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v8/src/factory.cc
jgruber d3371c23cb [debug] Untangle DebugInfo from break point support 
DebugInfo was very closely tied to break point support:
* It contained only information relevant to break points.
* It was created and freed by break point implementation.
* Existence of a DebugInfo on the shared function info implied existence of
  break points.

This CL is a step towards making DebugInfo usable by other debugging
functionality such as block coverage by decoupling it from break point support,
which is now only one kind of information stored on the DebugInfo object.

BUG=v8:6000

Review-Url: https://codereview.chromium.org/2909893002
Cr-Commit-Position: refs/heads/master@{#45640}
2017-05-31 14:26:58 +00:00

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// Copyright 2014 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/factory.h"
#include "src/accessors.h"
#include "src/allocation-site-scopes.h"
#include "src/ast/ast.h"
#include "src/base/bits.h"
#include "src/bootstrapper.h"
#include "src/compiler.h"
#include "src/conversions.h"
#include "src/isolate-inl.h"
#include "src/macro-assembler.h"
#include "src/objects/debug-objects-inl.h"
#include "src/objects/frame-array-inl.h"
#include "src/objects/module-info.h"
#include "src/objects/scope-info.h"
namespace v8 {
namespace internal {
// Calls the FUNCTION_CALL function and retries it up to three times
// to guarantee that any allocations performed during the call will
// succeed if there's enough memory.
//
// Warning: Do not use the identifiers __object__, __maybe_object__,
// __allocation__ or __scope__ in a call to this macro.
#define RETURN_OBJECT_UNLESS_RETRY(ISOLATE, TYPE) \
if (__allocation__.To(&__object__)) { \
DCHECK(__object__ != (ISOLATE)->heap()->exception()); \
return Handle<TYPE>(TYPE::cast(__object__), ISOLATE); \
}
#define CALL_HEAP_FUNCTION(ISOLATE, FUNCTION_CALL, TYPE) \
do { \
AllocationResult __allocation__ = FUNCTION_CALL; \
Object* __object__ = NULL; \
RETURN_OBJECT_UNLESS_RETRY(ISOLATE, TYPE) \
/* Two GCs before panicking. In newspace will almost always succeed. */ \
for (int __i__ = 0; __i__ < 2; __i__++) { \
(ISOLATE)->heap()->CollectGarbage( \
__allocation__.RetrySpace(), \
GarbageCollectionReason::kAllocationFailure); \
__allocation__ = FUNCTION_CALL; \
RETURN_OBJECT_UNLESS_RETRY(ISOLATE, TYPE) \
} \
(ISOLATE)->counters()->gc_last_resort_from_handles()->Increment(); \
(ISOLATE)->heap()->CollectAllAvailableGarbage( \
GarbageCollectionReason::kLastResort); \
{ \
AlwaysAllocateScope __scope__(ISOLATE); \
__allocation__ = FUNCTION_CALL; \
} \
RETURN_OBJECT_UNLESS_RETRY(ISOLATE, TYPE) \
/* TODO(1181417): Fix this. */ \
v8::internal::Heap::FatalProcessOutOfMemory("CALL_AND_RETRY_LAST", true); \
return Handle<TYPE>(); \
} while (false)
template<typename T>
Handle<T> Factory::New(Handle<Map> map, AllocationSpace space) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->Allocate(*map, space),
T);
}
template<typename T>
Handle<T> Factory::New(Handle<Map> map,
AllocationSpace space,
Handle<AllocationSite> allocation_site) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->Allocate(*map, space, *allocation_site),
T);
}
Handle<HeapObject> Factory::NewFillerObject(int size,
bool double_align,
AllocationSpace space) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateFillerObject(size, double_align, space),
HeapObject);
}
Handle<PrototypeInfo> Factory::NewPrototypeInfo() {
Handle<PrototypeInfo> result =
Handle<PrototypeInfo>::cast(NewStruct(PROTOTYPE_INFO_TYPE));
result->set_prototype_users(WeakFixedArray::Empty());
result->set_registry_slot(PrototypeInfo::UNREGISTERED);
result->set_validity_cell(Smi::kZero);
result->set_bit_field(0);
return result;
}
Handle<Tuple2> Factory::NewTuple2(Handle<Object> value1,
Handle<Object> value2) {
Handle<Tuple2> result = Handle<Tuple2>::cast(NewStruct(TUPLE2_TYPE));
result->set_value1(*value1);
result->set_value2(*value2);
return result;
}
Handle<Tuple3> Factory::NewTuple3(Handle<Object> value1, Handle<Object> value2,
Handle<Object> value3) {
Handle<Tuple3> result = Handle<Tuple3>::cast(NewStruct(TUPLE3_TYPE));
result->set_value1(*value1);
result->set_value2(*value2);
result->set_value3(*value3);
return result;
}
Handle<ContextExtension> Factory::NewContextExtension(
Handle<ScopeInfo> scope_info, Handle<Object> extension) {
Handle<ContextExtension> result =
Handle<ContextExtension>::cast(NewStruct(CONTEXT_EXTENSION_TYPE));
result->set_scope_info(*scope_info);
result->set_extension(*extension);
return result;
}
Handle<ConstantElementsPair> Factory::NewConstantElementsPair(
ElementsKind elements_kind, Handle<FixedArrayBase> constant_values) {
Handle<ConstantElementsPair> result =
Handle<ConstantElementsPair>::cast(NewStruct(TUPLE2_TYPE));
result->set_elements_kind(elements_kind);
result->set_constant_values(*constant_values);
return result;
}
Handle<Oddball> Factory::NewOddball(Handle<Map> map, const char* to_string,
Handle<Object> to_number,
const char* type_of, byte kind) {
Handle<Oddball> oddball = New<Oddball>(map, OLD_SPACE);
Oddball::Initialize(isolate(), oddball, to_string, to_number, type_of, kind);
return oddball;
}
Handle<FixedArray> Factory::NewFixedArray(int size, PretenureFlag pretenure) {
DCHECK(0 <= size);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateFixedArray(size, pretenure),
FixedArray);
}
MaybeHandle<FixedArray> Factory::TryNewFixedArray(int size,
PretenureFlag pretenure) {
DCHECK(0 <= size);
AllocationResult allocation =
isolate()->heap()->AllocateFixedArray(size, pretenure);
Object* array = NULL;
if (!allocation.To(&array)) return MaybeHandle<FixedArray>();
return Handle<FixedArray>(FixedArray::cast(array), isolate());
}
Handle<FixedArray> Factory::NewFixedArrayWithHoles(int size,
PretenureFlag pretenure) {
DCHECK(0 <= size);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateFixedArrayWithFiller(size,
pretenure,
*the_hole_value()),
FixedArray);
}
Handle<FixedArray> Factory::NewUninitializedFixedArray(int size) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateUninitializedFixedArray(size),
FixedArray);
}
Handle<BoilerplateDescription> Factory::NewBoilerplateDescription(
int boilerplate, int all_properties, int index_keys, bool has_seen_proto) {
DCHECK_GE(boilerplate, 0);
DCHECK_GE(all_properties, index_keys);
DCHECK_GE(index_keys, 0);
int backing_store_size =
all_properties - index_keys - (has_seen_proto ? 1 : 0);
DCHECK_GE(backing_store_size, 0);
bool has_different_size_backing_store = boilerplate != backing_store_size;
// Space for name and value for every boilerplate property.
int size = 2 * boilerplate;
if (has_different_size_backing_store) {
// An extra entry for the backing store size.
size++;
}
Handle<BoilerplateDescription> description =
Handle<BoilerplateDescription>::cast(NewFixedArray(size, TENURED));
if (has_different_size_backing_store) {
DCHECK((boilerplate != (all_properties - index_keys)) || has_seen_proto);
description->set_backing_store_size(isolate(), backing_store_size);
}
return description;
}
Handle<FixedArrayBase> Factory::NewFixedDoubleArray(int size,
PretenureFlag pretenure) {
DCHECK(0 <= size);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateUninitializedFixedDoubleArray(size, pretenure),
FixedArrayBase);
}
Handle<FixedArrayBase> Factory::NewFixedDoubleArrayWithHoles(
int size,
PretenureFlag pretenure) {
DCHECK(0 <= size);
Handle<FixedArrayBase> array = NewFixedDoubleArray(size, pretenure);
if (size > 0) {
Handle<FixedDoubleArray>::cast(array)->FillWithHoles(0, size);
}
return array;
}
Handle<FrameArray> Factory::NewFrameArray(int number_of_frames,
PretenureFlag pretenure) {
DCHECK_LE(0, number_of_frames);
Handle<FixedArray> result =
NewFixedArrayWithHoles(FrameArray::LengthFor(number_of_frames));
result->set(FrameArray::kFrameCountIndex, Smi::kZero);
return Handle<FrameArray>::cast(result);
}
Handle<SmallOrderedHashSet> Factory::NewSmallOrderedHashSet(
int size, PretenureFlag pretenure) {
DCHECK_LE(0, size);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateSmallOrderedHashSet(size, pretenure),
SmallOrderedHashSet);
}
Handle<OrderedHashSet> Factory::NewOrderedHashSet() {
return OrderedHashSet::Allocate(isolate(), OrderedHashSet::kMinCapacity);
}
Handle<OrderedHashMap> Factory::NewOrderedHashMap() {
return OrderedHashMap::Allocate(isolate(), OrderedHashMap::kMinCapacity);
}
Handle<AccessorPair> Factory::NewAccessorPair() {
Handle<AccessorPair> accessors =
Handle<AccessorPair>::cast(NewStruct(ACCESSOR_PAIR_TYPE));
accessors->set_getter(*null_value(), SKIP_WRITE_BARRIER);
accessors->set_setter(*null_value(), SKIP_WRITE_BARRIER);
return accessors;
}
Handle<TypeFeedbackInfo> Factory::NewTypeFeedbackInfo() {
Handle<TypeFeedbackInfo> info =
Handle<TypeFeedbackInfo>::cast(NewStruct(TUPLE3_TYPE));
info->initialize_storage();
return info;
}
// Internalized strings are created in the old generation (data space).
Handle<String> Factory::InternalizeUtf8String(Vector<const char> string) {
Utf8StringKey key(string, isolate()->heap()->HashSeed());
return InternalizeStringWithKey(&key);
}
Handle<String> Factory::InternalizeOneByteString(Vector<const uint8_t> string) {
OneByteStringKey key(string, isolate()->heap()->HashSeed());
return InternalizeStringWithKey(&key);
}
Handle<String> Factory::InternalizeOneByteString(
Handle<SeqOneByteString> string, int from, int length) {
SeqOneByteSubStringKey key(string, from, length);
return InternalizeStringWithKey(&key);
}
Handle<String> Factory::InternalizeTwoByteString(Vector<const uc16> string) {
TwoByteStringKey key(string, isolate()->heap()->HashSeed());
return InternalizeStringWithKey(&key);
}
template<class StringTableKey>
Handle<String> Factory::InternalizeStringWithKey(StringTableKey* key) {
return StringTable::LookupKey(isolate(), key);
}
MaybeHandle<String> Factory::NewStringFromOneByte(Vector<const uint8_t> string,
PretenureFlag pretenure) {
int length = string.length();
if (length == 0) return empty_string();
if (length == 1) return LookupSingleCharacterStringFromCode(string[0]);
Handle<SeqOneByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(),
result,
NewRawOneByteString(string.length(), pretenure),
String);
DisallowHeapAllocation no_gc;
// Copy the characters into the new object.
CopyChars(SeqOneByteString::cast(*result)->GetChars(),
string.start(),
length);
return result;
}
MaybeHandle<String> Factory::NewStringFromUtf8(Vector<const char> string,
PretenureFlag pretenure) {
// Check for ASCII first since this is the common case.
const char* start = string.start();
int length = string.length();
int non_ascii_start = String::NonAsciiStart(start, length);
if (non_ascii_start >= length) {
// If the string is ASCII, we do not need to convert the characters
// since UTF8 is backwards compatible with ASCII.
return NewStringFromOneByte(Vector<const uint8_t>::cast(string), pretenure);
}
// Non-ASCII and we need to decode.
Access<UnicodeCache::Utf8Decoder>
decoder(isolate()->unicode_cache()->utf8_decoder());
decoder->Reset(string.start() + non_ascii_start,
length - non_ascii_start);
int utf16_length = static_cast<int>(decoder->Utf16Length());
DCHECK(utf16_length > 0);
// Allocate string.
Handle<SeqTwoByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
NewRawTwoByteString(non_ascii_start + utf16_length, pretenure),
String);
// Copy ASCII portion.
uint16_t* data = result->GetChars();
const char* ascii_data = string.start();
for (int i = 0; i < non_ascii_start; i++) {
*data++ = *ascii_data++;
}
// Now write the remainder.
decoder->WriteUtf16(data, utf16_length);
return result;
}
MaybeHandle<String> Factory::NewStringFromUtf8SubString(
Handle<SeqOneByteString> str, int begin, int length,
PretenureFlag pretenure) {
// Check for ASCII first since this is the common case.
const char* start = reinterpret_cast<const char*>(str->GetChars() + begin);
int non_ascii_start = String::NonAsciiStart(start, length);
if (non_ascii_start >= length) {
// If the string is ASCII, we can just make a substring.
