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objects-debug.cc
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objects-debug.cc
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// 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/codegen/assembler-inl.h"
#include "src/date/date.h"
#include "src/diagnostics/disasm.h"
#include "src/diagnostics/disassembler.h"
#include "src/heap/combined-heap.h"
#include "src/heap/heap-write-barrier-inl.h"
#include "src/heap/read-only-heap.h"
#include "src/ic/handler-configuration-inl.h"
#include "src/init/bootstrapper.h"
#include "src/logging/counters.h"
#include "src/objects/allocation-site-inl.h"
#include "src/objects/arguments-inl.h"
#include "src/objects/bigint.h"
#include "src/objects/cell-inl.h"
#include "src/objects/data-handler-inl.h"
#include "src/objects/debug-objects-inl.h"
#include "src/objects/elements.h"
#include "src/objects/embedder-data-array-inl.h"
#include "src/objects/embedder-data-slot-inl.h"
#include "src/objects/feedback-cell-inl.h"
#include "src/objects/field-type.h"
#include "src/objects/foreign-inl.h"
#include "src/objects/free-space-inl.h"
#include "src/objects/function-kind.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/layout-descriptor.h"
#include "src/objects/objects-inl.h"
#include "src/objects/objects.h"
#include "src/roots/roots.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"
#include "src/objects/js-display-names-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"
#include "src/objects/js-segments-inl.h"
#endif // V8_INTL_SUPPORT
#include "src/objects/js-weak-refs-inl.h"
#include "src/objects/literal-objects-inl.h"
#include "src/objects/maybe-object.h"
#include "src/objects/microtask-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/oddball-inl.h"
#include "src/objects/promise-inl.h"
#include "src/objects/property-descriptor-object-inl.h"
#include "src/objects/stack-frame-info-inl.h"
#include "src/objects/struct-inl.h"
#include "src/objects/template-objects-inl.h"
#include "src/objects/transitions-inl.h"
#include "src/regexp/regexp.h"
#include "src/utils/ostreams.h"
#include "src/wasm/wasm-objects-inl.h"
#include "torque-generated/class-verifiers-tq.h"
#include "torque-generated/exported-class-definitions-tq-inl.h"
#include "torque-generated/internal-class-definitions-tq-inl.h"
namespace v8 {
namespace internal {
// Heap Verification Overview
// --------------------------
// - Each InstanceType has a separate XXXVerify method which checks an object's
// integrity in isolation.
// - --verify-heap will iterate over all gc spaces and call ObjectVerify() on
// every encountered tagged pointer.
// - Verification should be pushed down to the specific instance type if its
// integrity is independent of an outer object.
// - In cases where the InstanceType is too genernic (e.g. FixedArray) the
// XXXVerify of the outer method has to do recursive verification.
// - If the corresponding objects have inheritence the parent's Verify method
// is called as well.
// - For any field containing pointes VerifyPointer(...) should be called.
//
// Caveats
// -------
// - Assume that any of the verify methods is incomplete!
// - Some integrity checks are only partially done due to objects being in
// partially initialized states when a gc happens, for instance when outer
// objects are allocted before inner ones.
//
#ifdef VERIFY_HEAP
#define USE_TORQUE_VERIFIER(Class) \
void Class::Class##Verify(Isolate* isolate) { \
TorqueGeneratedClassVerifiers::Class##Verify(*this, isolate); \
}
void Object::ObjectVerify(Isolate* isolate) {
RuntimeCallTimerScope timer(isolate, RuntimeCallCounterId::kObjectVerify);
if (IsSmi()) {
Smi::cast(*this).SmiVerify(isolate);
} else {
HeapObject::cast(*this).HeapObjectVerify(isolate);
}
CHECK(!IsConstructor() || IsCallable());
}
void Object::VerifyPointer(Isolate* isolate, Object p) {
if (p.IsHeapObject()) {
HeapObject::VerifyHeapPointer(isolate, p);
} else {
CHECK(p.IsSmi());
}
}
void MaybeObject::VerifyMaybeObjectPointer(Isolate* isolate, MaybeObject p) {
HeapObject heap_object;
if (p->GetHeapObject(&heap_object)) {
HeapObject::VerifyHeapPointer(isolate, heap_object);
} else {
CHECK(p->IsSmi() || p->IsCleared());
}
}
