << "\n";
  }
  
  void JSNumberFormat::JSNumberFormatPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSNumberFormat");
    os << "\n - locale: " << Brief(locale());
    os << "\n - icu_number_format: " << Brief(icu_number_format());
    os << "\n - bound_format: " << Brief(bound_format());
    os << "\n - style: " << StyleAsString();
    os << "\n - currency_display: " << CurrencyDisplayAsString();
    JSObjectPrintBody(os, this);
  }
  
  void JSPluralRules::JSPluralRulesPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSPluralRules");
    os << "\n - locale: " << Brief(locale());
    os << "\n - type: " << TypeAsString();
    os << "\n - icu plural rules: " << Brief(icu_plural_rules());
    os << "\n - icu decimal format: " << Brief(icu_decimal_format());
    JSObjectPrintBody(os, this);
  }
  
  void JSRelativeTimeFormat::JSRelativeTimeFormatPrint(
      std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSRelativeTimeFormat");
    os << "\n - locale: " << Brief(locale());
    os << "\n - style: " << StyleAsString();
    os << "\n - numeric: " << NumericAsString();
    os << "\n - icu formatter: " << Brief(icu_formatter());
    os << "\n";
  }
  
  void JSSegmentIterator::JSSegmentIteratorPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSSegmentIterator");
    os << "\n - icu break iterator: " << Brief(icu_break_iterator());
    os << "\n - unicode string: " << Brief(unicode_string());
    os << "\n - granularity: " << GranularityAsString();
    os << "\n";
  }
  
  void JSSegmenter::JSSegmenterPrint(std::ostream& os) {  // NOLINT
    JSObjectPrintHeader(os, this, "JSSegmenter");
    os << "\n - locale: " << Brief(locale());
    os << "\n - granularity: " << GranularityAsString();
    os << "\n - lineBreakStyle: " << LineBreakStyleAsString();
    os << "\n - icu break iterator: " << Brief(icu_break_iterator());
    JSObjectPrintBody(os, this);
  }
  #endif  // V8_INTL_SUPPORT
  
  namespace {
  void PrintScopeInfoList(ScopeInfo scope_info, std::ostream& os,
                          const char* list_name, int nof_internal_slots,
                          int start, int length) {
    if (length <= 0) return;
    int end = start + length;
    os << "\n - " << list_name;
    if (nof_internal_slots > 0) {
      os << " " << start << "-" << end << " [internal slots]";
    }
    os << " {\n";
    for (int i = nof_internal_slots; start < end; ++i, ++start) {
      os << "    - " << i << ": ";
      String::cast(scope_info->get(start))->ShortPrint(os);
      os << "\n";
    }
    os << "  }";
  }
  }  // namespace
  
  void ScopeInfo::ScopeInfoPrint(std::ostream& os) {  // NOLINT
    PrintHeader(os, "ScopeInfo");
    if (length() == 0) {
      os << "\n - length = 0\n";
      return;
    }
    int flags = Flags();
  
    os << "\n - parameters: " << ParameterCount();
    os << "\n - context locals : " << ContextLocalCount();
  
    os << "\n - scope type: " << scope_type();
    if (CallsSloppyEval()) os << "\n - sloppy eval";
    os << "\n - language mode: " << language_mode();
    if (is_declaration_scope()) os << "\n - declaration scope";
    if (HasReceiver()) {
      os << "\n - receiver: " << ReceiverVariableField::decode(flags);
    }
    if (HasNewTarget()) os << "\n - needs new target";
    if (HasFunctionName()) {
      os << "\n - function name(" << FunctionVariableField::decode(flags)
         << "): ";
      FunctionName()->ShortPrint(os);
    }
    if (IsAsmModule()) os << "\n - asm module";
    if (HasSimpleParameters()) os << "\n - simple parameters";
    os << "\n - function kind: " << function_kind();
    if (HasOuterScopeInfo()) {
      os << "\n - outer scope info: " << Brief(OuterScopeInfo());
    }
    if (HasFunctionName()) {
      os << "\n - function name: " << Brief(FunctionName());
    }
    if (HasInferredFunctionName()) {
      os << "\n - inferred function name: " << Brief(InferredFunctionName());
    }
  