// TODO(v8): the pretenure flag is ignored in this case.
return NewSubString(str, begin, begin + length);
}
// Non-ASCII and we need to decode.
Access<UnicodeCache::Utf8Decoder> decoder(
isolate()->unicode_cache()->utf8_decoder());
decoder->Reset(start + non_ascii_start, length - non_ascii_start);
int utf16_length = static_cast<int>(decoder->Utf16Length());
DCHECK(utf16_length > 0);
// Allocate string.
Handle<SeqTwoByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
NewRawTwoByteString(non_ascii_start + utf16_length, pretenure), String);
// Reset the decoder, because the original {str} may have moved.
const char* ascii_data =
reinterpret_cast<const char*>(str->GetChars() + begin);
decoder->Reset(ascii_data + non_ascii_start, length - non_ascii_start);
// Copy ASCII portion.
uint16_t* data = result->GetChars();
for (int i = 0; i < non_ascii_start; i++) {
*data++ = *ascii_data++;
}
// Now write the remainder.
decoder->WriteUtf16(data, utf16_length);
return result;
}
MaybeHandle<String> Factory::NewStringFromTwoByte(const uc16* string,
int length,
PretenureFlag pretenure) {
if (length == 0) return empty_string();
if (String::IsOneByte(string, length)) {
if (length == 1) return LookupSingleCharacterStringFromCode(string[0]);
Handle<SeqOneByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(),
result,
NewRawOneByteString(length, pretenure),
String);
CopyChars(result->GetChars(), string, length);
return result;
} else {
Handle<SeqTwoByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(),
result,
NewRawTwoByteString(length, pretenure),
String);
CopyChars(result->GetChars(), string, length);
return result;
}
}
MaybeHandle<String> Factory::NewStringFromTwoByte(Vector<const uc16> string,
PretenureFlag pretenure) {
return NewStringFromTwoByte(string.start(), string.length(), pretenure);
}
MaybeHandle<String> Factory::NewStringFromTwoByte(
const ZoneVector<uc16>* string, PretenureFlag pretenure) {
return NewStringFromTwoByte(string->data(), static_cast<int>(string->size()),
pretenure);
}
Handle<String> Factory::NewInternalizedStringFromUtf8(Vector<const char> str,
int chars,
uint32_t hash_field) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateInternalizedStringFromUtf8(
str, chars, hash_field),
String);
}
MUST_USE_RESULT Handle<String> Factory::NewOneByteInternalizedString(
Vector<const uint8_t> str,
uint32_t hash_field) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateOneByteInternalizedString(str, hash_field),
String);
}
MUST_USE_RESULT Handle<String> Factory::NewOneByteInternalizedSubString(
Handle<SeqOneByteString> string, int offset, int length,
uint32_t hash_field) {
CALL_HEAP_FUNCTION(
isolate(), isolate()->heap()->AllocateOneByteInternalizedString(
Vector<const uint8_t>(string->GetChars() + offset, length),
hash_field),
String);
}
MUST_USE_RESULT Handle<String> Factory::NewTwoByteInternalizedString(
Vector<const uc16> str,
uint32_t hash_field) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateTwoByteInternalizedString(str, hash_field),
String);
}
Handle<String> Factory::NewInternalizedStringImpl(
Handle<String> string, int chars, uint32_t hash_field) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateInternalizedStringImpl(
*string, chars, hash_field),
String);
}
namespace {
MaybeHandle<Map> GetInternalizedStringMap(Factory* f, Handle<String> string) {
switch (string->map()->instance_type()) {
case STRING_TYPE:
return f->internalized_string_map();
case ONE_BYTE_STRING_TYPE:
return f->one_byte_internalized_string_map();
case EXTERNAL_STRING_TYPE:
return f->external_internalized_string_map();
case EXTERNAL_ONE_BYTE_STRING_TYPE:
return f->external_one_byte_internalized_string_map();
case EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE:
return f->external_internalized_string_with_one_byte_data_map();
case SHORT_EXTERNAL_STRING_TYPE:
return f->short_external_internalized_string_map();
case SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE:
return f->short_external_one_byte_internalized_string_map();
case SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE:
return f->short_external_internalized_string_with_one_byte_data_map();
default: return MaybeHandle<Map>(); // No match found.
}
}
} // namespace
MaybeHandle<Map> Factory::InternalizedStringMapForString(
Handle<String> string) {
// If the string is in new space it cannot be used as internalized.
if (isolate()->heap()->InNewSpace(*string)) return MaybeHandle<Map>();
return GetInternalizedStringMap(this, string);
}
template <class StringClass>
Handle<StringClass> Factory::InternalizeExternalString(Handle<String> string) {
Handle<StringClass> cast_string = Handle<StringClass>::cast(string);
Handle<Map> map = GetInternalizedStringMap(this, string).ToHandleChecked();
Handle<StringClass> external_string = New<StringClass>(map, OLD_SPACE);
external_string->set_length(cast_string->length());
external_string->set_hash_field(cast_string->hash_field());
external_string->set_resource(nullptr);
isolate()->heap()->RegisterExternalString(*external_string);
return external_string;
}
template Handle<ExternalOneByteString>
Factory::InternalizeExternalString<ExternalOneByteString>(Handle<String>);
template Handle<ExternalTwoByteString>
Factory::InternalizeExternalString<ExternalTwoByteString>(Handle<String>);
MaybeHandle<SeqOneByteString> Factory::NewRawOneByteString(
int length, PretenureFlag pretenure) {
if (length > String::kMaxLength || length < 0) {
THROW_NEW_ERROR(isolate(), NewInvalidStringLengthError(), SeqOneByteString);
}
DCHECK(length > 0); // Use Factory::empty_string() instead.
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateRawOneByteString(length, pretenure),
SeqOneByteString);
}
MaybeHandle<SeqTwoByteString> Factory::NewRawTwoByteString(
int length, PretenureFlag pretenure) {
if (length > String::kMaxLength || length < 0) {
THROW_NEW_ERROR(isolate(), NewInvalidStringLengthError(), SeqTwoByteString);
}
DCHECK(length > 0); // Use Factory::empty_string() instead.
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateRawTwoByteString(length, pretenure),
SeqTwoByteString);
}
Handle<String> Factory::LookupSingleCharacterStringFromCode(uint32_t code) {
if (code <= String::kMaxOneByteCharCodeU) {
{
DisallowHeapAllocation no_allocation;
Object* value = single_character_string_cache()->get(code);
if (value != *undefined_value()) {
return handle(String::cast(value), isolate());
}
}
uint8_t buffer[1];
buffer[0] = static_cast<uint8_t>(code);
Handle<String> result =
InternalizeOneByteString(Vector<const uint8_t>(buffer, 1));
single_character_string_cache()->set(code, *result);
return result;
}
DCHECK(code <= String::kMaxUtf16CodeUnitU);
Handle<SeqTwoByteString> result = NewRawTwoByteString(1).ToHandleChecked();
result->SeqTwoByteStringSet(0, static_cast<uint16_t>(code));
return result;
}
// Returns true for a character in a range. Both limits are inclusive.
static inline bool Between(uint32_t character, uint32_t from, uint32_t to) {
// This makes uses of the the unsigned wraparound.
return character - from <= to - from;
}
static inline Handle<String> MakeOrFindTwoCharacterString(Isolate* isolate,
uint16_t c1,
uint16_t c2) {
// Numeric strings have a different hash algorithm not known by
// LookupTwoCharsStringIfExists, so we skip this step for such strings.
if (!Between(c1, '0', '9') || !Between(c2, '0', '9')) {
Handle<String> result;
if (StringTable::LookupTwoCharsStringIfExists(isolate, c1, c2).
ToHandle(&result)) {
return result;
}
}
// Now we know the length is 2, we might as well make use of that fact
// when building the new string.
if (static_cast<unsigned>(c1 | c2) <= String::kMaxOneByteCharCodeU) {
// We can do this.
DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCodeU +
1)); // because of this.
Handle<SeqOneByteString> str =
isolate->factory()->NewRawOneByteString(2).ToHandleChecked();
uint8_t* dest = str->GetChars();
dest[0] = static_cast<uint8_t>(c1);
dest[1] = static_cast<uint8_t>(c2);
return str;
} else {
Handle<SeqTwoByteString> str =
isolate->factory()->NewRawTwoByteString(2).ToHandleChecked();
uc16* dest = str->GetChars();
dest[0] = c1;
dest[1] = c2;
return str;
}
}
template<typename SinkChar, typename StringType>
Handle<String> ConcatStringContent(Handle<StringType> result,
Handle<String> first,
Handle<String> second) {
DisallowHeapAllocation pointer_stays_valid;
SinkChar* sink = result->GetChars();
String::WriteToFlat(*first, sink, 0, first->length());
String::WriteToFlat(*second, sink + first->length(), 0, second->length());
return result;
}
MaybeHandle<String> Factory::NewConsString(Handle<String> left,
Handle<String> right) {
if (left->IsThinString()) {
left = handle(Handle<ThinString>::cast(left)->actual(), isolate());
}
if (right->IsThinString()) {
right = handle(Handle<ThinString>::cast(right)->actual(), isolate());
}
int left_length = left->length();
if (left_length == 0) return right;
int right_length = right->length();
if (right_length == 0) return left;
int length = left_length + right_length;
if (length == 2) {
uint16_t c1 = left->Get(0);
uint16_t c2 = right->Get(0);
return MakeOrFindTwoCharacterString(isolate(), c1, c2);
}
// Make sure that an out of memory exception is thrown if the length
// of the new cons string is too large.
if (length > String::kMaxLength || length < 0) {
THROW_NEW_ERROR(isolate(), NewInvalidStringLengthError(), String);
}
bool left_is_one_byte = left->IsOneByteRepresentation();
bool right_is_one_byte = right->IsOneByteRepresentation();
bool is_one_byte = left_is_one_byte && right_is_one_byte;
bool is_one_byte_data_in_two_byte_string = false;
if (!is_one_byte) {
// At least one of the strings uses two-byte representation so we
// can't use the fast case code for short one-byte strings below, but
// we can try to save memory if all chars actually fit in one-byte.
is_one_byte_data_in_two_byte_string =
left->HasOnlyOneByteChars() && right->HasOnlyOneByteChars();
if (is_one_byte_data_in_two_byte_string) {
isolate()->counters()->string_add_runtime_ext_to_one_byte()->Increment();
}
}
// If the resulting string is small make a flat string.
if (length < ConsString::kMinLength) {
// Note that neither of the two inputs can be a slice because:
STATIC_ASSERT(ConsString::kMinLength <= SlicedString::kMinLength);
DCHECK(left->IsFlat());
DCHECK(right->IsFlat());
STATIC_ASSERT(ConsString::kMinLength <= String::kMaxLength);
if (is_one_byte) {
Handle<SeqOneByteString> result =
NewRawOneByteString(length).ToHandleChecked();
DisallowHeapAllocation no_gc;
uint8_t* dest = result->GetChars();
// Copy left part.
const uint8_t* src =
left->IsExternalString()
? Handle<ExternalOneByteString>::cast(left)->GetChars()
: Handle<SeqOneByteString>::cast(left)->GetChars();
for (int i = 0; i < left_length; i++) *dest++ = src[i];
// Copy right part.
src = right->IsExternalString()
? Handle<ExternalOneByteString>::cast(right)->GetChars()
: Handle<SeqOneByteString>::cast(right)->GetChars();
for (int i = 0; i < right_length; i++) *dest++ = src[i];
return result;
}
return (is_one_byte_data_in_two_byte_string)
? ConcatStringContent<uint8_t>(
NewRawOneByteString(length).ToHandleChecked(), left, right)
: ConcatStringContent<uc16>(
NewRawTwoByteString(length).ToHandleChecked(), left, right);
}
bool one_byte = (is_one_byte || is_one_byte_data_in_two_byte_string);
return NewConsString(left, right, length, one_byte);
}
Handle<String> Factory::NewConsString(Handle<String> left, Handle<String> right,
int length, bool one_byte) {
DCHECK(!left->IsThinString());
DCHECK(!right->IsThinString());
DCHECK_GE(length, ConsString::kMinLength);
DCHECK_LE(length, String::kMaxLength);
Handle<ConsString> result =
one_byte ? New<ConsString>(cons_one_byte_string_map(), NEW_SPACE)
: New<ConsString>(cons_string_map(), NEW_SPACE);
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = result->GetWriteBarrierMode(no_gc);
result->set_hash_field(String::kEmptyHashField);
result->set_length(length);
result->set_first(*left, mode);
result->set_second(*right, mode);
return result;
}
Handle<String> Factory::NewSurrogatePairString(uint16_t lead, uint16_t trail) {
DCHECK_GE(lead, 0xD800);
DCHECK_LE(lead, 0xDBFF);
DCHECK_GE(trail, 0xDC00);
DCHECK_LE(trail, 0xDFFF);
Handle<SeqTwoByteString> str =
isolate()->factory()->NewRawTwoByteString(2).ToHandleChecked();
uc16* dest = str->GetChars();
dest[0] = lead;
dest[1] = trail;
return str;
}
Handle<String> Factory::NewProperSubString(Handle<String> str,
int begin,
int end) {
#if VERIFY_HEAP
if (FLAG_verify_heap) str->StringVerify();
#endif
DCHECK(begin > 0 || end < str->length());
str = String::Flatten(str);
int length = end - begin;
if (length <= 0) return empty_string();
if (length == 1) {
return LookupSingleCharacterStringFromCode(str->Get(begin));
}
if (length == 2) {
// Optimization for 2-byte strings often used as keys in a decompression
// dictionary. Check whether we already have the string in the string
// table to prevent creation of many unnecessary strings.