void Smi::SmiVerify(Isolate* isolate) {
CHECK(IsSmi());
CHECK(!IsCallable());
CHECK(!IsConstructor());
}
void TaggedIndex::TaggedIndexVerify(Isolate* isolate) {
CHECK(IsTaggedIndex());
}
void HeapObject::HeapObjectVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::HeapObjectVerify(*this, isolate);
switch (map().instance_type()) {
#define STRING_TYPE_CASE(TYPE, size, name, CamelName) case TYPE:
STRING_TYPE_LIST(STRING_TYPE_CASE)
#undef STRING_TYPE_CASE
if (IsConsString()) {
ConsString::cast(*this).ConsStringVerify(isolate);
} else if (IsSlicedString()) {
SlicedString::cast(*this).SlicedStringVerify(isolate);
} else if (IsThinString()) {
ThinString::cast(*this).ThinStringVerify(isolate);
} else if (IsSeqString()) {
SeqString::cast(*this).SeqStringVerify(isolate);
} else if (IsExternalString()) {
ExternalString::cast(*this).ExternalStringVerify(isolate);
} else {
String::cast(*this).StringVerify(isolate);
}
break;
case OBJECT_BOILERPLATE_DESCRIPTION_TYPE:
ObjectBoilerplateDescription::cast(*this)
.ObjectBoilerplateDescriptionVerify(isolate);
break;
// FixedArray types
case CLOSURE_FEEDBACK_CELL_ARRAY_TYPE:
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 NUMBER_DICTIONARY_TYPE:
case SIMPLE_NUMBER_DICTIONARY_TYPE:
case EPHEMERON_HASH_TABLE_TYPE:
case FIXED_ARRAY_TYPE:
case SCOPE_INFO_TYPE:
case SCRIPT_CONTEXT_TABLE_TYPE:
FixedArray::cast(*this).FixedArrayVerify(isolate);
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:
Context::cast(*this).ContextVerify(isolate);
break;
case NATIVE_CONTEXT_TYPE:
NativeContext::cast(*this).NativeContextVerify(isolate);
break;
case WEAK_FIXED_ARRAY_TYPE:
WeakFixedArray::cast(*this).WeakFixedArrayVerify(isolate);
break;
case FEEDBACK_METADATA_TYPE:
FeedbackMetadata::cast(*this).FeedbackMetadataVerify(isolate);
break;
case TRANSITION_ARRAY_TYPE:
TransitionArray::cast(*this).TransitionArrayVerify(isolate);
break;
case CODE_TYPE:
Code::cast(*this).CodeVerify(isolate);
break;
case JS_OBJECT_TYPE:
case JS_ERROR_TYPE:
case JS_API_OBJECT_TYPE:
case JS_SPECIAL_API_OBJECT_TYPE:
case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
JSObject::cast(*this).JSObjectVerify(isolate);
break;
case WASM_INSTANCE_OBJECT_TYPE:
WasmInstanceObject::cast(*this).WasmInstanceObjectVerify(isolate);
break;
case JS_GENERATOR_OBJECT_TYPE:
JSGeneratorObject::cast(*this).JSGeneratorObjectVerify(isolate);
break;
case JS_SET_KEY_VALUE_ITERATOR_TYPE:
case JS_SET_VALUE_ITERATOR_TYPE:
JSSetIterator::cast(*this).JSSetIteratorVerify(isolate);
break;
case JS_MAP_KEY_ITERATOR_TYPE:
case JS_MAP_KEY_VALUE_ITERATOR_TYPE:
case JS_MAP_VALUE_ITERATOR_TYPE:
JSMapIterator::cast(*this).JSMapIteratorVerify(isolate);
break;
case FILLER_TYPE:
break;
case CODE_DATA_CONTAINER_TYPE:
CodeDataContainer::cast(*this).CodeDataContainerVerify(isolate);
break;
#define MAKE_TORQUE_CASE(Name, TYPE) \
case TYPE: \
Name::cast(*this).Name##Verify(isolate); \
break;
// Every class that has its fields defined in a .tq file and corresponds
// to exactly one InstanceType value is included in the following list.
TORQUE_INSTANCE_CHECKERS_SINGLE_FULLY_DEFINED(MAKE_TORQUE_CASE)
TORQUE_INSTANCE_CHECKERS_MULTIPLE_FULLY_DEFINED(MAKE_TORQUE_CASE)
#undef MAKE_TORQUE_CASE
case FOREIGN_TYPE:
break; // No interesting fields.
case ALLOCATION_SITE_TYPE:
AllocationSite::cast(*this).AllocationSiteVerify(isolate);
break;
case LOAD_HANDLER_TYPE:
LoadHandler::cast(*this).LoadHandlerVerify(isolate);
break;
case STORE_HANDLER_TYPE:
StoreHandler::cast(*this).StoreHandlerVerify(isolate);
break;
}
}
// static
void HeapObject::VerifyHeapPointer(Isolate* isolate, Object p) {
CHECK(p.IsHeapObject());
CHECK(IsValidHeapObject(isolate->heap(), HeapObject::cast(p)));
}
void Symbol::SymbolVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::SymbolVerify(*this, isolate);
CHECK(HasHashCode());
CHECK_GT(Hash(), 0);
CHECK(description().IsUndefined(isolate) || description().IsString());
CHECK_IMPLIES(IsPrivateName(), IsPrivate());
CHECK_IMPLIES(IsPrivateBrand(), IsPrivateName());
}
void BytecodeArray::BytecodeArrayVerify(Isolate* isolate) {
// TODO(oth): Walk bytecodes and immediate values to validate sanity.
// - All bytecodes are known and well formed.
// - Jumps must go to new instructions starts.