    if (HasPositionInfo()) {
      os << "\n - start position: " << StartPosition();
      os << "\n - end position: " << EndPosition();
    }
    os << "\n - length: " << length();
    if (length() > 0) {
      PrintScopeInfoList(*this, os, "context slots", Context::MIN_CONTEXT_SLOTS,
                         ContextLocalNamesIndex(), ContextLocalCount());
      // TODO(neis): Print module stuff if present.
    }
    os << "\n";
  }
  
  void DebugInfo::DebugInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "DebugInfo");
    os << "\n - flags: " << flags();
    os << "\n - debugger_hints: " << debugger_hints();
    os << "\n - shared: " << Brief(shared());
    os << "\n - script: " << Brief(script());
    os << "\n - original bytecode array: " << Brief(original_bytecode_array());
    os << "\n - debug bytecode array: " << Brief(debug_bytecode_array());
    os << "\n - break_points: ";
    break_points()->FixedArrayPrint(os);
    os << "\n - coverage_info: " << Brief(coverage_info());
  }
  
  
  void StackFrameInfo::StackFrameInfoPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "StackFrame");
    os << "\n - line_number: " << line_number();
    os << "\n - column_number: " << column_number();
    os << "\n - script_id: " << script_id();
    os << "\n - script_name: " << Brief(script_name());
    os << "\n - script_name_or_source_url: "
       << Brief(script_name_or_source_url());
    os << "\n - function_name: " << Brief(function_name());
    os << "\n - is_eval: " << (is_eval() ? "true" : "false");
    os << "\n - is_constructor: " << (is_constructor() ? "true" : "false");
    os << "\n";
  }
  
  static void PrintBitMask(std::ostream& os, uint32_t value) {  // NOLINT
    for (int i = 0; i < 32; i++) {
      if ((i & 7) == 0) os << " ";
      os << (((value & 1) == 0) ? "_" : "x");
      value >>= 1;
    }
  }
  
  void LayoutDescriptor::Print() {
    StdoutStream os;
    this->Print(os);
    os << std::flush;
  }
  
  void LayoutDescriptor::ShortPrint(std::ostream& os) {
    if (IsSmi()) {
      // Print tagged value for easy use with "jld" gdb macro.
      os << reinterpret_cast<void*>(ptr());
    } else {
      os << Brief(*this);
    }
  }
  
  void LayoutDescriptor::Print(std::ostream& os) {  // NOLINT
    os << "Layout descriptor: ";
    if (IsFastPointerLayout()) {
      os << "<all tagged>";
    } else if (IsSmi()) {
      os << "fast";
      PrintBitMask(os, static_cast<uint32_t>(Smi::ToInt(*this)));
    } else if (IsOddball() && IsUninitialized()) {
      os << "<uninitialized>";
    } else {
      os << "slow";
      int num_words = number_of_layout_words();
      for (int i = 0; i < num_words; i++) {
        if (i > 0) os << " |";
        PrintBitMask(os, get_layout_word(i));
      }
    }
    os << "\n";
  }
  
  void PreParsedScopeData::PreParsedScopeDataPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "PreParsedScopeData");
    os << "\n - scope_data: " << Brief(scope_data());
    os << "\n - length: " << length();
    for (int i = 0; i < length(); ++i) {
      os << "\n - [" << i << "]: " << Brief(child_data(i));
    }
    os << "\n";
  }
  
  void UncompiledDataWithoutPreParsedScope::
      UncompiledDataWithoutPreParsedScopePrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "UncompiledDataWithoutPreParsedScope");
    os << "\n - start position: " << start_position();
    os << "\n - end position: " << end_position();
    os << "\n";
  }
  
  void UncompiledDataWithPreParsedScope::UncompiledDataWithPreParsedScopePrint(
      std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "UncompiledDataWithPreParsedScope");
    os << "\n - start position: " << start_position();
    os << "\n - end position: " << end_position();
    os << "\n - pre_parsed_scope_data: " << Brief(pre_parsed_scope_data());
    os << "\n";
  }
  