uint16_t c1 = str->Get(begin);
uint16_t c2 = str->Get(begin + 1);
return MakeOrFindTwoCharacterString(isolate(), c1, c2);
}
if (!FLAG_string_slices || length < SlicedString::kMinLength) {
if (str->IsOneByteRepresentation()) {
Handle<SeqOneByteString> result =
NewRawOneByteString(length).ToHandleChecked();
uint8_t* dest = result->GetChars();
DisallowHeapAllocation no_gc;
String::WriteToFlat(*str, dest, begin, end);
return result;
} else {
Handle<SeqTwoByteString> result =
NewRawTwoByteString(length).ToHandleChecked();
uc16* dest = result->GetChars();
DisallowHeapAllocation no_gc;
String::WriteToFlat(*str, dest, begin, end);
return result;
}
}
int offset = begin;
if (str->IsSlicedString()) {
Handle<SlicedString> slice = Handle<SlicedString>::cast(str);
str = Handle<String>(slice->parent(), isolate());
offset += slice->offset();
}
if (str->IsThinString()) {
Handle<ThinString> thin = Handle<ThinString>::cast(str);
str = handle(thin->actual(), isolate());
}
DCHECK(str->IsSeqString() || str->IsExternalString());
Handle<Map> map = str->IsOneByteRepresentation()
? sliced_one_byte_string_map()
: sliced_string_map();
Handle<SlicedString> slice = New<SlicedString>(map, NEW_SPACE);
slice->set_hash_field(String::kEmptyHashField);
slice->set_length(length);
slice->set_parent(*str);
slice->set_offset(offset);
return slice;
}
MaybeHandle<String> Factory::NewExternalStringFromOneByte(
const ExternalOneByteString::Resource* resource) {
size_t length = resource->length();
if (length > static_cast<size_t>(String::kMaxLength)) {
THROW_NEW_ERROR(isolate(), NewInvalidStringLengthError(), String);
}
if (length == 0) return empty_string();
Handle<Map> map;
if (resource->IsCompressible()) {
// TODO(hajimehoshi): Rename this to 'uncached_external_one_byte_string_map'
map = short_external_one_byte_string_map();
} else {
map = external_one_byte_string_map();
}
Handle<ExternalOneByteString> external_string =
New<ExternalOneByteString>(map, NEW_SPACE);
external_string->set_length(static_cast<int>(length));
external_string->set_hash_field(String::kEmptyHashField);
external_string->set_resource(resource);
return external_string;
}
MaybeHandle<String> Factory::NewExternalStringFromTwoByte(
const ExternalTwoByteString::Resource* resource) {
size_t length = resource->length();
if (length > static_cast<size_t>(String::kMaxLength)) {
THROW_NEW_ERROR(isolate(), NewInvalidStringLengthError(), String);
}
if (length == 0) return empty_string();
// For small strings we check whether the resource contains only
// one byte characters. If yes, we use a different string map.
static const size_t kOneByteCheckLengthLimit = 32;
bool is_one_byte = length <= kOneByteCheckLengthLimit &&
String::IsOneByte(resource->data(), static_cast<int>(length));
Handle<Map> map;
if (resource->IsCompressible()) {
// TODO(hajimehoshi): Rename these to 'uncached_external_string_...'.
map = is_one_byte ? short_external_string_with_one_byte_data_map()
: short_external_string_map();
} else {
map = is_one_byte ? external_string_with_one_byte_data_map()
: external_string_map();
}
Handle<ExternalTwoByteString> external_string =
New<ExternalTwoByteString>(map, NEW_SPACE);
external_string->set_length(static_cast<int>(length));
external_string->set_hash_field(String::kEmptyHashField);
external_string->set_resource(resource);
return external_string;
}
Handle<ExternalOneByteString> Factory::NewNativeSourceString(
const ExternalOneByteString::Resource* resource) {
size_t length = resource->length();
DCHECK_LE(length, static_cast<size_t>(String::kMaxLength));
Handle<Map> map = native_source_string_map();
Handle<ExternalOneByteString> external_string =
New<ExternalOneByteString>(map, OLD_SPACE);
external_string->set_length(static_cast<int>(length));
external_string->set_hash_field(String::kEmptyHashField);
external_string->set_resource(resource);
return external_string;
}
Handle<JSStringIterator> Factory::NewJSStringIterator(Handle<String> string) {
Handle<Map> map(isolate()->native_context()->string_iterator_map(),
isolate());
Handle<String> flat_string = String::Flatten(string);
Handle<JSStringIterator> iterator =
Handle<JSStringIterator>::cast(NewJSObjectFromMap(map));
iterator->set_string(*flat_string);
iterator->set_index(0);
return iterator;
}
Handle<Symbol> Factory::NewSymbol() {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateSymbol(),
Symbol);
}
Handle<Symbol> Factory::NewPrivateSymbol() {
Handle<Symbol> symbol = NewSymbol();
symbol->set_is_private(true);
return symbol;
}
Handle<JSPromise> Factory::NewJSPromise() {
Handle<JSFunction> constructor(
isolate()->native_context()->promise_function(), isolate());
DCHECK(constructor->has_initial_map());
Handle<Map> map(constructor->initial_map(), isolate());
DCHECK(!map->is_prototype_map());
Handle<JSObject> promise_obj = NewJSObjectFromMap(map);
Handle<JSPromise> promise = Handle<JSPromise>::cast(promise_obj);
promise->set_status(v8::Promise::kPending);
promise->set_flags(0);
for (int i = 0; i < v8::Promise::kEmbedderFieldCount; i++) {
promise->SetEmbedderField(i, Smi::kZero);
}
isolate()->RunPromiseHook(PromiseHookType::kInit, promise, undefined_value());
return promise;
}
Handle<Context> Factory::NewNativeContext() {
Handle<FixedArray> array =
NewFixedArray(Context::NATIVE_CONTEXT_SLOTS, TENURED);
array->set_map_no_write_barrier(*native_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_native_context(*context);
context->set_errors_thrown(Smi::kZero);
context->set_math_random_index(Smi::kZero);
Handle<WeakCell> weak_cell = NewWeakCell(context);
context->set_self_weak_cell(*weak_cell);
DCHECK(context->IsNativeContext());
return context;
}
Handle<Context> Factory::NewScriptContext(Handle<JSFunction> function,
Handle<ScopeInfo> scope_info) {
DCHECK_EQ(scope_info->scope_type(), SCRIPT_SCOPE);
Handle<FixedArray> array =
NewFixedArray(scope_info->ContextLength(), TENURED);
array->set_map_no_write_barrier(*script_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(function->context());
context->set_extension(*scope_info);
context->set_native_context(function->native_context());
DCHECK(context->IsScriptContext());
return context;
}
Handle<ScriptContextTable> Factory::NewScriptContextTable() {
Handle<FixedArray> array = NewFixedArray(1);
array->set_map_no_write_barrier(*script_context_table_map());
Handle<ScriptContextTable> context_table =
Handle<ScriptContextTable>::cast(array);
context_table->set_used(0);
return context_table;
}
Handle<Context> Factory::NewModuleContext(Handle<Module> module,
Handle<JSFunction> function,
Handle<ScopeInfo> scope_info) {
DCHECK_EQ(scope_info->scope_type(), MODULE_SCOPE);
Handle<FixedArray> array =
NewFixedArray(scope_info->ContextLength(), TENURED);
array->set_map_no_write_barrier(*module_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(function->context());
context->set_extension(*module);
context->set_native_context(function->native_context());
DCHECK(context->IsModuleContext());
return context;
}
Handle<Context> Factory::NewFunctionContext(int length,
Handle<JSFunction> function,
ScopeType scope_type) {
DCHECK(function->shared()->scope_info()->scope_type() == scope_type);
DCHECK(length >= Context::MIN_CONTEXT_SLOTS);
Handle<FixedArray> array = NewFixedArray(length);
Handle<Map> map;
switch (scope_type) {
case EVAL_SCOPE:
map = eval_context_map();
break;
case FUNCTION_SCOPE:
map = function_context_map();
break;
default:
UNREACHABLE();
}
array->set_map_no_write_barrier(*map);
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(function->context());
context->set_extension(*the_hole_value());
context->set_native_context(function->native_context());
return context;
}
Handle<Context> Factory::NewCatchContext(Handle<JSFunction> function,
Handle<Context> previous,
Handle<ScopeInfo> scope_info,
Handle<String> name,
Handle<Object> thrown_object) {
STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == Context::THROWN_OBJECT_INDEX);
Handle<ContextExtension> extension = NewContextExtension(scope_info, name);
Handle<FixedArray> array = NewFixedArray(Context::MIN_CONTEXT_SLOTS + 1);
array->set_map_no_write_barrier(*catch_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(*previous);
context->set_extension(*extension);
context->set_native_context(previous->native_context());
context->set(Context::THROWN_OBJECT_INDEX, *thrown_object);
return context;
}
Handle<Context> Factory::NewDebugEvaluateContext(Handle<Context> previous,
Handle<ScopeInfo> scope_info,
Handle<JSReceiver> extension,
Handle<Context> wrapped,
Handle<StringSet> whitelist) {
STATIC_ASSERT(Context::WHITE_LIST_INDEX == Context::MIN_CONTEXT_SLOTS + 1);
DCHECK(scope_info->IsDebugEvaluateScope());
Handle<ContextExtension> context_extension = NewContextExtension(
scope_info, extension.is_null() ? Handle<Object>::cast(undefined_value())
: Handle<Object>::cast(extension));
Handle<FixedArray> array = NewFixedArray(Context::MIN_CONTEXT_SLOTS + 2);
array->set_map_no_write_barrier(*debug_evaluate_context_map());
Handle<Context> c = Handle<Context>::cast(array);
c->set_closure(wrapped.is_null() ? previous->closure() : wrapped->closure());
c->set_previous(*previous);
c->set_native_context(previous->native_context());
c->set_extension(*context_extension);
if (!wrapped.is_null()) c->set(Context::WRAPPED_CONTEXT_INDEX, *wrapped);
if (!whitelist.is_null()) c->set(Context::WHITE_LIST_INDEX, *whitelist);
return c;
}
Handle<Context> Factory::NewWithContext(Handle<JSFunction> function,
Handle<Context> previous,
Handle<ScopeInfo> scope_info,
Handle<JSReceiver> extension) {
Handle<ContextExtension> context_extension =
NewContextExtension(scope_info, extension);
Handle<FixedArray> array = NewFixedArray(Context::MIN_CONTEXT_SLOTS);
array->set_map_no_write_barrier(*with_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(*previous);
context->set_extension(*context_extension);
context->set_native_context(previous->native_context());
return context;
}
Handle<Context> Factory::NewBlockContext(Handle<JSFunction> function,
Handle<Context> previous,
Handle<ScopeInfo> scope_info) {
DCHECK_EQ(scope_info->scope_type(), BLOCK_SCOPE);
Handle<FixedArray> array = NewFixedArray(scope_info->ContextLength());
array->set_map_no_write_barrier(*block_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(*previous);
context->set_extension(*scope_info);
context->set_native_context(previous->native_context());
return context;
}
Handle<Struct> Factory::NewStruct(InstanceType type) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateStruct(type),
Struct);
}
Handle<AliasedArgumentsEntry> Factory::NewAliasedArgumentsEntry(
int aliased_context_slot) {
Handle<AliasedArgumentsEntry> entry = Handle<AliasedArgumentsEntry>::cast(
NewStruct(ALIASED_ARGUMENTS_ENTRY_TYPE));
entry->set_aliased_context_slot(aliased_context_slot);
return entry;
}
Handle<AccessorInfo> Factory::NewAccessorInfo() {
Handle<AccessorInfo> info =
Handle<AccessorInfo>::cast(NewStruct(ACCESSOR_INFO_TYPE));
info->set_flag(0); // Must clear the flag, it was initialized as undefined.
info->set_is_sloppy(true);
return info;
}
Handle<Script> Factory::NewScript(Handle<String> source) {
// Create and initialize script object.