// - No Illegal bytecodes.
// - No consecutive sequences of prefix Wide / ExtraWide.
CHECK(IsBytecodeArray());
CHECK(constant_pool().IsFixedArray());
VerifyHeapPointer(isolate, constant_pool());
CHECK(source_position_table().IsUndefined() ||
source_position_table().IsException() ||
source_position_table().IsByteArray());
CHECK(handler_table().IsByteArray());
}
USE_TORQUE_VERIFIER(FeedbackVector)
USE_TORQUE_VERIFIER(JSReceiver)
bool JSObject::ElementsAreSafeToExamine(const Isolate* isolate) const {
// If a GC was caused while constructing this object, the elements
// pointer may point to a one pointer filler map.
return elements(isolate) !=
GetReadOnlyRoots(isolate).one_pointer_filler_map();
}
namespace {
void VerifyJSObjectElements(Isolate* isolate, JSObject object) {
// Only TypedArrays can have these specialized elements.
if (object.IsJSTypedArray()) {
// TODO(bmeurer,v8:4153): Fix CreateTypedArray to either not instantiate
// the object or propertly initialize it on errors during construction.
/* CHECK(object->HasTypedArrayElements()); */
return;
}
CHECK(!object.elements().IsByteArray());
if (object.HasDoubleElements()) {
if (object.elements().length() > 0) {
CHECK(object.elements().IsFixedDoubleArray());
}
return;
}
if (object.HasSloppyArgumentsElements()) {
CHECK(object.elements().IsSloppyArgumentsElements());
return;
}
FixedArray elements = FixedArray::cast(object.elements());
if (object.HasSmiElements()) {
// We might have a partially initialized backing store, in which case we
// allow the hole + smi values.
for (int i = 0; i < elements.length(); i++) {
Object value = elements.get(i);
CHECK(value.IsSmi() || value.IsTheHole(isolate));
}
} else if (object.HasObjectElements()) {
for (int i = 0; i < elements.length(); i++) {
Object element = elements.get(i);
CHECK(!HasWeakHeapObjectTag(element));
}
}
}
} // namespace
void JSObject::JSObjectVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSObjectVerify(*this, isolate);
VerifyHeapPointer(isolate, elements());
CHECK_IMPLIES(HasSloppyArgumentsElements(), IsJSArgumentsObject());
if (HasFastProperties()) {
int actual_unused_property_fields = map().GetInObjectProperties() +
property_array().length() -
map().NextFreePropertyIndex();
if (map().UnusedPropertyFields() != actual_unused_property_fields) {
// There are two reasons why this can happen:
// - in the middle of StoreTransitionStub when the new extended backing
// store is already set into the object and the allocation of the
// HeapNumber triggers GC while the map isn't updated yet.
// - deletion of the last property can leave additional backing store
// capacity behind.
CHECK_GT(actual_unused_property_fields, map().UnusedPropertyFields());
int delta = actual_unused_property_fields - map().UnusedPropertyFields();
CHECK_EQ(0, delta % JSObject::kFieldsAdded);
}
DescriptorArray descriptors = map().instance_descriptors();
bool is_transitionable_fast_elements_kind =
IsTransitionableFastElementsKind(map().elements_kind());
for (InternalIndex i : map().IterateOwnDescriptors()) {
PropertyDetails details = descriptors.GetDetails(i);
if (details.location() == kField) {
DCHECK_EQ(kData, details.kind());
Representation r = details.representation();
FieldIndex index = FieldIndex::ForDescriptor(map(), i);
if (IsUnboxedDoubleField(index)) {
DCHECK(r.IsDouble());
continue;
}
if (COMPRESS_POINTERS_BOOL && index.is_inobject()) {
VerifyObjectField(isolate, index.offset());
}
Object value = RawFastPropertyAt(index);
if (r.IsDouble()) DCHECK(value.IsHeapNumber());
if (value.IsUninitialized(isolate)) continue;
if (r.IsSmi()) DCHECK(value.IsSmi());
if (r.IsHeapObject()) DCHECK(value.IsHeapObject());
FieldType field_type = descriptors.GetFieldType(i);
bool type_is_none = field_type.IsNone();
bool type_is_any = field_type.IsAny();
if (r.IsNone()) {
CHECK(type_is_none);
} else if (!type_is_any && !(type_is_none && r.IsHeapObject())) {
CHECK(!field_type.NowStable() || field_type.NowContains(value));
}
CHECK_IMPLIES(is_transitionable_fast_elements_kind,
Map::IsMostGeneralFieldType(r, field_type));
}
}
if (map().EnumLength() != kInvalidEnumCacheSentinel) {
EnumCache enum_cache = descriptors.enum_cache();
FixedArray keys = enum_cache.keys();
FixedArray indices = enum_cache.indices();
CHECK_LE(map().EnumLength(), keys.length());
CHECK_IMPLIES(indices != ReadOnlyRoots(isolate).empty_fixed_array(),
keys.length() == indices.length());
}
}
// If a GC was caused while constructing this object, the elements
// pointer may point to a one pointer filler map.