  void InterpreterData::InterpreterDataPrint(std::ostream& os) {  // NOLINT
    HeapObject::PrintHeader(os, "InterpreterData");
    os << "\n - bytecode_array: " << Brief(bytecode_array());
    os << "\n - interpreter_trampoline: " << Brief(interpreter_trampoline());
    os << "\n";
  }
  
  void MaybeObject::Print() {
    StdoutStream os;
    this->Print(os);
    os << std::flush;
  }
  
  void MaybeObject::Print(std::ostream& os) {
    Smi smi;
    HeapObject* heap_object;
    if (ToSmi(&smi)) {
      smi->SmiPrint(os);
    } else if (IsCleared()) {
      os << "[cleared]";
    } else if (GetHeapObjectIfWeak(&heap_object)) {
      os << "[weak] ";
      heap_object->HeapObjectPrint(os);
    } else if (GetHeapObjectIfStrong(&heap_object)) {
      heap_object->HeapObjectPrint(os);
    } else {
      UNREACHABLE();
    }
  }
  
  #endif  // OBJECT_PRINT
  
  void HeapNumber::HeapNumberPrint(std::ostream& os) { os << value(); }
  
  void MutableHeapNumber::MutableHeapNumberPrint(std::ostream& os) {
    os << value();
  }
  
  // TODO(cbruni): remove once the new maptracer is in place.
  void Name::NameShortPrint() {
    if (this->IsString()) {
      PrintF("%s", String::cast(*this)->ToCString().get());
    } else {
      DCHECK(this->IsSymbol());
      Symbol s = Symbol::cast(*this);
      if (s->name()->IsUndefined()) {
        PrintF("#<%s>", s->PrivateSymbolToName());
      } else {
        PrintF("<%s>", String::cast(s->name())->ToCString().get());
      }
    }
  }
  
  // TODO(cbruni): remove once the new maptracer is in place.
  int Name::NameShortPrint(Vector<char> str) {
    if (this->IsString()) {
      return SNPrintF(str, "%s", String::cast(*this)->ToCString().get());
    } else {
      DCHECK(this->IsSymbol());
      Symbol s = Symbol::cast(*this);
      if (s->name()->IsUndefined()) {
        return SNPrintF(str, "#<%s>", s->PrivateSymbolToName());
      } else {
        return SNPrintF(str, "<%s>", String::cast(s->name())->ToCString().get());
      }
    }
  }
  
  void Map::PrintMapDetails(std::ostream& os) {
    DisallowHeapAllocation no_gc;
  #ifdef OBJECT_PRINT
    this->MapPrint(os);
  #else
    os << "Map=" << reinterpret_cast<void*>(ptr());
  #endif
    os << "\n";
    instance_descriptors()->PrintDescriptors(os);
  }
  
  void DescriptorArray::PrintDescriptors(std::ostream& os) {
    for (int i = 0; i < number_of_descriptors(); i++) {
      Name key = GetKey(i);
      os << "\n  [" << i << "]: ";
  #ifdef OBJECT_PRINT
      key->NamePrint(os);
  #else
      key->ShortPrint(os);
  #endif
      os << " ";
      PrintDescriptorDetails(os, i, PropertyDetails::kPrintFull);
    }
    os << "\n";
  }
  
  void DescriptorArray::PrintDescriptorDetails(std::ostream& os, int descriptor,
                                               PropertyDetails::PrintMode mode) {
    PropertyDetails details = GetDetails(descriptor);
    details.PrintAsFastTo(os, mode);
    os << " @ ";
    switch (details.location()) {
      case kField: {
        FieldType field_type = GetFieldType(descriptor);
        field_type->PrintTo(os);
        break;
      }
      case kDescriptor:
        Object* value = GetStrongValue(descriptor);
        os << Brief(value);
        if (value->IsAccessorPair()) {
          AccessorPair* pair = AccessorPair::cast(value);
          os << "(get: " << Brief(pair->getter())
             << ", set: " << Brief(pair->setter()) << ")";
        }
        break;
    }
  }
  