Heap* heap = isolate()->heap();
Handle<Script> script = Handle<Script>::cast(NewStruct(SCRIPT_TYPE));
script->set_source(*source);
script->set_name(heap->undefined_value());
script->set_id(isolate()->heap()->NextScriptId());
script->set_line_offset(0);
script->set_column_offset(0);
script->set_context_data(heap->undefined_value());
script->set_type(Script::TYPE_NORMAL);
script->set_wrapper(heap->undefined_value());
script->set_line_ends(heap->undefined_value());
script->set_eval_from_shared(heap->undefined_value());
script->set_eval_from_position(0);
script->set_shared_function_infos(*empty_fixed_array(), SKIP_WRITE_BARRIER);
script->set_flags(0);
script->set_preparsed_scope_data(
PodArray<uint32_t>::cast(heap->empty_byte_array()));
heap->set_script_list(*WeakFixedArray::Add(script_list(), script));
return script;
}
Handle<Foreign> Factory::NewForeign(Address addr, PretenureFlag pretenure) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->AllocateForeign(addr, pretenure),
Foreign);
}
Handle<Foreign> Factory::NewForeign(const AccessorDescriptor* desc) {
return NewForeign((Address) desc, TENURED);
}
Handle<ByteArray> Factory::NewByteArray(int length, PretenureFlag pretenure) {
DCHECK(0 <= length);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateByteArray(length, pretenure),
ByteArray);
}
Handle<BytecodeArray> Factory::NewBytecodeArray(
int length, const byte* raw_bytecodes, int frame_size, int parameter_count,
Handle<FixedArray> constant_pool) {
DCHECK(0 <= length);
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateBytecodeArray(
length, raw_bytecodes, frame_size,
parameter_count, *constant_pool),
BytecodeArray);
}
Handle<FixedTypedArrayBase> Factory::NewFixedTypedArrayWithExternalPointer(
int length, ExternalArrayType array_type, void* external_pointer,
PretenureFlag pretenure) {
DCHECK(0 <= length && length <= Smi::kMaxValue);
CALL_HEAP_FUNCTION(
isolate(), isolate()->heap()->AllocateFixedTypedArrayWithExternalPointer(
length, array_type, external_pointer, pretenure),
FixedTypedArrayBase);
}
Handle<FixedTypedArrayBase> Factory::NewFixedTypedArray(
int length, ExternalArrayType array_type, bool initialize,
PretenureFlag pretenure) {
DCHECK(0 <= length && length <= Smi::kMaxValue);
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateFixedTypedArray(
length, array_type, initialize, pretenure),
FixedTypedArrayBase);
}
Handle<Cell> Factory::NewCell(Handle<Object> value) {
AllowDeferredHandleDereference convert_to_cell;
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateCell(*value),
Cell);
}
Handle<Cell> Factory::NewNoClosuresCell(Handle<Object> value) {
Handle<Cell> cell = NewCell(value);
cell->set_map_no_write_barrier(*no_closures_cell_map());
return cell;
}
Handle<Cell> Factory::NewOneClosureCell(Handle<Object> value) {
Handle<Cell> cell = NewCell(value);
cell->set_map_no_write_barrier(*one_closure_cell_map());
return cell;
}
Handle<Cell> Factory::NewManyClosuresCell(Handle<Object> value) {
Handle<Cell> cell = NewCell(value);
cell->set_map_no_write_barrier(*many_closures_cell_map());
return cell;
}
Handle<PropertyCell> Factory::NewPropertyCell() {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocatePropertyCell(),
PropertyCell);
}
Handle<WeakCell> Factory::NewWeakCell(Handle<HeapObject> value) {
// It is safe to dereference the value because we are embedding it
// in cell and not inspecting its fields.
AllowDeferredHandleDereference convert_to_cell;
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateWeakCell(*value),
WeakCell);
}
Handle<TransitionArray> Factory::NewTransitionArray(int capacity) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->AllocateTransitionArray(capacity),
TransitionArray);
}
Handle<AllocationSite> Factory::NewAllocationSite() {
Handle<Map> map = allocation_site_map();
Handle<AllocationSite> site = New<AllocationSite>(map, OLD_SPACE);
site->Initialize();
// Link the site
site->set_weak_next(isolate()->heap()->allocation_sites_list());
isolate()->heap()->set_allocation_sites_list(*site);
return site;
}
Handle<Map> Factory::NewMap(InstanceType type,
int instance_size,
ElementsKind elements_kind) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateMap(type, instance_size, elements_kind),
Map);
}
Handle<JSObject> Factory::CopyJSObject(Handle<JSObject> object) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyJSObject(*object, NULL),
JSObject);
}
Handle<JSObject> Factory::CopyJSObjectWithAllocationSite(
Handle<JSObject> object,
Handle<AllocationSite> site) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyJSObject(
*object,
site.is_null() ? NULL : *site),
JSObject);
}
Handle<FixedArray> Factory::CopyFixedArrayWithMap(Handle<FixedArray> array,
Handle<Map> map) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyFixedArrayWithMap(*array, *map),
FixedArray);
}
Handle<FixedArray> Factory::CopyFixedArrayAndGrow(Handle<FixedArray> array,
int grow_by,
PretenureFlag pretenure) {
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->CopyFixedArrayAndGrow(
*array, grow_by, pretenure),
FixedArray);
}
Handle<FixedArray> Factory::CopyFixedArrayUpTo(Handle<FixedArray> array,
int new_len,
PretenureFlag pretenure) {
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->CopyFixedArrayUpTo(
*array, new_len, pretenure),
FixedArray);
}
Handle<FixedArray> Factory::CopyFixedArray(Handle<FixedArray> array) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyFixedArray(*array),
FixedArray);
}
Handle<FixedArray> Factory::CopyAndTenureFixedCOWArray(
Handle<FixedArray> array) {
DCHECK(isolate()->heap()->InNewSpace(*array));
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyAndTenureFixedCOWArray(*array),
FixedArray);
}
Handle<FixedDoubleArray> Factory::CopyFixedDoubleArray(
Handle<FixedDoubleArray> array) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyFixedDoubleArray(*array),
FixedDoubleArray);
}
Handle<Object> Factory::NewNumber(double value,
PretenureFlag pretenure) {
// Materialize as a SMI if possible
int32_t int_value;
if (DoubleToSmiInteger(value, &int_value)) {
return handle(Smi::FromInt(int_value), isolate());
}
// Materialize the value in the heap.
return NewHeapNumber(value, IMMUTABLE, pretenure);
}
Handle<Object> Factory::NewNumberFromInt(int32_t value,
PretenureFlag pretenure) {
if (Smi::IsValid(value)) return handle(Smi::FromInt(value), isolate());
// Bypass NewNumber to avoid various redundant checks.
return NewHeapNumber(FastI2D(value), IMMUTABLE, pretenure);
}
Handle<Object> Factory::NewNumberFromUint(uint32_t value,
PretenureFlag pretenure) {
int32_t int32v = static_cast<int32_t>(value);
if (int32v >= 0 && Smi::IsValid(int32v)) {
return handle(Smi::FromInt(int32v), isolate());
}
return NewHeapNumber(FastUI2D(value), IMMUTABLE, pretenure);
}
Handle<HeapNumber> Factory::NewHeapNumber(MutableMode mode,
PretenureFlag pretenure) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->AllocateHeapNumber(mode, pretenure),
HeapNumber);
}
Handle<Object> Factory::NewError(Handle<JSFunction> constructor,
MessageTemplate::Template template_index,
Handle<Object> arg0, Handle<Object> arg1,
Handle<Object> arg2) {
HandleScope scope(isolate());
if (isolate()->bootstrapper()->IsActive()) {
// During bootstrapping we cannot construct error objects.
return scope.CloseAndEscape(NewStringFromAsciiChecked(
MessageTemplate::TemplateString(template_index)));
}
if (arg0.is_null()) arg0 = undefined_value();
if (arg1.is_null()) arg1 = undefined_value();
if (arg2.is_null()) arg2 = undefined_value();
Handle<Object> result;
if (!ErrorUtils::MakeGenericError(isolate(), constructor, template_index,
arg0, arg1, arg2, SKIP_NONE)
.ToHandle(&result)) {
// If an exception is thrown while
// running the factory method, use the exception as the result.
DCHECK(isolate()->has_pending_exception());
result = handle(isolate()->pending_exception(), isolate());
isolate()->clear_pending_exception();
}
return scope.CloseAndEscape(result);
}
Handle<Object> Factory::NewError(Handle<JSFunction> constructor,
Handle<String> message) {
// Construct a new error object. If an exception is thrown, use the exception
// as the result.
Handle<Object> no_caller;
MaybeHandle<Object> maybe_error =
ErrorUtils::Construct(isolate(), constructor, constructor, message,
SKIP_NONE, no_caller, false);
if (maybe_error.is_null()) {
DCHECK(isolate()->has_pending_exception());
maybe_error = handle(isolate()->pending_exception(), isolate());
isolate()->clear_pending_exception();
}
return maybe_error.ToHandleChecked();
}
Handle<Object> Factory::NewInvalidStringLengthError() {
// Invalidate the "string length" protector.
if (isolate()->IsStringLengthOverflowIntact()) {
isolate()->InvalidateStringLengthOverflowProtector();
}
return NewRangeError(MessageTemplate::kInvalidStringLength);
}
#define DEFINE_ERROR(NAME, name) \
Handle<Object> Factory::New##NAME(MessageTemplate::Template template_index, \
Handle<Object> arg0, Handle<Object> arg1, \
Handle<Object> arg2) { \
return NewError(isolate()->name##_function(), template_index, arg0, arg1, \
arg2); \
}
DEFINE_ERROR(Error, error)
DEFINE_ERROR(EvalError, eval_error)
DEFINE_ERROR(RangeError, range_error)
DEFINE_ERROR(ReferenceError, reference_error)
DEFINE_ERROR(SyntaxError, syntax_error)
DEFINE_ERROR(TypeError, type_error)
DEFINE_ERROR(WasmCompileError, wasm_compile_error)
DEFINE_ERROR(WasmLinkError, wasm_link_error)
DEFINE_ERROR(WasmRuntimeError, wasm_runtime_error)
#undef DEFINE_ERROR
Handle<JSFunction> Factory::NewFunction(Handle<Map> map,
Handle<SharedFunctionInfo> info,
Handle<Object> context_or_undefined,
PretenureFlag pretenure) {
AllocationSpace space = pretenure == TENURED ? OLD_SPACE : NEW_SPACE;
Handle<JSFunction> function = New<JSFunction>(map, space);
DCHECK(context_or_undefined->IsContext() ||
context_or_undefined->IsUndefined(isolate()));
function->initialize_properties();
function->initialize_elements();
function->set_shared(*info);
function->set_code(info->code());
function->set_context(*context_or_undefined);
function->set_prototype_or_initial_map(*the_hole_value());
function->set_feedback_vector_cell(*undefined_cell());
function->set_next_function_link(*undefined_value(), SKIP_WRITE_BARRIER);
isolate()->heap()->InitializeJSObjectBody(*function, *map, JSFunction::kSize);
return function;
}
Handle<JSFunction> Factory::NewFunction(Handle<Map> map,
Handle<String> name,
MaybeHandle<Code> code) {
Handle<Context> context(isolate()->native_context());
Handle<SharedFunctionInfo> info =
NewSharedFunctionInfo(name, code, map->is_constructor());
DCHECK(is_sloppy(info->language_mode()));
DCHECK(!map->IsUndefined(isolate()));
DCHECK(
map.is_identical_to(isolate()->sloppy_function_map()) ||
map.is_identical_to(isolate()->sloppy_function_without_prototype_map()) ||
map.is_identical_to(
isolate()->sloppy_function_with_readonly_prototype_map()) ||
map.is_identical_to(isolate()->strict_function_map()) ||
map.is_identical_to(isolate()->strict_function_without_prototype_map()) ||
// TODO(titzer): wasm_function_map() could be undefined here. ugly.
