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chromium / v8 / v8 / 2ac522ab15061bdf93025a1f0d7dea82af9f9029 / . / src / factory.cc
blob: 4680e75204b30bf91770ab04333fa9fcdd7b94d0 [file] [log] [blame]
// 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/allocation-site-scopes.h"
#include "src/base/bits.h"
#include "src/conversions.h"
#include "src/isolate-inl.h"
#include "src/macro-assembler.h"
namespace v8 {
namespace internal {
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<Box> Factory::NewBox(Handle<Object> value) {
Handle<Box> result = Handle<Box>::cast(NewStruct(BOX_TYPE));
result->set_value(*value);
return result;
}
Handle<Oddball> Factory::NewOddball(Handle<Map> map,
const char* to_string,
Handle<Object> to_number,
byte kind) {
Handle<Oddball> oddball = New<Oddball>(map, OLD_POINTER_SPACE);
Oddball::Initialize(isolate(), oddball, to_string, to_number, kind);
return oddball;
}
Handle<FixedArray> Factory::NewFixedArray(int size, PretenureFlag pretenure) {
DCHECK(0 <= size);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateFixedArray(size, pretenure),
FixedArray);
}
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<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> double_array =
Handle<FixedDoubleArray>::cast(array);
for (int i = 0; i < size; ++i) {
double_array->set_the_hole(i);
}
}
return array;
}
Handle<ConstantPoolArray> Factory::NewConstantPoolArray(
const ConstantPoolArray::NumberOfEntries& small) {
DCHECK(small.total_count() > 0);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateConstantPoolArray(small),
ConstantPoolArray);
}
Handle<ConstantPoolArray> Factory::NewExtendedConstantPoolArray(
const ConstantPoolArray::NumberOfEntries& small,
const ConstantPoolArray::NumberOfEntries& extended) {
DCHECK(small.total_count() > 0);
DCHECK(extended.total_count() > 0);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateExtendedConstantPoolArray(small, extended),
ConstantPoolArray);
}
Handle<OrderedHashSet> Factory::NewOrderedHashSet() {
return OrderedHashSet::Allocate(isolate(), 4);
}
Handle<OrderedHashMap> Factory::NewOrderedHashMap() {
return OrderedHashMap::Allocate(isolate(), 4);
}
Handle<AccessorPair> Factory::NewAccessorPair() {
Handle<AccessorPair> accessors =
Handle<AccessorPair>::cast(NewStruct(ACCESSOR_PAIR_TYPE));
accessors->set_getter(*the_hole_value(), SKIP_WRITE_BARRIER);
accessors->set_setter(*the_hole_value(), SKIP_WRITE_BARRIER);
return accessors;
}
Handle<TypeFeedbackInfo> Factory::NewTypeFeedbackInfo() {
Handle<TypeFeedbackInfo> info =
Handle<TypeFeedbackInfo>::cast(NewStruct(TYPE_FEEDBACK_INFO_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);
}
// Internalized strings are created in the old generation (data space).
Handle<String> Factory::InternalizeString(Handle<String> string) {
if (string->IsInternalizedString()) return string;
return StringTable::LookupString(isolate(), string);
}
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 == 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 = 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::NewStringFromTwoByte(Vector<const uc16> string,
PretenureFlag pretenure) {
int length = string.length();
const uc16* start = string.start();
if (String::IsOneByte(start, length)) {
if (length == 1) return LookupSingleCharacterStringFromCode(string[0]);
Handle<SeqOneByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(),
result,
NewRawOneByteString(length, pretenure),
String);
CopyChars(result->GetChars(), start, length);
return result;
} else {
Handle<SeqTwoByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(),
result,
NewRawTwoByteString(length, pretenure),
String);
CopyChars(result->GetChars(), start, length);
return result;
}
}
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);
}
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>();
// Find the corresponding internalized string map for strings.
switch (string->map()->instance_type()) {
case STRING_TYPE: return internalized_string_map();
case ONE_BYTE_STRING_TYPE:
return one_byte_internalized_string_map();
case EXTERNAL_STRING_TYPE: return external_internalized_string_map();
case EXTERNAL_ONE_BYTE_STRING_TYPE:
return external_one_byte_internalized_string_map();
case EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE:
return external_internalized_string_with_one_byte_data_map();
case SHORT_EXTERNAL_STRING_TYPE:
return short_external_internalized_string_map();
case SHORT_EXTERNAL_ONE_BYTE_STRING_TYPE:
return short_external_one_byte_internalized_string_map();
case SHORT_EXTERNAL_STRING_WITH_ONE_BYTE_DATA_TYPE:
return short_external_internalized_string_with_one_byte_data_map();
default: return MaybeHandle<Map>(); // No match found.