if (ElementsAreSafeToExamine(isolate)) {
CHECK_EQ((map().has_fast_smi_or_object_elements() ||
map().has_any_nonextensible_elements() ||
(elements() == GetReadOnlyRoots().empty_fixed_array()) ||
HasFastStringWrapperElements()),
(elements().map() == GetReadOnlyRoots().fixed_array_map() ||
elements().map() == GetReadOnlyRoots().fixed_cow_array_map()));
CHECK_EQ(map().has_fast_object_elements(), HasObjectElements());
VerifyJSObjectElements(isolate, *this);
}
}
void Map::MapVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::MapVerify(*this, isolate);
Heap* heap = isolate->heap();
CHECK(!ObjectInYoungGeneration(*this));
CHECK(FIRST_TYPE <= instance_type() && instance_type() <= LAST_TYPE);
CHECK(instance_size() == kVariableSizeSentinel ||
(kTaggedSize <= instance_size() &&
static_cast<size_t>(instance_size()) < heap->Capacity()));
if (IsContextMap()) {
CHECK(native_context().IsNativeContext());
} else {
if (GetBackPointer().IsUndefined(isolate)) {
// Root maps must not have descriptors in the descriptor array that do not
// belong to the map.
CHECK_EQ(NumberOfOwnDescriptors(),
instance_descriptors().number_of_descriptors());
} else {
// If there is a parent map it must be non-stable.
Map parent = Map::cast(GetBackPointer());
CHECK(!parent.is_stable());
DescriptorArray descriptors = instance_descriptors();
if (descriptors == parent.instance_descriptors()) {
if (NumberOfOwnDescriptors() == parent.NumberOfOwnDescriptors() + 1) {
// Descriptors sharing through property transitions takes over
// ownership from the parent map.
CHECK(!parent.owns_descriptors());
} else {
CHECK_EQ(NumberOfOwnDescriptors(), parent.NumberOfOwnDescriptors());
// Descriptors sharing through special transitions properly takes over
// ownership from the parent map unless it uses the canonical empty
// descriptor array.
if (descriptors != ReadOnlyRoots(isolate).empty_descriptor_array()) {
CHECK_IMPLIES(owns_descriptors(), !parent.owns_descriptors());
CHECK_IMPLIES(parent.owns_descriptors(), !owns_descriptors());
}
}
}
}
}
SLOW_DCHECK(instance_descriptors().IsSortedNoDuplicates());
DisallowHeapAllocation no_gc;
SLOW_DCHECK(
TransitionsAccessor(isolate, *this, &no_gc).IsSortedNoDuplicates());
SLOW_DCHECK(TransitionsAccessor(isolate, *this, &no_gc)
.IsConsistentWithBackPointers());
SLOW_DCHECK(!FLAG_unbox_double_fields ||
layout_descriptor().IsConsistentWithMap(*this));
// Only JSFunction maps have has_prototype_slot() bit set and constructible
// JSFunction objects must have prototype slot.
CHECK_IMPLIES(has_prototype_slot(), instance_type() == JS_FUNCTION_TYPE);
if (!may_have_interesting_symbols()) {
CHECK(!has_named_interceptor());
CHECK(!is_dictionary_map());
CHECK(!is_access_check_needed());
DescriptorArray const descriptors = instance_descriptors();
for (InternalIndex i : IterateOwnDescriptors()) {
CHECK(!descriptors.GetKey(i).IsInterestingSymbol());
}
}
CHECK_IMPLIES(has_named_interceptor(), may_have_interesting_symbols());
CHECK_IMPLIES(is_dictionary_map(), may_have_interesting_symbols());
CHECK_IMPLIES(is_access_check_needed(), may_have_interesting_symbols());
CHECK_IMPLIES(IsJSObjectMap() && !CanHaveFastTransitionableElementsKind(),
IsDictionaryElementsKind(elements_kind()) ||
IsTerminalElementsKind(elements_kind()) ||
IsAnyHoleyNonextensibleElementsKind(elements_kind()));
CHECK_IMPLIES(is_deprecated(), !is_stable());
if (is_prototype_map()) {
DCHECK(prototype_info() == Smi::zero() ||
prototype_info().IsPrototypeInfo());
}
}
void Map::DictionaryMapVerify(Isolate* isolate) {
MapVerify(isolate);
CHECK(is_dictionary_map());
CHECK_EQ(kInvalidEnumCacheSentinel, EnumLength());
CHECK_EQ(ReadOnlyRoots(isolate).empty_descriptor_array(),
instance_descriptors());
CHECK_EQ(0, UnusedPropertyFields());
CHECK_EQ(Map::GetVisitorId(*this), visitor_id());
}
void EmbedderDataArray::EmbedderDataArrayVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::EmbedderDataArrayVerify(*this, isolate);
EmbedderDataSlot start(*this, 0);
EmbedderDataSlot end(*this, length());
for (EmbedderDataSlot slot = start; slot < end; ++slot) {
Object e = slot.load_tagged();
Object::VerifyPointer(isolate, e);
}
}
void WeakFixedArray::WeakFixedArrayVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::WeakFixedArrayVerify(*this, isolate);
for (int i = 0; i < length(); i++) {
MaybeObject::VerifyMaybeObjectPointer(isolate, Get(i));
}
}
void PropertyArray::PropertyArrayVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::PropertyArrayVerify(*this, isolate);
if (length() == 0) {
CHECK_EQ(*this, ReadOnlyRoots(isolate).empty_property_array());
return;
}
// There are no empty PropertyArrays.