(*map == context->get(Context::WASM_FUNCTION_MAP_INDEX)) ||
(*map == context->get(Context::NATIVE_FUNCTION_MAP_INDEX)) ||
map.is_identical_to(isolate()->proxy_function_map()));
return NewFunction(map, info, context);
}
Handle<JSFunction> Factory::NewFunction(Handle<String> name) {
return NewFunction(
isolate()->sloppy_function_map(), name, MaybeHandle<Code>());
}
Handle<JSFunction> Factory::NewFunctionWithoutPrototype(Handle<String> name,
Handle<Code> code,
bool is_strict) {
Handle<Map> map = is_strict
? isolate()->strict_function_without_prototype_map()
: isolate()->sloppy_function_without_prototype_map();
return NewFunction(map, name, code);
}
Handle<JSFunction> Factory::NewFunction(Handle<String> name, Handle<Code> code,
Handle<Object> prototype,
bool is_strict) {
Handle<Map> map = is_strict ? isolate()->strict_function_map()
: isolate()->sloppy_function_map();
Handle<JSFunction> result = NewFunction(map, name, code);
result->set_prototype_or_initial_map(*prototype);
return result;
}
Handle<JSFunction> Factory::NewFunction(Handle<String> name, Handle<Code> code,
Handle<Object> prototype,
InstanceType type, int instance_size,
bool is_strict) {
// Allocate the function
Handle<JSFunction> function = NewFunction(name, code, prototype, is_strict);
ElementsKind elements_kind =
type == JS_ARRAY_TYPE ? FAST_SMI_ELEMENTS : FAST_HOLEY_SMI_ELEMENTS;
Handle<Map> initial_map = NewMap(type, instance_size, elements_kind);
// TODO(littledan): Why do we have this is_generator test when
// NewFunctionPrototype already handles finding an appropriately
// shared prototype?
if (!IsResumableFunction(function->shared()->kind())) {
if (prototype->IsTheHole(isolate())) {
prototype = NewFunctionPrototype(function);
}
}
JSFunction::SetInitialMap(function, initial_map,
Handle<JSReceiver>::cast(prototype));
return function;
}
Handle<JSFunction> Factory::NewFunction(Handle<String> name,
Handle<Code> code,
InstanceType type,
int instance_size) {
return NewFunction(name, code, the_hole_value(), type, instance_size);
}
Handle<JSObject> Factory::NewFunctionPrototype(Handle<JSFunction> function) {
// Make sure to use globals from the function's context, since the function
// can be from a different context.
Handle<Context> native_context(function->context()->native_context());
Handle<Map> new_map;
if (V8_UNLIKELY(IsAsyncGeneratorFunction(function->shared()->kind()))) {
new_map = handle(native_context->async_generator_object_prototype_map());
} else if (IsResumableFunction(function->shared()->kind())) {
// Generator and async function prototypes can share maps since they
// don't have "constructor" properties.
new_map = handle(native_context->generator_object_prototype_map());
} else {
// Each function prototype gets a fresh map to avoid unwanted sharing of
// maps between prototypes of different constructors.
Handle<JSFunction> object_function(native_context->object_function());
DCHECK(object_function->has_initial_map());
new_map = handle(object_function->initial_map());
}
DCHECK(!new_map->is_prototype_map());
Handle<JSObject> prototype = NewJSObjectFromMap(new_map);
if (!IsResumableFunction(function->shared()->kind())) {
JSObject::AddProperty(prototype, constructor_string(), function, DONT_ENUM);
}
return prototype;
}
Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
Handle<SharedFunctionInfo> info,
Handle<Context> context,
PretenureFlag pretenure) {
int map_index =
Context::FunctionMapIndex(info->language_mode(), info->kind());
Handle<Map> initial_map(Map::cast(context->native_context()->get(map_index)));
return NewFunctionFromSharedFunctionInfo(initial_map, info, context,
pretenure);
}
Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
Handle<SharedFunctionInfo> info, Handle<Context> context,
Handle<Cell> vector, PretenureFlag pretenure) {
int map_index =
Context::FunctionMapIndex(info->language_mode(), info->kind());
Handle<Map> initial_map(Map::cast(context->native_context()->get(map_index)));
return NewFunctionFromSharedFunctionInfo(initial_map, info, context, vector,
pretenure);
}
Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
Handle<Map> initial_map, Handle<SharedFunctionInfo> info,
Handle<Object> context_or_undefined, PretenureFlag pretenure) {
DCHECK_EQ(JS_FUNCTION_TYPE, initial_map->instance_type());
Handle<JSFunction> result =
NewFunction(initial_map, info, context_or_undefined, pretenure);
if (info->ic_age() != isolate()->heap()->global_ic_age()) {
info->ResetForNewContext(isolate()->heap()->global_ic_age());
}
if (context_or_undefined->IsContext()) {
// Give compiler a chance to pre-initialize.
Compiler::PostInstantiation(result, pretenure);
}
return result;
}
Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
Handle<Map> initial_map, Handle<SharedFunctionInfo> info,
Handle<Object> context_or_undefined, Handle<Cell> vector,
PretenureFlag pretenure) {
DCHECK_EQ(JS_FUNCTION_TYPE, initial_map->instance_type());
Handle<JSFunction> result =
NewFunction(initial_map, info, context_or_undefined, pretenure);
// Bump the closure count that is encoded in the vector cell's map.
if (vector->map() == *no_closures_cell_map()) {
vector->set_map(*one_closure_cell_map());
} else if (vector->map() == *one_closure_cell_map()) {
vector->set_map(*many_closures_cell_map());
} else {
DCHECK_EQ(vector->map(), *many_closures_cell_map());
}
// Check that the optimized code in the feedback vector wasn't marked for
// deoptimization while not pointed to by any live JSFunction.
if (vector->value()->IsFeedbackVector()) {
FeedbackVector::cast(vector->value())
->EvictOptimizedCodeMarkedForDeoptimization(
*info, "new function from shared function info");
}
result->set_feedback_vector_cell(*vector);
if (info->ic_age() != isolate()->heap()->global_ic_age()) {
info->ResetForNewContext(isolate()->heap()->global_ic_age());
}
if (context_or_undefined->IsContext()) {
// Give compiler a chance to pre-initialize.
Compiler::PostInstantiation(result, pretenure);
}
return result;
}
Handle<ScopeInfo> Factory::NewScopeInfo(int length) {
Handle<FixedArray> array = NewFixedArray(length, TENURED);
array->set_map_no_write_barrier(*scope_info_map());
Handle<ScopeInfo> scope_info = Handle<ScopeInfo>::cast(array);
return scope_info;
}
Handle<ModuleInfo> Factory::NewModuleInfo() {
Handle<FixedArray> array = NewFixedArray(ModuleInfo::kLength, TENURED);
array->set_map_no_write_barrier(*module_info_map());
return Handle<ModuleInfo>::cast(array);
}
Handle<JSObject> Factory::NewExternal(void* value) {
Handle<Foreign> foreign = NewForeign(static_cast<Address>(value));
Handle<JSObject> external = NewJSObjectFromMap(external_map());
external->SetEmbedderField(0, *foreign);
return external;
}
Handle<Code> Factory::NewCodeRaw(int object_size, bool immovable) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->AllocateCode(object_size, immovable),
Code);
}
Handle<Code> Factory::NewCode(const CodeDesc& desc,
Code::Flags flags,
Handle<Object> self_ref,
bool immovable,
bool crankshafted,
int prologue_offset,
bool is_debug) {
Handle<ByteArray> reloc_info = NewByteArray(desc.reloc_size, TENURED);
bool has_unwinding_info = desc.unwinding_info != nullptr;
DCHECK((has_unwinding_info && desc.unwinding_info_size > 0) ||
(!has_unwinding_info && desc.unwinding_info_size == 0));
// Compute size.
int body_size = desc.instr_size;
int unwinding_info_size_field_size = kInt64Size;
if (has_unwinding_info) {
body_size = RoundUp(body_size, kInt64Size) + desc.unwinding_info_size +
unwinding_info_size_field_size;
}
int obj_size = Code::SizeFor(RoundUp(body_size, kObjectAlignment));
Handle<Code> code = NewCodeRaw(obj_size, immovable);
DCHECK(!isolate()->heap()->memory_allocator()->code_range()->valid() ||
isolate()->heap()->memory_allocator()->code_range()->contains(
code->address()) ||
obj_size <= isolate()->heap()->code_space()->AreaSize());
// The code object has not been fully initialized yet. We rely on the
// fact that no allocation will happen from this point on.
DisallowHeapAllocation no_gc;
code->set_ic_age(isolate()->heap()->global_ic_age());
code->set_instruction_size(desc.instr_size);
code->set_relocation_info(*reloc_info);
code->set_flags(flags);
code->set_has_unwinding_info(has_unwinding_info);
code->set_raw_kind_specific_flags1(0);
code->set_raw_kind_specific_flags2(0);
code->set_is_crankshafted(crankshafted);
code->set_has_tagged_params(true);
code->set_deoptimization_data(*empty_fixed_array(), SKIP_WRITE_BARRIER);
code->set_raw_type_feedback_info(Smi::kZero);
code->set_next_code_link(*undefined_value(), SKIP_WRITE_BARRIER);
code->set_handler_table(*empty_fixed_array(), SKIP_WRITE_BARRIER);
code->set_source_position_table(*empty_byte_array(), SKIP_WRITE_BARRIER);
code->set_prologue_offset(prologue_offset);
code->set_constant_pool_offset(desc.instr_size - desc.constant_pool_size);
code->set_builtin_index(-1);
code->set_trap_handler_index(Smi::FromInt(-1));
switch (code->kind()) {
case Code::OPTIMIZED_FUNCTION:
code->set_marked_for_deoptimization(false);
break;
case Code::JS_TO_WASM_FUNCTION:
case Code::WASM_FUNCTION:
code->set_has_tagged_params(false);
break;
default:
break;
}
if (is_debug) {
DCHECK(code->kind() == Code::FUNCTION);
code->set_has_debug_break_slots(true);
}
// Allow self references to created code object by patching the handle to
// point to the newly allocated Code object.
if (!self_ref.is_null()) *(self_ref.location()) = *code;
// Migrate generated code.
// The generated code can contain Object** values (typically from handles)
// that are dereferenced during the copy to point directly to the actual heap
// objects. These pointers can include references to the code object itself,
// through the self_reference parameter.
code->CopyFrom(desc);
#ifdef VERIFY_HEAP
if (FLAG_verify_heap) code->ObjectVerify();
#endif
return code;
}
Handle<Code> Factory::CopyCode(Handle<Code> code) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyCode(*code),
Code);
}
Handle<BytecodeArray> Factory::CopyBytecodeArray(
Handle<BytecodeArray> bytecode_array) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyBytecodeArray(*bytecode_array),
BytecodeArray);
}
Handle<JSObject> Factory::NewJSObject(Handle<JSFunction> constructor,
PretenureFlag pretenure) {
JSFunction::EnsureHasInitialMap(constructor);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObject(*constructor, pretenure), JSObject);
}
Handle<JSObject> Factory::NewJSObjectWithNullProto(PretenureFlag pretenure) {
Handle<JSObject> result =
NewJSObject(isolate()->object_function(), pretenure);
Handle<Map> new_map =
Map::Copy(Handle<Map>(result->map()), "ObjectWithNullProto");
Map::SetPrototype(new_map, null_value());
JSObject::MigrateToMap(result, new_map);
return result;
}
Handle<JSGlobalObject> Factory::NewJSGlobalObject(
Handle<JSFunction> constructor) {
DCHECK(constructor->has_initial_map());
Handle<Map> map(constructor->initial_map());
DCHECK(map->is_dictionary_map());
// Make sure no field properties are described in the initial map.
// This guarantees us that normalizing the properties does not
// require us to change property values to PropertyCells.
DCHECK(map->NextFreePropertyIndex() == 0);
// Make sure we don't have a ton of pre-allocated slots in the
// global objects. They will be unused once we normalize the object.
DCHECK(map->unused_property_fields() == 0);
DCHECK(map->GetInObjectProperties() == 0);
// Initial size of the backing store to avoid resize of the storage during
// bootstrapping. The size differs between the JS global object ad the
// builtins object.
int initial_size = 64;
// Allocate a dictionary object for backing storage.
int at_least_space_for = map->NumberOfOwnDescriptors() * 2 + initial_size;
Handle<GlobalDictionary> dictionary =
GlobalDictionary::New(isolate(), at_least_space_for);
// The global object might be created from an object template with accessors.
// Fill these accessors into the dictionary.
Handle<DescriptorArray> descs(map->instance_descriptors());
for (int i = 0; i < map->NumberOfOwnDescriptors(); i++) {
PropertyDetails details = descs->GetDetails(i);
// Only accessors are expected.
DCHECK_EQ(kAccessor, details.kind());
PropertyDetails d(kAccessor, details.attributes(), i + 1,
PropertyCellType::kMutable);
Handle<Name> name(descs->GetKey(i));
Handle<PropertyCell> cell = NewPropertyCell();
cell->set_value(descs->GetValue(i));
// |dictionary| already contains enough space for all properties.
USE(GlobalDictionary::Add(dictionary, name, cell, d));
}
// Allocate the global object and initialize it with the backing store.
Handle<JSGlobalObject> global = New<JSGlobalObject>(map, OLD_SPACE);
isolate()->heap()->InitializeJSObjectFromMap(*global, *dictionary, *map);
// Create a new map for the global object.
Handle<Map> new_map = Map::CopyDropDescriptors(map);
new_map->set_dictionary_map(true);
// Set up the global object as a normalized object.
global->set_map(*new_map);
global->set_properties(*dictionary);
// Make sure result is a global object with properties in dictionary.