}
}
MaybeHandle<SeqOneByteString> Factory::NewRawOneByteString(
int length, PretenureFlag pretenure) {
if (length > String::kMaxLength || length < 0) {
THROW_NEW_ERROR(isolate(), NewInvalidStringLengthError(), SeqOneByteString);
}
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);
}
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) {
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);
}
Handle<Map> map = (is_one_byte || is_one_byte_data_in_two_byte_string)
? cons_one_byte_string_map()
: cons_string_map();
Handle<ConsString> result = New<ConsString>(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::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();
}
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);
}
Handle<Map> 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);
}
// 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 = 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<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<Symbol> Factory::NewPrivateOwnSymbol() {
Handle<Symbol> symbol = NewSymbol();
symbol->set_is_private(true);
symbol->set_is_own(true);
return symbol;
}
Handle<Context> Factory::NewNativeContext() {
Handle<FixedArray> array = NewFixedArray(Context::NATIVE_CONTEXT_SLOTS);
array->set_map_no_write_barrier(*native_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_js_array_maps(*undefined_value());
DCHECK(context->IsNativeContext());
return context;
}
Handle<Context> Factory::NewScriptContext(Handle<JSFunction> function,
Handle<ScopeInfo> scope_info) {
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_global_object(function->context()->global_object());
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<ScopeInfo> scope_info) {
Handle<FixedArray> array =
NewFixedArray(scope_info->ContextLength(), TENURED);
array->set_map_no_write_barrier(*module_context_map());
// Instance link will be set later.
Handle<Context> context = Handle<Context>::cast(array);
context->set_extension(Smi::FromInt(0));
return context;
}
Handle<Context> Factory::NewFunctionContext(int length,
Handle<JSFunction> function) {
DCHECK(length >= Context::MIN_CONTEXT_SLOTS);
Handle<FixedArray> array = NewFixedArray(length);
array->set_map_no_write_barrier(*function_context_map());
Handle<Context> context = Handle<Context>::cast(array);
context->set_closure(*function);
context->set_previous(function->context());
context->set_extension(Smi::FromInt(0));
context->set_global_object(function->context()->global_object());
return context;
}
Handle<Context> Factory::NewCatchContext(Handle<JSFunction> function,
Handle<Context> previous,
Handle<String> name,
Handle<Object> thrown_object) {
STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == Context::THROWN_OBJECT_INDEX);
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(*name);
context->set_global_object(previous->global_object());
context->set(Context::THROWN_OBJECT_INDEX, *thrown_object);
return context;
}
Handle<Context> Factory::NewWithContext(Handle<JSFunction> function,
Handle<Context> previous,
Handle<JSReceiver> 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(*extension);
context->set_global_object(previous->global_object());
return context;
}
Handle<Context> Factory::NewBlockContext(Handle<JSFunction> function,
Handle<Context> previous,
Handle<ScopeInfo> scope_info) {
Handle<FixedArray> array =
NewFixedArrayWithHoles(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_global_object(previous->global_object());
return context;
}
Handle<Struct> Factory::NewStruct(InstanceType type) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateStruct(type),
Struct);
}
Handle<CodeCache> Factory::NewCodeCache() {
Handle<CodeCache> code_cache =
Handle<CodeCache>::cast(NewStruct(CODE_CACHE_TYPE));
code_cache->set_default_cache(*empty_fixed_array(), SKIP_WRITE_BARRIER);
code_cache->set_normal_type_cache(*undefined_value(), SKIP_WRITE_BARRIER);
code_cache->set_weak_cell_cache(*undefined_value(), SKIP_WRITE_BARRIER);
return code_cache;
}
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<DeclaredAccessorDescriptor> Factory::NewDeclaredAccessorDescriptor() {
return Handle<DeclaredAccessorDescriptor>::cast(
NewStruct(DECLARED_ACCESSOR_DESCRIPTOR_TYPE));
}
Handle<DeclaredAccessorInfo> Factory::NewDeclaredAccessorInfo() {
Handle<DeclaredAccessorInfo> info =
Handle<DeclaredAccessorInfo>::cast(
NewStruct(DECLARED_ACCESSOR_INFO_TYPE));
info->set_flag(0); // Must clear the flag, it was initialized as undefined.
return info;
}
Handle<ExecutableAccessorInfo> Factory::NewExecutableAccessorInfo() {
Handle<ExecutableAccessorInfo> info =
Handle<ExecutableAccessorInfo>::cast(
NewStruct(EXECUTABLE_ACCESSOR_INFO_TYPE));
info->set_flag(0); // Must clear the flag, it was initialized as undefined.
return info;
}
Handle<Script> Factory::NewScript(Handle<String> source) {
// Generate id for this script.