  #if defined(DEBUG) || defined(OBJECT_PRINT)
  // This method is only meant to be called from gdb for debugging purposes.
  // Since the string can also be in two-byte encoding, non-Latin1 characters
  // will be ignored in the output.
  char* String::ToAsciiArray() {
    // Static so that subsequent calls frees previously allocated space.
    // This also means that previous results will be overwritten.
    static char* buffer = nullptr;
    if (buffer != nullptr) delete[] buffer;
    buffer = new char[length() + 1];
    WriteToFlat(*this, reinterpret_cast<uint8_t*>(buffer), 0, length());
    buffer[length()] = 0;
    return buffer;
  }
  
  // static
  void TransitionsAccessor::PrintOneTransition(std::ostream& os, Name key,
                                               Map target) {
    os << "\n     ";
  #ifdef OBJECT_PRINT
    key->NamePrint(os);
  #else
    key->ShortPrint(os);
  #endif
    os << ": ";
    ReadOnlyRoots roots = key->GetReadOnlyRoots();
    if (key == roots.nonextensible_symbol()) {
      os << "(transition to non-extensible)";
    } else if (key == roots.sealed_symbol()) {
      os << "(transition to sealed)";
    } else if (key == roots.frozen_symbol()) {
      os << "(transition to frozen)";
    } else if (key == roots.elements_transition_symbol()) {
      os << "(transition to " << ElementsKindToString(target->elements_kind())
         << ")";
    } else if (key == roots.strict_function_transition_symbol()) {
      os << " (transition to strict function)";
    } else {
      DCHECK(!IsSpecialTransition(roots, key));
      os << "(transition to ";
      int descriptor = target->LastAdded();
      DescriptorArray* descriptors = target->instance_descriptors();
      descriptors->PrintDescriptorDetails(os, descriptor,
                                          PropertyDetails::kForTransitions);
      os << ")";
    }
    os << " -> " << Brief(target);
  }
  
  void TransitionArray::PrintInternal(std::ostream& os) {
    int num_transitions = number_of_transitions();
    os << "Transition array #" << num_transitions << ":";
    for (int i = 0; i < num_transitions; i++) {
      Name key = GetKey(i);
      Map target = GetTarget(i);
      TransitionsAccessor::PrintOneTransition(os, key, target);
    }
    os << "\n" << std::flush;
  }
  
  void TransitionsAccessor::PrintTransitions(std::ostream& os) {  // NOLINT
    switch (encoding()) {
      case kPrototypeInfo:
      case kUninitialized:
      case kMigrationTarget:
        return;
      case kWeakRef: {
        Map target = Map::cast(raw_transitions_->GetHeapObjectAssumeWeak());
        Name key = GetSimpleTransitionKey(target);
        PrintOneTransition(os, key, target);
        break;
      }
      case kFullTransitionArray:
        return transitions()->PrintInternal(os);
    }
  }
  
  void TransitionsAccessor::PrintTransitionTree() {
    StdoutStream os;
    os << "map= " << Brief(map_);
    DisallowHeapAllocation no_gc;
    PrintTransitionTree(os, 0, &no_gc);
    os << "\n" << std::flush;
  }
  
  void TransitionsAccessor::PrintTransitionTree(std::ostream& os, int level,
                                                DisallowHeapAllocation* no_gc) {
    ReadOnlyRoots roots = ReadOnlyRoots(isolate_);
    int num_transitions = NumberOfTransitions();
    if (num_transitions == 0) return;
    for (int i = 0; i < num_transitions; i++) {
      Name key = GetKey(i);
      Map target = GetTarget(i);
      os << std::endl
         << "  " << level << "/" << i << ":" << std::setw(level * 2 + 2) << " ";
      std::stringstream ss;
      ss << Brief(target);
      os << std::left << std::setw(50) << ss.str() << ": ";
  