DCHECK(global->IsJSGlobalObject() && !global->HasFastProperties());
return global;
}
Handle<JSObject> Factory::NewJSObjectFromMap(
Handle<Map> map,
PretenureFlag pretenure,
Handle<AllocationSite> allocation_site) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObjectFromMap(
*map,
pretenure,
allocation_site.is_null() ? NULL : *allocation_site),
JSObject);
}
Handle<JSObject> Factory::NewSlowJSObjectFromMap(Handle<Map> map, int capacity,
PretenureFlag pretenure) {
DCHECK(map->is_dictionary_map());
Handle<FixedArray> object_properties =
NameDictionary::New(isolate(), capacity);
Handle<JSObject> js_object = NewJSObjectFromMap(map, pretenure);
js_object->set_properties(*object_properties);
return js_object;
}
Handle<JSArray> Factory::NewJSArray(ElementsKind elements_kind,
PretenureFlag pretenure) {
Map* map = isolate()->get_initial_js_array_map(elements_kind);
if (map == nullptr) {
Context* native_context = isolate()->context()->native_context();
JSFunction* array_function = native_context->array_function();
map = array_function->initial_map();
}
return Handle<JSArray>::cast(NewJSObjectFromMap(handle(map), pretenure));
}
Handle<JSArray> Factory::NewJSArray(ElementsKind elements_kind, int length,
int capacity,
ArrayStorageAllocationMode mode,
PretenureFlag pretenure) {
Handle<JSArray> array = NewJSArray(elements_kind, pretenure);
NewJSArrayStorage(array, length, capacity, mode);
return array;
}
Handle<JSArray> Factory::NewJSArrayWithElements(Handle<FixedArrayBase> elements,
ElementsKind elements_kind,
int length,
PretenureFlag pretenure) {
DCHECK(length <= elements->length());
Handle<JSArray> array = NewJSArray(elements_kind, pretenure);
array->set_elements(*elements);
array->set_length(Smi::FromInt(length));
JSObject::ValidateElements(array);
return array;
}
void Factory::NewJSArrayStorage(Handle<JSArray> array,
int length,
int capacity,
ArrayStorageAllocationMode mode) {
DCHECK(capacity >= length);
if (capacity == 0) {
array->set_length(Smi::kZero);
array->set_elements(*empty_fixed_array());
return;
}
HandleScope inner_scope(isolate());
Handle<FixedArrayBase> elms;
ElementsKind elements_kind = array->GetElementsKind();
if (IsFastDoubleElementsKind(elements_kind)) {
if (mode == DONT_INITIALIZE_ARRAY_ELEMENTS) {
elms = NewFixedDoubleArray(capacity);
} else {
DCHECK(mode == INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE);
elms = NewFixedDoubleArrayWithHoles(capacity);
}
} else {
DCHECK(IsFastSmiOrObjectElementsKind(elements_kind));
if (mode == DONT_INITIALIZE_ARRAY_ELEMENTS) {
elms = NewUninitializedFixedArray(capacity);
} else {
DCHECK(mode == INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE);
elms = NewFixedArrayWithHoles(capacity);
}
}
array->set_elements(*elms);
array->set_length(Smi::FromInt(length));
}
Handle<JSModuleNamespace> Factory::NewJSModuleNamespace() {
Handle<Map> map = isolate()->js_module_namespace_map();
Handle<JSModuleNamespace> module_namespace(
Handle<JSModuleNamespace>::cast(NewJSObjectFromMap(map)));
FieldIndex index = FieldIndex::ForDescriptor(
*map, JSModuleNamespace::kToStringTagFieldIndex);
module_namespace->FastPropertyAtPut(index,
isolate()->heap()->Module_string());
return module_namespace;
}
Handle<JSGeneratorObject> Factory::NewJSGeneratorObject(
Handle<JSFunction> function) {
DCHECK(IsResumableFunction(function->shared()->kind()));
JSFunction::EnsureHasInitialMap(function);
Handle<Map> map(function->initial_map());
DCHECK(map->instance_type() == JS_GENERATOR_OBJECT_TYPE ||
map->instance_type() == JS_ASYNC_GENERATOR_OBJECT_TYPE);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObjectFromMap(*map),
JSGeneratorObject);
}
Handle<Module> Factory::NewModule(Handle<SharedFunctionInfo> code) {
Handle<ModuleInfo> module_info(code->scope_info()->ModuleDescriptorInfo(),
isolate());
Handle<ObjectHashTable> exports =
ObjectHashTable::New(isolate(), module_info->RegularExportCount());
Handle<FixedArray> regular_exports =
NewFixedArray(module_info->RegularExportCount());
Handle<FixedArray> regular_imports =
NewFixedArray(module_info->regular_imports()->length());
int requested_modules_length = module_info->module_requests()->length();
Handle<FixedArray> requested_modules =
requested_modules_length > 0 ? NewFixedArray(requested_modules_length)
: empty_fixed_array();
Handle<Module> module = Handle<Module>::cast(NewStruct(MODULE_TYPE));
module->set_code(*code);
module->set_exports(*exports);
module->set_regular_exports(*regular_exports);
module->set_regular_imports(*regular_imports);
module->set_hash(isolate()->GenerateIdentityHash(Smi::kMaxValue));
module->set_module_namespace(isolate()->heap()->undefined_value());
module->set_requested_modules(*requested_modules);
module->set_status(Module::kUnprepared);
DCHECK(!module->instantiated());
DCHECK(!module->evaluated());
return module;
}
Handle<JSArrayBuffer> Factory::NewJSArrayBuffer(SharedFlag shared,
PretenureFlag pretenure) {
Handle<JSFunction> array_buffer_fun(
shared == SharedFlag::kShared
? isolate()->native_context()->shared_array_buffer_fun()
: isolate()->native_context()->array_buffer_fun());
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateJSObject(
*array_buffer_fun, pretenure),
JSArrayBuffer);
}
Handle<JSDataView> Factory::NewJSDataView() {
Handle<JSFunction> data_view_fun(
isolate()->native_context()->data_view_fun());
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObject(*data_view_fun),
JSDataView);
}
Handle<JSIteratorResult> Factory::NewJSIteratorResult(Handle<Object> value,
bool done) {
Handle<Map> map(isolate()->native_context()->iterator_result_map());
Handle<JSIteratorResult> js_iter_result =
Handle<JSIteratorResult>::cast(NewJSObjectFromMap(map));
js_iter_result->set_value(*value);
js_iter_result->set_done(*ToBoolean(done));
return js_iter_result;
}
Handle<JSAsyncFromSyncIterator> Factory::NewJSAsyncFromSyncIterator(
Handle<JSReceiver> sync_iterator) {
Handle<Map> map(isolate()->native_context()->async_from_sync_iterator_map());
Handle<JSAsyncFromSyncIterator> iterator =
Handle<JSAsyncFromSyncIterator>::cast(NewJSObjectFromMap(map));
iterator->set_sync_iterator(*sync_iterator);
return iterator;
}
Handle<JSMap> Factory::NewJSMap() {
Handle<Map> map(isolate()->native_context()->js_map_map());
Handle<JSMap> js_map = Handle<JSMap>::cast(NewJSObjectFromMap(map));
JSMap::Initialize(js_map, isolate());
return js_map;
}
Handle<JSSet> Factory::NewJSSet() {
Handle<Map> map(isolate()->native_context()->js_set_map());
Handle<JSSet> js_set = Handle<JSSet>::cast(NewJSObjectFromMap(map));
JSSet::Initialize(js_set, isolate());
return js_set;
}
Handle<JSMapIterator> Factory::NewJSMapIterator() {
Handle<Map> map(isolate()->native_context()->map_iterator_map());
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->AllocateJSObjectFromMap(*map),
JSMapIterator);
}
Handle<JSSetIterator> Factory::NewJSSetIterator() {
Handle<Map> map(isolate()->native_context()->set_iterator_map());
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->AllocateJSObjectFromMap(*map),
JSSetIterator);
}
ExternalArrayType Factory::GetArrayTypeFromElementsKind(ElementsKind kind) {
switch (kind) {
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS: \
return kExternal##Type##Array;
TYPED_ARRAYS(TYPED_ARRAY_CASE)
default:
UNREACHABLE();
}
#undef TYPED_ARRAY_CASE
}
size_t Factory::GetExternalArrayElementSize(ExternalArrayType type) {
switch (type) {
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case kExternal##Type##Array: \
return size;
TYPED_ARRAYS(TYPED_ARRAY_CASE)
default:
UNREACHABLE();
}
#undef TYPED_ARRAY_CASE
}
namespace {
ElementsKind GetExternalArrayElementsKind(ExternalArrayType type) {
switch (type) {
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case kExternal##Type##Array: \
return TYPE##_ELEMENTS;
TYPED_ARRAYS(TYPED_ARRAY_CASE)
}
UNREACHABLE();
#undef TYPED_ARRAY_CASE
}
size_t GetFixedTypedArraysElementSize(ElementsKind kind) {
switch (kind) {
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS: \
return size;
TYPED_ARRAYS(TYPED_ARRAY_CASE)
default:
UNREACHABLE();
}
#undef TYPED_ARRAY_CASE
}
JSFunction* GetTypedArrayFun(ExternalArrayType type, Isolate* isolate) {
Context* native_context = isolate->context()->native_context();
switch (type) {
#define TYPED_ARRAY_FUN(Type, type, TYPE, ctype, size) \
case kExternal##Type##Array: \
return native_context->type##_array_fun();
TYPED_ARRAYS(TYPED_ARRAY_FUN)
#undef TYPED_ARRAY_FUN
default:
UNREACHABLE();
}
}
JSFunction* GetTypedArrayFun(ElementsKind elements_kind, Isolate* isolate) {
Context* native_context = isolate->context()->native_context();
switch (elements_kind) {
#define TYPED_ARRAY_FUN(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS: \
return native_context->type##_array_fun();
TYPED_ARRAYS(TYPED_ARRAY_FUN)
#undef TYPED_ARRAY_FUN
default:
UNREACHABLE();
}
}
void SetupArrayBufferView(i::Isolate* isolate,
i::Handle<i::JSArrayBufferView> obj,
i::Handle<i::JSArrayBuffer> buffer,
size_t byte_offset, size_t byte_length,
PretenureFlag pretenure = NOT_TENURED) {
DCHECK(byte_offset + byte_length <=
static_cast<size_t>(buffer->byte_length()->Number()));
DCHECK_EQ(obj->GetEmbedderFieldCount(),
v8::ArrayBufferView::kEmbedderFieldCount);
for (int i = 0; i < v8::ArrayBufferView::kEmbedderFieldCount; i++) {
obj->SetEmbedderField(i, Smi::kZero);
}
obj->set_buffer(*buffer);
i::Handle<i::Object> byte_offset_object =
isolate->factory()->NewNumberFromSize(byte_offset, pretenure);
obj->set_byte_offset(*byte_offset_object);
i::Handle<i::Object> byte_length_object =
isolate->factory()->NewNumberFromSize(byte_length, pretenure);
obj->set_byte_length(*byte_length_object);
}
} // namespace
Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type,
PretenureFlag pretenure) {
Handle<JSFunction> typed_array_fun_handle(GetTypedArrayFun(type, isolate()));
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateJSObject(
*typed_array_fun_handle, pretenure),
JSTypedArray);
}
Handle<JSTypedArray> Factory::NewJSTypedArray(ElementsKind elements_kind,
PretenureFlag pretenure) {
Handle<JSFunction> typed_array_fun_handle(
GetTypedArrayFun(elements_kind, isolate()));
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateJSObject(
*typed_array_fun_handle, pretenure),
JSTypedArray);
}
Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type,
Handle<JSArrayBuffer> buffer,
size_t byte_offset, size_t length,
PretenureFlag pretenure) {
Handle<JSTypedArray> obj = NewJSTypedArray(type, pretenure);
size_t element_size = GetExternalArrayElementSize(type);
ElementsKind elements_kind = GetExternalArrayElementsKind(type);
CHECK(byte_offset % element_size == 0);
CHECK(length <= (std::numeric_limits<size_t>::max() / element_size));
CHECK(length <= static_cast<size_t>(Smi::kMaxValue));
size_t byte_length = length * element_size;
SetupArrayBufferView(isolate(), obj, buffer, byte_offset, byte_length,
pretenure);
Handle<Object> length_object = NewNumberFromSize(length, pretenure);
obj->set_length(*length_object);
Handle<FixedTypedArrayBase> elements = NewFixedTypedArrayWithExternalPointer(
static_cast<int>(length), type,
static_cast<uint8_t*>(buffer->backing_store()) + byte_offset, pretenure);
Handle<Map> map = JSObject::GetElementsTransitionMap(obj, elements_kind);
JSObject::SetMapAndElements(obj, map, elements);
return obj;
}
Handle<JSTypedArray> Factory::NewJSTypedArray(ElementsKind elements_kind,
size_t number_of_elements,
PretenureFlag pretenure) {
Handle<JSTypedArray> obj = NewJSTypedArray(elements_kind, pretenure);
DCHECK_EQ(obj->GetEmbedderFieldCount(),
v8::ArrayBufferView::kEmbedderFieldCount);
for (int i = 0; i < v8::ArrayBufferView::kEmbedderFieldCount; i++) {
obj->SetEmbedderField(i, Smi::kZero);
}
size_t element_size = GetFixedTypedArraysElementSize(elements_kind);
ExternalArrayType array_type = GetArrayTypeFromElementsKind(elements_kind);
CHECK(number_of_elements <=
(std::numeric_limits<size_t>::max() / element_size));
CHECK(number_of_elements <= static_cast<size_t>(Smi::kMaxValue));
size_t byte_length = number_of_elements * element_size;
obj->set_byte_offset(Smi::kZero);
i::Handle<i::Object> byte_length_object =
NewNumberFromSize(byte_length, pretenure);
obj->set_byte_length(*byte_length_object);
Handle<Object> length_object =
NewNumberFromSize(number_of_elements, pretenure);
obj->set_length(*length_object);
Handle<JSArrayBuffer> buffer =
NewJSArrayBuffer(SharedFlag::kNotShared, pretenure);
JSArrayBuffer::Setup(buffer, isolate(), true, NULL, byte_length,
SharedFlag::kNotShared);
obj->set_buffer(*buffer);
Handle<FixedTypedArrayBase> elements = NewFixedTypedArray(
static_cast<int>(number_of_elements), array_type, true, pretenure);
obj->set_elements(*elements);
return obj;
}
Handle<JSDataView> Factory::NewJSDataView(Handle<JSArrayBuffer> buffer,
size_t byte_offset,
size_t byte_length) {
Handle<JSDataView> obj = NewJSDataView();
SetupArrayBufferView(isolate(), obj, buffer, byte_offset, byte_length);
return obj;
}
MaybeHandle<JSBoundFunction> Factory::NewJSBoundFunction(
Handle<JSReceiver> target_function, Handle<Object> bound_this,
Vector<Handle<Object>> bound_args) {
DCHECK(target_function->IsCallable());
STATIC_ASSERT(Code::kMaxArguments <= FixedArray::kMaxLength);
if (bound_args.length() >= Code::kMaxArguments) {
THROW_NEW_ERROR(isolate(),
NewRangeError(MessageTemplate::kTooManyArguments),
JSBoundFunction);
}
// Determine the prototype of the {target_function}.