Heap* heap = isolate()->heap();
int id = heap->last_script_id()->value() + 1;
if (!Smi::IsValid(id) || id < 0) id = 1;
heap->set_last_script_id(Smi::FromInt(id));
// Create and initialize script object.
Handle<Script> script = Handle<Script>::cast(NewStruct(SCRIPT_TYPE));
script->set_source(*source);
script->set_name(heap->undefined_value());
script->set_id(Smi::FromInt(id));
script->set_line_offset(Smi::FromInt(0));
script->set_column_offset(Smi::FromInt(0));
script->set_context_data(heap->undefined_value());
script->set_type(Smi::FromInt(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_instructions_offset(Smi::FromInt(0));
script->set_flags(Smi::FromInt(0));
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<ExternalArray> Factory::NewExternalArray(int length,
ExternalArrayType array_type,
void* external_pointer,
PretenureFlag pretenure) {
DCHECK(0 <= length && length <= Smi::kMaxValue);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateExternalArray(length,
array_type,
external_pointer,
pretenure),
ExternalArray);
}
Handle<FixedTypedArrayBase> Factory::NewFixedTypedArray(
int length,
ExternalArrayType array_type,
PretenureFlag pretenure) {
DCHECK(0 <= length && length <= Smi::kMaxValue);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateFixedTypedArray(length,
array_type,
pretenure),
FixedTypedArrayBase);
}
Handle<Cell> Factory::NewCell(Handle<Object> value) {
AllowDeferredHandleDereference convert_to_cell;
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateCell(*value),
Cell);
}
Handle<PropertyCell> Factory::NewPropertyCellWithHole() {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocatePropertyCell(),
PropertyCell);
}
Handle<PropertyCell> Factory::NewPropertyCell(Handle<Object> value) {
AllowDeferredHandleDereference convert_to_cell;
Handle<PropertyCell> cell = NewPropertyCellWithHole();
PropertyCell::SetValueInferType(cell, value);
return cell;
}
Handle<WeakCell> Factory::NewWeakCell(Handle<HeapObject> value) {
AllowDeferredHandleDereference convert_to_cell;
CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateWeakCell(*value),
WeakCell);
}
Handle<AllocationSite> Factory::NewAllocationSite() {
Handle<Map> map = allocation_site_map();
Handle<AllocationSite> site = New<AllocationSite>(map, OLD_POINTER_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::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<ConstantPoolArray> Factory::CopyConstantPoolArray(
Handle<ConstantPoolArray> array) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyConstantPoolArray(*array),
ConstantPoolArray);
}
Handle<Object> Factory::NewNumber(double value,
PretenureFlag pretenure) {
// We need to distinguish the minus zero value and this cannot be
// done after conversion to int. Doing this by comparing bit
// patterns is faster than using fpclassify() et al.
if (IsMinusZero(value)) return NewHeapNumber(-0.0, IMMUTABLE, pretenure);
int int_value = FastD2I(value);
if (value == int_value && Smi::IsValid(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(double value,
MutableMode mode,
PretenureFlag pretenure) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateHeapNumber(value, mode, pretenure),
HeapNumber);
}
MaybeHandle<Object> Factory::NewTypeError(const char* message,
Vector<Handle<Object> > args) {
return NewError("MakeTypeError", message, args);
}
MaybeHandle<Object> Factory::NewTypeError(Handle<String> message) {
return NewError("$TypeError", message);
}
MaybeHandle<Object> Factory::NewRangeError(const char* message,
Vector<Handle<Object> > args) {
return NewError("MakeRangeError", message, args);
}
MaybeHandle<Object> Factory::NewRangeError(Handle<String> message) {
return NewError("$RangeError", message);
}
MaybeHandle<Object> Factory::NewSyntaxError(const char* message,
Handle<JSArray> args) {
return NewError("MakeSyntaxError", message, args);
}
MaybeHandle<Object> Factory::NewSyntaxError(Handle<String> message) {
return NewError("$SyntaxError", message);
}
MaybeHandle<Object> Factory::NewReferenceError(const char* message,
Vector<Handle<Object> > args) {
return NewError("MakeReferenceError", message, args);
}
MaybeHandle<Object> Factory::NewReferenceError(const char* message,
Handle<JSArray> args) {
return NewError("MakeReferenceError", message, args);
}
MaybeHandle<Object> Factory::NewReferenceError(Handle<String> message) {
return NewError("$ReferenceError", message);
}
MaybeHandle<Object> Factory::NewError(const char* maker, const char* message,
Vector<Handle<Object> > args) {
// Instantiate a closeable HandleScope for EscapeFrom.