CHECK_LT(0, length());
for (int i = 0; i < length(); i++) {
Object e = get(i);
Object::VerifyPointer(isolate, e);
}
}
void FixedDoubleArray::FixedDoubleArrayVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::FixedDoubleArrayVerify(*this, isolate);
for (int i = 0; i < length(); i++) {
if (!is_the_hole(i)) {
uint64_t value = get_representation(i);
uint64_t unexpected =
bit_cast<uint64_t>(std::numeric_limits<double>::quiet_NaN()) &
uint64_t{0x7FF8000000000000};
// Create implementation specific sNaN by inverting relevant bit.
unexpected ^= uint64_t{0x0008000000000000};
CHECK((value & uint64_t{0x7FF8000000000000}) != unexpected ||
(value & uint64_t{0x0007FFFFFFFFFFFF}) == uint64_t{0});
}
}
}
void Context::ContextVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::ContextVerify(*this, isolate);
for (int i = 0; i < length(); i++) {
VerifyObjectField(isolate, OffsetOfElementAt(i));
}
}
void NativeContext::NativeContextVerify(Isolate* isolate) {
ContextVerify(isolate);
CHECK_EQ(length(), NativeContext::NATIVE_CONTEXT_SLOTS);
CHECK_EQ(kVariableSizeSentinel, map().instance_size());
}
void FeedbackMetadata::FeedbackMetadataVerify(Isolate* isolate) {
if (slot_count() == 0 && closure_feedback_cell_count() == 0) {
CHECK_EQ(ReadOnlyRoots(isolate).empty_feedback_metadata(), *this);
} else {
FeedbackMetadataIterator iter(*this);
while (iter.HasNext()) {
iter.Next();
FeedbackSlotKind kind = iter.kind();
CHECK_NE(FeedbackSlotKind::kInvalid, kind);
CHECK_GT(FeedbackSlotKind::kKindsNumber, kind);
}
}
}
void DescriptorArray::DescriptorArrayVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::DescriptorArrayVerify(*this, isolate);
if (number_of_all_descriptors() == 0) {
CHECK_EQ(ReadOnlyRoots(isolate).empty_descriptor_array(), *this);
CHECK_EQ(0, number_of_all_descriptors());
CHECK_EQ(0, number_of_descriptors());
CHECK_EQ(ReadOnlyRoots(isolate).empty_enum_cache(), enum_cache());
} else {
CHECK_LT(0, number_of_all_descriptors());
CHECK_LE(number_of_descriptors(), number_of_all_descriptors());
// Check that properties with private symbols names are non-enumerable, and
// that fields are in order.
int expected_field_index = 0;
for (InternalIndex descriptor :
InternalIndex::Range(number_of_descriptors())) {
Object key = *(GetDescriptorSlot(descriptor.as_int()) + kEntryKeyIndex);
// number_of_descriptors() may be out of sync with the actual descriptors
// written during descriptor array construction.
if (key.IsUndefined(isolate)) continue;
PropertyDetails details = GetDetails(descriptor);
if (Name::cast(key).IsPrivate()) {
CHECK_NE(details.attributes() & DONT_ENUM, 0);
}
MaybeObject value = GetValue(descriptor);
HeapObject heap_object;
if (details.location() == kField) {
CHECK_EQ(details.field_index(), expected_field_index);
CHECK(
value == MaybeObject::FromObject(FieldType::None()) ||
value == MaybeObject::FromObject(FieldType::Any()) ||
value->IsCleared() ||
(value->GetHeapObjectIfWeak(&heap_object) && heap_object.IsMap()));
expected_field_index += details.field_width_in_words();
} else {
CHECK(!value->IsWeakOrCleared());
CHECK(!value->cast<Object>().IsMap());
}
}
}
}
void TransitionArray::TransitionArrayVerify(Isolate* isolate) {
WeakFixedArrayVerify(isolate);
CHECK_LE(LengthFor(number_of_transitions()), length());
}
namespace {
void SloppyArgumentsElementsVerify(Isolate* isolate,
SloppyArgumentsElements elements,
JSObject holder) {
elements.SloppyArgumentsElementsVerify(isolate);
ElementsKind kind = holder.GetElementsKind();
bool is_fast = kind == FAST_SLOPPY_ARGUMENTS_ELEMENTS;
Context context_object = elements.context();
FixedArray arg_elements = elements.arguments();
if (arg_elements.length() == 0) {
CHECK(arg_elements == ReadOnlyRoots(isolate).empty_fixed_array());
return;
}
ElementsAccessor* accessor;
if (is_fast) {
accessor = ElementsAccessor::ForKind(HOLEY_ELEMENTS);
} else {
accessor = ElementsAccessor::ForKind(DICTIONARY_ELEMENTS);
}
int nofMappedParameters = 0;
int maxMappedIndex = 0;
for (int i = 0; i < nofMappedParameters; i++) {
// Verify that each context-mapped argument is either the hole or a valid
// Smi within context length range.