Handle<Object> prototype;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), prototype,
JSReceiver::GetPrototype(isolate(), target_function), JSBoundFunction);
// Create the [[BoundArguments]] for the result.
Handle<FixedArray> bound_arguments;
if (bound_args.length() == 0) {
bound_arguments = empty_fixed_array();
} else {
bound_arguments = NewFixedArray(bound_args.length());
for (int i = 0; i < bound_args.length(); ++i) {
bound_arguments->set(i, *bound_args[i]);
}
}
// Setup the map for the JSBoundFunction instance.
Handle<Map> map = target_function->IsConstructor()
? isolate()->bound_function_with_constructor_map()
: isolate()->bound_function_without_constructor_map();
if (map->prototype() != *prototype) {
map = Map::TransitionToPrototype(map, prototype, REGULAR_PROTOTYPE);
}
DCHECK_EQ(target_function->IsConstructor(), map->is_constructor());
// Setup the JSBoundFunction instance.
Handle<JSBoundFunction> result =
Handle<JSBoundFunction>::cast(NewJSObjectFromMap(map));
result->set_bound_target_function(*target_function);
result->set_bound_this(*bound_this);
result->set_bound_arguments(*bound_arguments);
return result;
}
// ES6 section 9.5.15 ProxyCreate (target, handler)
Handle<JSProxy> Factory::NewJSProxy(Handle<JSReceiver> target,
Handle<JSReceiver> handler) {
// Allocate the proxy object.
Handle<Map> map;
if (target->IsCallable()) {
if (target->IsConstructor()) {
map = Handle<Map>(isolate()->proxy_constructor_map());
} else {
map = Handle<Map>(isolate()->proxy_callable_map());
}
} else {
map = Handle<Map>(isolate()->proxy_map());
}
DCHECK(map->prototype()->IsNull(isolate()));
Handle<JSProxy> result = New<JSProxy>(map, NEW_SPACE);
result->initialize_properties();
result->set_target(*target);
result->set_handler(*handler);
result->set_hash(*undefined_value(), SKIP_WRITE_BARRIER);
return result;
}
Handle<JSGlobalProxy> Factory::NewUninitializedJSGlobalProxy(int size) {
// Create an empty shell of a JSGlobalProxy that needs to be reinitialized
// via ReinitializeJSGlobalProxy later.
Handle<Map> map = NewMap(JS_GLOBAL_PROXY_TYPE, size);
// Maintain invariant expected from any JSGlobalProxy.
map->set_is_access_check_needed(true);
CALL_HEAP_FUNCTION(
isolate(), isolate()->heap()->AllocateJSObjectFromMap(*map, NOT_TENURED),
JSGlobalProxy);
}
void Factory::ReinitializeJSGlobalProxy(Handle<JSGlobalProxy> object,
Handle<JSFunction> constructor) {
DCHECK(constructor->has_initial_map());
Handle<Map> map(constructor->initial_map(), isolate());
Handle<Map> old_map(object->map(), isolate());
// The proxy's hash should be retained across reinitialization.
Handle<Object> hash(object->hash(), isolate());
if (old_map->is_prototype_map()) {
map = Map::Copy(map, "CopyAsPrototypeForJSGlobalProxy");
map->set_is_prototype_map(true);
}
JSObject::NotifyMapChange(old_map, map, isolate());
old_map->NotifyLeafMapLayoutChange();
// Check that the already allocated object has the same size and type as
// objects allocated using the constructor.
DCHECK(map->instance_size() == old_map->instance_size());
DCHECK(map->instance_type() == old_map->instance_type());
// Allocate the backing storage for the properties.
Handle<FixedArray> properties = empty_fixed_array();
// In order to keep heap in consistent state there must be no allocations
// before object re-initialization is finished.
DisallowHeapAllocation no_allocation;
// Reset the map for the object.
object->synchronized_set_map(*map);
Heap* heap = isolate()->heap();
// Reinitialize the object from the constructor map.
heap->InitializeJSObjectFromMap(*object, *properties, *map);
// Restore the saved hash.
object->set_hash(*hash);
}
Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
Handle<String> name, FunctionKind kind, Handle<Code> code,
Handle<ScopeInfo> scope_info) {
DCHECK(IsValidFunctionKind(kind));
Handle<SharedFunctionInfo> shared =
NewSharedFunctionInfo(name, code, IsConstructable(kind));
shared->set_scope_info(*scope_info);
shared->set_outer_scope_info(*the_hole_value());
shared->set_kind(kind);
if (IsGeneratorFunction(kind)) {
shared->set_instance_class_name(isolate()->heap()->Generator_string());
}
return shared;
}
Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfoForLiteral(
FunctionLiteral* literal, Handle<Script> script) {
Handle<Code> code = isolate()->builtins()->CompileLazy();
Handle<ScopeInfo> scope_info(ScopeInfo::Empty(isolate()));
Handle<SharedFunctionInfo> result =
NewSharedFunctionInfo(literal->name(), literal->kind(), code, scope_info);
SharedFunctionInfo::InitFromFunctionLiteral(result, literal);
SharedFunctionInfo::SetScript(result, script);
return result;
}
Handle<JSMessageObject> Factory::NewJSMessageObject(
MessageTemplate::Template message, Handle<Object> argument,
int start_position, int end_position, Handle<Object> script,
Handle<Object> stack_frames) {
Handle<Map> map = message_object_map();
Handle<JSMessageObject> message_obj = New<JSMessageObject>(map, NEW_SPACE);
message_obj->set_properties(*empty_fixed_array(), SKIP_WRITE_BARRIER);
message_obj->initialize_elements();
message_obj->set_elements(*empty_fixed_array(), SKIP_WRITE_BARRIER);
message_obj->set_type(message);
message_obj->set_argument(*argument);
message_obj->set_start_position(start_position);
message_obj->set_end_position(end_position);
message_obj->set_script(*script);
message_obj->set_stack_frames(*stack_frames);
message_obj->set_error_level(v8::Isolate::kMessageError);
return message_obj;
}
Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
Handle<String> name, MaybeHandle<Code> maybe_code, bool is_constructor) {
// Function names are assumed to be flat elsewhere. Must flatten before
// allocating SharedFunctionInfo to avoid GC seeing the uninitialized SFI.
name = String::Flatten(name, TENURED);
Handle<Map> map = shared_function_info_map();
Handle<SharedFunctionInfo> share = New<SharedFunctionInfo>(map, OLD_SPACE);
// Set pointer fields.
share->set_name(*name);
share->set_function_data(*undefined_value(), SKIP_WRITE_BARRIER);
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
code = isolate()->builtins()->Illegal();
}
share->set_code(*code);
share->set_scope_info(ScopeInfo::Empty(isolate()));
share->set_outer_scope_info(*the_hole_value());
Handle<Code> construct_stub =
is_constructor ? isolate()->builtins()->JSConstructStubGeneric()
: isolate()->builtins()->ConstructedNonConstructable();
share->SetConstructStub(*construct_stub);
share->set_instance_class_name(*Object_string());
share->set_script(*undefined_value(), SKIP_WRITE_BARRIER);
share->set_debug_info(Smi::kZero, SKIP_WRITE_BARRIER);
share->set_function_identifier(*undefined_value(), SKIP_WRITE_BARRIER);
StaticFeedbackVectorSpec empty_spec;
Handle<FeedbackMetadata> feedback_metadata =
FeedbackMetadata::New(isolate(), &empty_spec);
share->set_feedback_metadata(*feedback_metadata, SKIP_WRITE_BARRIER);
share->set_function_literal_id(FunctionLiteral::kIdTypeInvalid);
#if V8_SFI_HAS_UNIQUE_ID
share->set_unique_id(isolate()->GetNextUniqueSharedFunctionInfoId());
#endif
share->set_profiler_ticks(0);
share->set_ast_node_count(0);
share->set_counters(0);
// Set integer fields (smi or int, depending on the architecture).
share->set_length(0);
share->set_internal_formal_parameter_count(0);
share->set_expected_nof_properties(0);
share->set_start_position_and_type(0);
share->set_end_position(0);
share->set_function_token_position(0);
// All compiler hints default to false or 0.
share->set_compiler_hints(0);
share->set_opt_count_and_bailout_reason(0);
// Link into the list.
Handle<Object> new_noscript_list =
WeakFixedArray::Add(noscript_shared_function_infos(), share);
isolate()->heap()->set_noscript_shared_function_infos(*new_noscript_list);
return share;
}
static inline int NumberCacheHash(Handle<FixedArray> cache,
Handle<Object> number) {
int mask = (cache->length() >> 1) - 1;
if (number->IsSmi()) {
return Handle<Smi>::cast(number)->value() & mask;
} else {
int64_t bits = bit_cast<int64_t>(number->Number());
return (static_cast<int>(bits) ^ static_cast<int>(bits >> 32)) & mask;
}
}
Handle<Object> Factory::GetNumberStringCache(Handle<Object> number) {
DisallowHeapAllocation no_gc;
int hash = NumberCacheHash(number_string_cache(), number);
Object* key = number_string_cache()->get(hash * 2);
if (key == *number || (key->IsHeapNumber() && number->IsHeapNumber() &&
key->Number() == number->Number())) {
return Handle<String>(
String::cast(number_string_cache()->get(hash * 2 + 1)), isolate());
}
return undefined_value();
}
void Factory::SetNumberStringCache(Handle<Object> number,
Handle<String> string) {
int hash = NumberCacheHash(number_string_cache(), number);
if (number_string_cache()->get(hash * 2) != *undefined_value()) {
int full_size = isolate()->heap()->FullSizeNumberStringCacheLength();
if (number_string_cache()->length() != full_size) {
Handle<FixedArray> new_cache = NewFixedArray(full_size, TENURED);
isolate()->heap()->set_number_string_cache(*new_cache);
return;
}
}
number_string_cache()->set(hash * 2, *number);
number_string_cache()->set(hash * 2 + 1, *string);
}
Handle<String> Factory::NumberToString(Handle<Object> number,
bool check_number_string_cache) {
isolate()->counters()->number_to_string_runtime()->Increment();
if (check_number_string_cache) {
Handle<Object> cached = GetNumberStringCache(number);
if (!cached->IsUndefined(isolate())) return Handle<String>::cast(cached);
}
char arr[100];
Vector<char> buffer(arr, arraysize(arr));
const char* str;
if (number->IsSmi()) {
int num = Handle<Smi>::cast(number)->value();
str = IntToCString(num, buffer);
} else {
double num = Handle<HeapNumber>::cast(number)->value();
str = DoubleToCString(num, buffer);
}
// We tenure the allocated string since it is referenced from the
// number-string cache which lives in the old space.