      if (key == roots.nonextensible_symbol()) {
        os << "to non-extensible";
      } else if (key == roots.sealed_symbol()) {
        os << "to sealed ";
      } else if (key == roots.frozen_symbol()) {
        os << "to frozen";
      } else if (key == roots.elements_transition_symbol()) {
        os << "to " << ElementsKindToString(target->elements_kind());
      } else if (key == roots.strict_function_transition_symbol()) {
        os << "to strict function";
      } else {
  #ifdef OBJECT_PRINT
        key->NamePrint(os);
  #else
        key->ShortPrint(os);
  #endif
        os << " ";
        DCHECK(!IsSpecialTransition(ReadOnlyRoots(isolate_), key));
        os << "to ";
        int descriptor = target->LastAdded();
        DescriptorArray* descriptors = target->instance_descriptors();
        descriptors->PrintDescriptorDetails(os, descriptor,
                                            PropertyDetails::kForTransitions);
      }
      TransitionsAccessor transitions(isolate_, target, no_gc);
      transitions.PrintTransitionTree(os, level + 1, no_gc);
    }
  }
  
  void JSObject::PrintTransitions(std::ostream& os) {  // NOLINT
    DisallowHeapAllocation no_gc;
    TransitionsAccessor ta(GetIsolate(), map(), &no_gc);
    if (ta.NumberOfTransitions() == 0) return;
    os << "\n - transitions";
    ta.PrintTransitions(os);
  }
  
  #endif  // defined(DEBUG) || defined(OBJECT_PRINT)
  }  // namespace internal
  }  // namespace v8
  
  //
  // The following functions are used by our gdb macros.
  //
  V8_EXPORT_PRIVATE extern void _v8_internal_Print_Object(void* object) {
    reinterpret_cast<i::Object*>(object)->Print();
  }
  
  V8_EXPORT_PRIVATE extern void _v8_internal_Print_Code(void* object) {
    i::Address address = reinterpret_cast<i::Address>(object);
    i::Isolate* isolate = i::Isolate::Current();
  
    i::wasm::WasmCode* wasm_code =
        isolate->wasm_engine()->code_manager()->LookupCode(address);
    if (wasm_code) {
      i::StdoutStream os;
      wasm_code->Disassemble(nullptr, os, address);
      return;
    }
  
    if (!isolate->heap()->InSpaceSlow(address, i::CODE_SPACE) &&
        !isolate->heap()->InSpaceSlow(address, i::LO_SPACE) &&
        !i::InstructionStream::PcIsOffHeap(isolate, address)) {
      i::PrintF(
          "%p is not within the current isolate's large object, code or embedded "
          "spaces\n",
          object);
      return;
    }
  
    i::Code code = isolate->FindCodeObject(address);
    if (!code->IsCode()) {
      i::PrintF("No code object found containing %p\n", object);
      return;
    }
  #ifdef ENABLE_DISASSEMBLER
    i::StdoutStream os;
    code->Disassemble(nullptr, os, address);
  #else   // ENABLE_DISASSEMBLER
    code->Print();
  #endif  // ENABLE_DISASSEMBLER
  }
  
  V8_EXPORT_PRIVATE extern void _v8_internal_Print_LayoutDescriptor(
      void* object) {
    i::Object* o = reinterpret_cast<i::Object*>(object);
    if (!o->IsLayoutDescriptor()) {
      printf("Please provide a layout descriptor\n");
    } else {
      i::LayoutDescriptor::cast(o)->Print();
    }
  }
  
  V8_EXPORT_PRIVATE extern void _v8_internal_Print_StackTrace() {
    i::Isolate* isolate = i::Isolate::Current();
    isolate->PrintStack(stdout);
  }
  
  V8_EXPORT_PRIVATE extern void _v8_internal_Print_TransitionTree(void* object) {
    i::Object* o = reinterpret_cast<i::Object*>(object);
    if (!o->IsMap()) {
      printf("Please provide a valid Map\n");
    } else {
  #if defined(DEBUG) || defined(OBJECT_PRINT)
      i::DisallowHeapAllocation no_gc;
      i::Map map = i::Map::unchecked_cast(o);
      i::TransitionsAccessor transitions(i::Isolate::Current(), map, &no_gc);
      transitions.PrintTransitionTree();
  #endif
    }
  }
  