Object mapped = elements.mapped_entries(i);
if (mapped.IsTheHole(isolate)) {
// Slow sloppy arguments can be holey.
if (!is_fast) continue;
// Fast sloppy arguments elements are never holey. Either the element is
// context-mapped or present in the arguments elements.
CHECK(accessor->HasElement(holder, i, arg_elements));
continue;
}
int mappedIndex = Smi::ToInt(mapped);
nofMappedParameters++;
CHECK_LE(maxMappedIndex, mappedIndex);
maxMappedIndex = mappedIndex;
Object value = context_object.get(mappedIndex);
CHECK(value.IsObject());
// None of the context-mapped entries should exist in the arguments
// elements.
CHECK(!accessor->HasElement(holder, i, arg_elements));
}
CHECK_LE(nofMappedParameters, context_object.length());
CHECK_LE(nofMappedParameters, arg_elements.length());
CHECK_LE(maxMappedIndex, context_object.length());
CHECK_LE(maxMappedIndex, arg_elements.length());
}
} // namespace
void JSArgumentsObject::JSArgumentsObjectVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSArgumentsObjectVerify(*this, isolate);
if (IsSloppyArgumentsElementsKind(GetElementsKind())) {
SloppyArgumentsElementsVerify(
isolate, SloppyArgumentsElements::cast(elements()), *this);
}
if (isolate->IsInAnyContext(map(), Context::SLOPPY_ARGUMENTS_MAP_INDEX) ||
isolate->IsInAnyContext(map(),
Context::SLOW_ALIASED_ARGUMENTS_MAP_INDEX) ||
isolate->IsInAnyContext(map(),
Context::FAST_ALIASED_ARGUMENTS_MAP_INDEX)) {
VerifyObjectField(isolate, JSSloppyArgumentsObject::kLengthOffset);
VerifyObjectField(isolate, JSSloppyArgumentsObject::kCalleeOffset);
} else if (isolate->IsInAnyContext(map(),
Context::STRICT_ARGUMENTS_MAP_INDEX)) {
VerifyObjectField(isolate, JSStrictArgumentsObject::kLengthOffset);
}
}
void JSAsyncFunctionObject::JSAsyncFunctionObjectVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSAsyncFunctionObjectVerify(*this, isolate);
promise().HeapObjectVerify(isolate);
}
void JSAsyncGeneratorObject::JSAsyncGeneratorObjectVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSAsyncGeneratorObjectVerify(*this, isolate);
queue().HeapObjectVerify(isolate);
}
void JSDate::JSDateVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSDateVerify(*this, isolate);
if (month().IsSmi()) {
int month = Smi::ToInt(this->month());
CHECK(0 <= month && month <= 11);
}
if (day().IsSmi()) {
int day = Smi::ToInt(this->day());
CHECK(1 <= day && day <= 31);
}
if (hour().IsSmi()) {
int hour = Smi::ToInt(this->hour());
CHECK(0 <= hour && hour <= 23);
}
if (min().IsSmi()) {
int min = Smi::ToInt(this->min());
CHECK(0 <= min && min <= 59);
}
if (sec().IsSmi()) {
int sec = Smi::ToInt(this->sec());
CHECK(0 <= sec && sec <= 59);
}
if (weekday().IsSmi()) {
int weekday = Smi::ToInt(this->weekday());
CHECK(0 <= weekday && weekday <= 6);
}
if (cache_stamp().IsSmi()) {
CHECK(Smi::ToInt(cache_stamp()) <=
Smi::ToInt(isolate->date_cache()->stamp()));
}
}
USE_TORQUE_VERIFIER(JSMessageObject)
void String::StringVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::StringVerify(*this, isolate);
CHECK(length() >= 0 && length() <= Smi::kMaxValue);
CHECK_IMPLIES(length() == 0, *this == ReadOnlyRoots(isolate).empty_string());
if (IsInternalizedString()) {
CHECK(!ObjectInYoungGeneration(*this));
}
}
void ConsString::ConsStringVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::ConsStringVerify(*this, isolate);
CHECK_GE(this->length(), ConsString::kMinLength);
CHECK(this->length() == this->first().length() + this->second().length());
if (this->IsFlat()) {
// A flat cons can only be created by String::SlowFlatten.
// Afterwards, the first part may be externalized or internalized.