Handle<String> js_string = NewStringFromAsciiChecked(str, TENURED);
SetNumberStringCache(number, js_string);
return js_string;
}
Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
DCHECK(!shared->HasDebugInfo());
Heap* heap = isolate()->heap();
Handle<DebugInfo> debug_info =
Handle<DebugInfo>::cast(NewStruct(DEBUG_INFO_TYPE));
debug_info->set_flags(DebugInfo::kNone);
debug_info->set_shared(*shared);
debug_info->set_debugger_hints(shared->debugger_hints());
debug_info->set_debug_bytecode_array(heap->undefined_value());
debug_info->set_break_points(heap->empty_fixed_array());
// Link debug info to function.
shared->set_debug_info(*debug_info);
return debug_info;
}
Handle<BreakPointInfo> Factory::NewBreakPointInfo(int source_position) {
Handle<BreakPointInfo> new_break_point_info =
Handle<BreakPointInfo>::cast(NewStruct(TUPLE2_TYPE));
new_break_point_info->set_source_position(source_position);
new_break_point_info->set_break_point_objects(*undefined_value());
return new_break_point_info;
}
Handle<StackFrameInfo> Factory::NewStackFrameInfo() {
Handle<StackFrameInfo> stack_frame_info =
Handle<StackFrameInfo>::cast(NewStruct(STACK_FRAME_INFO_TYPE));
stack_frame_info->set_line_number(0);
stack_frame_info->set_column_number(0);
stack_frame_info->set_script_id(0);
stack_frame_info->set_script_name(Smi::kZero);
stack_frame_info->set_script_name_or_source_url(Smi::kZero);
stack_frame_info->set_function_name(Smi::kZero);
stack_frame_info->set_flag(0);
return stack_frame_info;
}
Handle<SourcePositionTableWithFrameCache>
Factory::NewSourcePositionTableWithFrameCache(
Handle<ByteArray> source_position_table,
Handle<UnseededNumberDictionary> stack_frame_cache) {
Handle<SourcePositionTableWithFrameCache>
source_position_table_with_frame_cache =
Handle<SourcePositionTableWithFrameCache>::cast(
NewStruct(TUPLE2_TYPE));
source_position_table_with_frame_cache->set_source_position_table(
*source_position_table);
source_position_table_with_frame_cache->set_stack_frame_cache(
*stack_frame_cache);
return source_position_table_with_frame_cache;
}
Handle<JSObject> Factory::NewArgumentsObject(Handle<JSFunction> callee,
int length) {
bool strict_mode_callee = is_strict(callee->shared()->language_mode()) ||
!callee->shared()->has_simple_parameters();
Handle<Map> map = strict_mode_callee ? isolate()->strict_arguments_map()
: isolate()->sloppy_arguments_map();
AllocationSiteUsageContext context(isolate(), Handle<AllocationSite>(),
false);
DCHECK(!isolate()->has_pending_exception());
Handle<JSObject> result = NewJSObjectFromMap(map);
Handle<Smi> value(Smi::FromInt(length), isolate());
Object::SetProperty(result, length_string(), value, STRICT).Assert();
if (!strict_mode_callee) {
Object::SetProperty(result, callee_string(), callee, STRICT).Assert();
}
return result;
}
Handle<JSWeakMap> Factory::NewJSWeakMap() {
// TODO(adamk): Currently the map is only created three times per
// isolate. If it's created more often, the map should be moved into the
// strong root list.
Handle<Map> map = NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize);
return Handle<JSWeakMap>::cast(NewJSObjectFromMap(map));
}
Handle<Map> Factory::ObjectLiteralMapFromCache(Handle<Context> native_context,
int number_of_properties) {
DCHECK(native_context->IsNativeContext());
const int kMapCacheSize = 128;
// We do not cache maps for too many properties or when running builtin code.
if (isolate()->bootstrapper()->IsActive()) {
return Map::Create(isolate(), number_of_properties);
}
// Use initial slow object proto map for too many properties.
if (number_of_properties > kMapCacheSize) {
return handle(native_context->slow_object_with_object_prototype_map(),
isolate());
}
if (number_of_properties == 0) {
// Reuse the initial map of the Object function if the literal has no
// predeclared properties.
return handle(native_context->object_function()->initial_map(), isolate());
}
int cache_index = number_of_properties - 1;
Handle<Object> maybe_cache(native_context->map_cache(), isolate());
if (maybe_cache->IsUndefined(isolate())) {
// Allocate the new map cache for the native context.
maybe_cache = NewFixedArray(kMapCacheSize, TENURED);
native_context->set_map_cache(*maybe_cache);
} else {
// Check to see whether there is a matching element in the cache.
Handle<FixedArray> cache = Handle<FixedArray>::cast(maybe_cache);
Object* result = cache->get(cache_index);
if (result->IsWeakCell()) {
WeakCell* cell = WeakCell::cast(result);
if (!cell->cleared()) {
Map* map = Map::cast(cell->value());
DCHECK(!map->is_dictionary_map());
return handle(map, isolate());
}
}
}
// Create a new map and add it to the cache.
Handle<FixedArray> cache = Handle<FixedArray>::cast(maybe_cache);
Handle<Map> map = Map::Create(isolate(), number_of_properties);
DCHECK(!map->is_dictionary_map());
Handle<WeakCell> cell = NewWeakCell(map);
cache->set(cache_index, *cell);
return map;
}
void Factory::SetRegExpAtomData(Handle<JSRegExp> regexp,
JSRegExp::Type type,
Handle<String> source,
JSRegExp::Flags flags,
Handle<Object> data) {
Handle<FixedArray> store = NewFixedArray(JSRegExp::kAtomDataSize);
store->set(JSRegExp::kTagIndex, Smi::FromInt(type));
store->set(JSRegExp::kSourceIndex, *source);
store->set(JSRegExp::kFlagsIndex, Smi::FromInt(flags));
store->set(JSRegExp::kAtomPatternIndex, *data);
regexp->set_data(*store);
}
void Factory::SetRegExpIrregexpData(Handle<JSRegExp> regexp,
JSRegExp::Type type,
Handle<String> source,
JSRegExp::Flags flags,
int capture_count) {
Handle<FixedArray> store = NewFixedArray(JSRegExp::kIrregexpDataSize);
Smi* uninitialized = Smi::FromInt(JSRegExp::kUninitializedValue);
store->set(JSRegExp::kTagIndex, Smi::FromInt(type));
store->set(JSRegExp::kSourceIndex, *source);
store->set(JSRegExp::kFlagsIndex, Smi::FromInt(flags));
store->set(JSRegExp::kIrregexpLatin1CodeIndex, uninitialized);
store->set(JSRegExp::kIrregexpUC16CodeIndex, uninitialized);
store->set(JSRegExp::kIrregexpLatin1CodeSavedIndex, uninitialized);
store->set(JSRegExp::kIrregexpUC16CodeSavedIndex, uninitialized);
store->set(JSRegExp::kIrregexpMaxRegisterCountIndex, Smi::kZero);
store->set(JSRegExp::kIrregexpCaptureCountIndex,
Smi::FromInt(capture_count));
store->set(JSRegExp::kIrregexpCaptureNameMapIndex, uninitialized);
regexp->set_data(*store);
}
Handle<RegExpMatchInfo> Factory::NewRegExpMatchInfo() {
// Initially, the last match info consists of all fixed fields plus space for
// the match itself (i.e., 2 capture indices).
static const int kInitialSize = RegExpMatchInfo::kFirstCaptureIndex +
RegExpMatchInfo::kInitialCaptureIndices;
Handle<FixedArray> elems = NewFixedArray(kInitialSize);
Handle<RegExpMatchInfo> result = Handle<RegExpMatchInfo>::cast(elems);
result->SetNumberOfCaptureRegisters(RegExpMatchInfo::kInitialCaptureIndices);
result->SetLastSubject(*empty_string());
result->SetLastInput(*undefined_value());
result->SetCapture(0, 0);
result->SetCapture(1, 0);
return result;
}
Handle<Object> Factory::GlobalConstantFor(Handle<Name> name) {
if (Name::Equals(name, undefined_string())) return undefined_value();
if (Name::Equals(name, nan_string())) return nan_value();
if (Name::Equals(name, infinity_string())) return infinity_value();
return Handle<Object>::null();
}
Handle<Object> Factory::ToBoolean(bool value) {
return value ? true_value() : false_value();
}
Handle<String> Factory::ToPrimitiveHintString(ToPrimitiveHint hint) {
switch (hint) {
case ToPrimitiveHint::kDefault:
return default_string();
case ToPrimitiveHint::kNumber:
return number_string();
case ToPrimitiveHint::kString:
return string_string();
}
UNREACHABLE();
}
Handle<Map> Factory::CreateSloppyFunctionMap(FunctionMode function_mode) {
Handle<Map> map = NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetFunctionInstanceDescriptor(map, function_mode);
map->set_is_constructor(IsFunctionModeWithPrototype(function_mode));
map->set_is_callable();
return map;
}
void Factory::SetFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode) {
int size = IsFunctionModeWithPrototype(function_mode) ? 5 : 4;
Map::EnsureDescriptorSlack(map, size);
PropertyAttributes ro_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
PropertyAttributes roc_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
STATIC_ASSERT(JSFunction::kLengthDescriptorIndex == 0);
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), roc_attribs);
{ // Add length.
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(length->name())), length, roc_attribs);
map->AppendDescriptor(&d);
}
STATIC_ASSERT(JSFunction::kNameDescriptorIndex == 1);
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), roc_attribs);
{ // Add name.
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(name->name())), name, roc_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> args =
Accessors::FunctionArgumentsInfo(isolate(), ro_attribs);
{ // Add arguments.
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(args->name())), args, ro_attribs);
map->AppendDescriptor(&d);
}
Handle<AccessorInfo> caller =
Accessors::FunctionCallerInfo(isolate(), ro_attribs);
{ // Add caller.
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(caller->name())), caller, ro_attribs);
map->AppendDescriptor(&d);
}
if (IsFunctionModeWithPrototype(function_mode)) {
if (function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE) {
ro_attribs = static_cast<PropertyAttributes>(ro_attribs & ~READ_ONLY);
}
Handle<AccessorInfo> prototype =
Accessors::FunctionPrototypeInfo(isolate(), ro_attribs);
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(prototype->name())), prototype, ro_attribs);
map->AppendDescriptor(&d);
}
}
Handle<Map> Factory::CreateStrictFunctionMap(
FunctionMode function_mode, Handle<JSFunction> empty_function) {
Handle<Map> map = NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetStrictFunctionInstanceDescriptor(map, function_mode);
map->set_is_constructor(IsFunctionModeWithPrototype(function_mode));
map->set_is_callable();
Map::SetPrototype(map, empty_function);
return map;
}
void Factory::SetStrictFunctionInstanceDescriptor(Handle<Map> map,
FunctionMode function_mode) {
int size = IsFunctionModeWithPrototype(function_mode) ? 3 : 2;
Map::EnsureDescriptorSlack(map, size);
PropertyAttributes rw_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
PropertyAttributes ro_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
PropertyAttributes roc_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
DCHECK(function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ||
function_mode == FUNCTION_WITH_READONLY_PROTOTYPE ||
function_mode == FUNCTION_WITHOUT_PROTOTYPE);
STATIC_ASSERT(JSFunction::kLengthDescriptorIndex == 0);
{ // Add length.
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), roc_attribs);
Descriptor d = Descriptor::AccessorConstant(
handle(Name::cast(length->name())), length, roc_attribs);
map->AppendDescriptor(&d);
}
STATIC_ASSERT(JSFunction::kNameDescriptorIndex == 1);
{ // Add name.
Handle<AccessorInfo> name =
Accessors::FunctionNameInfo(isolate(), roc_attribs);
Descriptor d = Descriptor::AccessorConstant(
handle(Name::cast(name->name())), name, roc_attribs);
map->AppendDescriptor(&d);
}
if (IsFunctionModeWithPrototype(function_mode)) {
// Add prototype.
PropertyAttributes attribs =
function_mode == FUNCTION_WITH_WRITEABLE_PROTOTYPE ? rw_attribs
: ro_attribs;
Handle<AccessorInfo> prototype =
Accessors::FunctionPrototypeInfo(isolate(), attribs);
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(prototype->name())), prototype, attribs);
map->AppendDescriptor(&d);
}
}
Handle<Map> Factory::CreateClassFunctionMap(Handle<JSFunction> empty_function) {
Handle<Map> map = NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
SetClassFunctionInstanceDescriptor(map);
map->set_is_constructor(true);
map->set_is_callable();
Map::SetPrototype(map, empty_function);
return map;
}
void Factory::SetClassFunctionInstanceDescriptor(Handle<Map> map) {
Map::EnsureDescriptorSlack(map, 2);
PropertyAttributes rw_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
PropertyAttributes roc_attribs =
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
STATIC_ASSERT(JSFunction::kLengthDescriptorIndex == 0);
{ // Add length.
Handle<AccessorInfo> length =
Accessors::FunctionLengthInfo(isolate(), roc_attribs);
Descriptor d = Descriptor::AccessorConstant(
handle(Name::cast(length->name())), length, roc_attribs);
map->AppendDescriptor(&d);
}
{
// Add prototype.
Handle<AccessorInfo> prototype =
Accessors::FunctionPrototypeInfo(isolate(), rw_attribs);
Descriptor d = Descriptor::AccessorConstant(
Handle<Name>(Name::cast(prototype->name())), prototype, rw_attribs);
map->AppendDescriptor(&d);
}
}
} // namespace internal
} // namespace v8
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