CHECK(this->first().IsSeqString() || this->first().IsExternalString() ||
this->first().IsThinString());
}
}
void ThinString::ThinStringVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::ThinStringVerify(*this, isolate);
CHECK(this->actual().IsInternalizedString());
CHECK(this->actual().IsSeqString() || this->actual().IsExternalString());
}
void SlicedString::SlicedStringVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::SlicedStringVerify(*this, isolate);
CHECK(!this->parent().IsConsString());
CHECK(!this->parent().IsSlicedString());
CHECK_GE(this->length(), SlicedString::kMinLength);
}
USE_TORQUE_VERIFIER(ExternalString)
void JSBoundFunction::JSBoundFunctionVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSBoundFunctionVerify(*this, isolate);
CHECK(IsCallable());
CHECK_EQ(IsConstructor(), bound_target_function().IsConstructor());
}
void JSFunction::JSFunctionVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSFunctionVerify(*this, isolate);
CHECK(code().IsCode());
CHECK(map().is_callable());
Handle<JSFunction> function(*this, isolate);
LookupIterator it(isolate, function, isolate->factory()->prototype_string(),
LookupIterator::OWN_SKIP_INTERCEPTOR);
if (has_prototype_slot()) {
VerifyObjectField(isolate, kPrototypeOrInitialMapOffset);
}
if (has_prototype_property()) {
CHECK(it.IsFound());
CHECK_EQ(LookupIterator::ACCESSOR, it.state());
CHECK(it.GetAccessors()->IsAccessorInfo());
} else {
CHECK(!it.IsFound() || it.state() != LookupIterator::ACCESSOR ||
!it.GetAccessors()->IsAccessorInfo());
}
}
void SharedFunctionInfo::SharedFunctionInfoVerify(Isolate* isolate) {
// TODO(leszeks): Add a TorqueGeneratedClassVerifier for LocalIsolate.
TorqueGeneratedClassVerifiers::SharedFunctionInfoVerify(*this, isolate);
this->SharedFunctionInfoVerify(ReadOnlyRoots(isolate));
}
void SharedFunctionInfo::SharedFunctionInfoVerify(LocalIsolate* isolate) {
this->SharedFunctionInfoVerify(ReadOnlyRoots(isolate));
}
void SharedFunctionInfo::SharedFunctionInfoVerify(ReadOnlyRoots roots) {
Object value = name_or_scope_info();
if (value.IsScopeInfo()) {
CHECK_LT(0, ScopeInfo::cast(value).length());
CHECK_NE(value, roots.empty_scope_info());
}
CHECK(HasWasmExportedFunctionData() || IsApiFunction() ||
HasBytecodeArray() || HasAsmWasmData() || HasBuiltinId() ||
HasUncompiledDataWithPreparseData() ||
HasUncompiledDataWithoutPreparseData() || HasWasmJSFunctionData() ||
HasWasmCapiFunctionData());
CHECK(script_or_debug_info().IsUndefined(roots) ||
script_or_debug_info().IsScript() || HasDebugInfo());
if (!is_compiled()) {
CHECK(!HasFeedbackMetadata());
CHECK(outer_scope_info().IsScopeInfo() ||
outer_scope_info().IsTheHole(roots));
} else if (HasBytecodeArray() && HasFeedbackMetadata()) {
CHECK(feedback_metadata().IsFeedbackMetadata());
}
int expected_map_index = Context::FunctionMapIndex(
language_mode(), kind(), HasSharedName(), needs_home_object());
CHECK_EQ(expected_map_index, function_map_index());
if (scope_info().length() > 0) {
ScopeInfo info = scope_info();
CHECK(kind() == info.function_kind());
CHECK_EQ(internal::IsModule(kind()), info.scope_type() == MODULE_SCOPE);
}
if (IsApiFunction()) {
CHECK(construct_as_builtin());
} else if (!HasBuiltinId()) {
CHECK(!construct_as_builtin());
} else {
int id = builtin_id();
if (id != Builtins::kCompileLazy && id != Builtins::kEmptyFunction) {
CHECK(construct_as_builtin());
} else {
CHECK(!construct_as_builtin());
}
}
// At this point we only support skipping arguments adaptor frames
// for strict mode functions (see https://crbug.com/v8/8895).
CHECK_IMPLIES(is_safe_to_skip_arguments_adaptor(),
language_mode() == LanguageMode::kStrict);
}
void JSGlobalProxy::JSGlobalProxyVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSGlobalProxyVerify(*this, isolate);
CHECK(map().is_access_check_needed());
// Make sure that this object has no properties, elements.
CHECK_EQ(0, FixedArray::cast(elements()).length());
}
void JSGlobalObject::JSGlobalObjectVerify(Isolate* isolate) {
CHECK(IsJSGlobalObject());
// Do not check the dummy global object for the builtins.
if (global_dictionary().NumberOfElements() == 0 && elements().length() == 0) {
return;
}
JSObjectVerify(isolate);
}
void Oddball::OddballVerify(Isolate* isolate) {
TorqueGeneratedOddball::OddballVerify(isolate);
Heap* heap = isolate->heap();
Object number = to_number();
if (number.IsHeapObject()) {
CHECK(number == ReadOnlyRoots(heap).nan_value() ||
number == ReadOnlyRoots(heap).hole_nan_value());
} else {
CHECK(number.IsSmi());
int value = Smi::ToInt(number);
// Hidden oddballs have negative smis.
const int kLeastHiddenOddballNumber = -7;
CHECK_LE(value, 1);
CHECK_GE(value, kLeastHiddenOddballNumber);
}
ReadOnlyRoots roots(heap);
if (map() == roots.undefined_map()) {
CHECK(*this == roots.undefined_value());
} else if (map() == roots.the_hole_map()) {
CHECK(*this == roots.the_hole_value());
} else if (map() == roots.null_map()) {
CHECK(*this == roots.null_value());
} else if (map() == roots.boolean_map()) {
CHECK(*this == roots.true_value() || *this == roots.false_value());
} else if (map() == roots.uninitialized_map()) {
CHECK(*this == roots.uninitialized_value());
} else if (map() == roots.arguments_marker_map()) {
CHECK(*this == roots.arguments_marker());
} else if (map() == roots.termination_exception_map()) {
CHECK(*this == roots.termination_exception());
} else if (map() == roots.exception_map()) {
CHECK(*this == roots.exception());
} else if (map() == roots.optimized_out_map()) {
CHECK(*this == roots.optimized_out());
} else if (map() == roots.stale_register_map()) {
CHECK(*this == roots.stale_register());
} else if (map() == roots.self_reference_marker_map()) {
// Multiple instances of this oddball may exist at once.
CHECK_EQ(kind(), Oddball::kSelfReferenceMarker);
} else if (map() == roots.basic_block_counters_marker_map()) {
CHECK(*this == roots.basic_block_counters_marker());
} else {
UNREACHABLE();
}
}
USE_TORQUE_VERIFIER(PropertyCell)
void CodeDataContainer::CodeDataContainerVerify(Isolate* isolate) {
CHECK(IsCodeDataContainer());
VerifyObjectField(isolate, kNextCodeLinkOffset);
CHECK(next_code_link().IsCode() || next_code_link().IsUndefined(isolate));
}
void Code::CodeVerify(Isolate* isolate) {
CHECK_IMPLIES(
has_safepoint_table(),
IsAligned(safepoint_table_offset(), static_cast<unsigned>(kIntSize)));
CHECK_LE(safepoint_table_offset(), handler_table_offset());
CHECK_LE(handler_table_offset(), constant_pool_offset());
CHECK_LE(constant_pool_offset(), code_comments_offset());
CHECK_LE(code_comments_offset(), InstructionSize());
CHECK_IMPLIES(!ReadOnlyHeap::Contains(*this),
IsAligned(raw_instruction_start(), kCodeAlignment));
// TODO(delphick): Refactor Factory::CodeBuilder::BuildInternal, so that the
// following CHECK works builtin trampolines. It currently fails because
// CodeVerify is called halfway through constructing the trampoline and so not
// everything is set up.
// CHECK_EQ(ReadOnlyHeap::Contains(*this), !IsExecutable());
relocation_info().ObjectVerify(isolate);
CHECK(Code::SizeFor(body_size()) <= kMaxRegularHeapObjectSize ||
isolate->heap()->InSpace(*this, CODE_LO_SPACE));
Address last_gc_pc = kNullAddress;
for (RelocIterator it(*this); !it.done(); it.next()) {
it.rinfo()->Verify(isolate);
// Ensure that GC will not iterate twice over the same pointer.
if (RelocInfo::IsGCRelocMode(it.rinfo()->rmode())) {
CHECK(it.rinfo()->pc() != last_gc_pc);
last_gc_pc = it.rinfo()->pc();
}
}
}
void JSArray::JSArrayVerify(Isolate* isolate) {
TorqueGeneratedClassVerifiers::JSArrayVerify(*this, isolate);
// If a GC was caused while constructing this array, the elements
// pointer may point to a one pointer filler map.
if (!ElementsAreSafeToExamine(isolate)) return;
if (elements().IsUndefined(isolate)) return;
CHECK(elements().IsFixedArray() || elements().IsFixedDoubleArray());
if (elements().length() == 0) {
CHECK_EQ(elements(), ReadOnlyRoots(isolate).empty_fixed_array());
}
// Verify that the length and the elements backing store are in sync.
if (length().IsSmi() &&
(HasFastElements() || HasAnyNonextensibleElements())) {
if (elements().length() > 0) {
CHECK_IMPLIES(HasDoubleElements(), elements().IsFixedDoubleArray());
CHECK_IMPLIES(HasSmiOrObjectElements() || HasAnyNonextensibleElements(),
elements().IsFixedArray());
}
int size = Smi::ToInt(length());
// Holey / Packed backing stores might have slack or might have not been
// properly initialized yet.
CHECK(size <= elements().length() ||
elements() == ReadOnlyRoots(isolate).empty_fixed_array());
} else {
CHECK(HasDictionaryElements());