v8::EscapableHandleScope scope(reinterpret_cast<v8::Isolate*>(isolate()));
Handle<FixedArray> array = NewFixedArray(args.length());
for (int i = 0; i < args.length(); i++) {
array->set(i, *args[i]);
}
Handle<JSArray> object = NewJSArrayWithElements(array);
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate(), result,
NewError(maker, message, object), Object);
return result.EscapeFrom(&scope);
}
MaybeHandle<Object> Factory::NewEvalError(const char* message,
Vector<Handle<Object> > args) {
return NewError("MakeEvalError", message, args);
}
MaybeHandle<Object> Factory::NewError(const char* message,
Vector<Handle<Object> > args) {
return NewError("MakeError", message, args);
}
Handle<String> Factory::EmergencyNewError(const char* message,
Handle<JSArray> args) {
const int kBufferSize = 1000;
char buffer[kBufferSize];
size_t space = kBufferSize;
char* p = &buffer[0];
Vector<char> v(buffer, kBufferSize);
StrNCpy(v, message, space);
space -= Min(space, strlen(message));
p = &buffer[kBufferSize] - space;
for (int i = 0; i < Smi::cast(args->length())->value(); i++) {
if (space > 0) {
*p++ = ' ';
space--;
if (space > 0) {
Handle<String> arg_str = Handle<String>::cast(
Object::GetElement(isolate(), args, i).ToHandleChecked());
SmartArrayPointer<char> arg = arg_str->ToCString();
Vector<char> v2(p, static_cast<int>(space));
StrNCpy(v2, arg.get(), space);
space -= Min(space, strlen(arg.get()));
p = &buffer[kBufferSize] - space;
}
}
}
if (space > 0) {
*p = '\0';
} else {
buffer[kBufferSize - 1] = '\0';
}
return NewStringFromUtf8(CStrVector(buffer), TENURED).ToHandleChecked();
}
MaybeHandle<Object> Factory::NewError(const char* maker, const char* message,
Handle<JSArray> args) {
Handle<String> make_str = InternalizeUtf8String(maker);
Handle<Object> fun_obj = Object::GetProperty(
isolate()->js_builtins_object(), make_str).ToHandleChecked();
// If the builtins haven't been properly configured yet this error
// constructor may not have been defined. Bail out.
if (!fun_obj->IsJSFunction()) {
return EmergencyNewError(message, args);
}
Handle<JSFunction> fun = Handle<JSFunction>::cast(fun_obj);
Handle<Object> message_obj = InternalizeUtf8String(message);
Handle<Object> argv[] = { message_obj, args };
// Invoke the JavaScript factory method. If an exception is thrown while
// running the factory method, use the exception as the result.
Handle<Object> result;
MaybeHandle<Object> exception;
if (!Execution::TryCall(fun,
isolate()->js_builtins_object(),
arraysize(argv),
argv,
&exception).ToHandle(&result)) {
return exception;
}
return result;
}
MaybeHandle<Object> Factory::NewError(Handle<String> message) {
return NewError("$Error", message);
}
MaybeHandle<Object> Factory::NewError(const char* constructor,
Handle<String> message) {
Handle<String> constr = InternalizeUtf8String(constructor);
Handle<JSFunction> fun = Handle<JSFunction>::cast(Object::GetProperty(
isolate()->js_builtins_object(), constr).ToHandleChecked());
Handle<Object> argv[] = { message };
// Invoke the JavaScript factory method. If an exception is thrown while
// running the factory method, use the exception as the result.
Handle<Object> result;
MaybeHandle<Object> exception;
if (!Execution::TryCall(fun,
isolate()->js_builtins_object(),
arraysize(argv),
argv,
&exception).ToHandle(&result)) {
return exception;
}
return result;
}
void Factory::InitializeFunction(Handle<JSFunction> function,
Handle<SharedFunctionInfo> info,
Handle<Context> context) {
function->initialize_properties();
function->initialize_elements();
function->set_shared(*info);
function->set_code(info->code());
function->set_context(*context);
function->set_prototype_or_initial_map(*the_hole_value());
function->set_literals_or_bindings(*empty_fixed_array());
function->set_next_function_link(*undefined_value());
}
Handle<JSFunction> Factory::NewFunction(Handle<Map> map,
Handle<SharedFunctionInfo> info,
Handle<Context> context,
PretenureFlag pretenure) {
AllocationSpace space = pretenure == TENURED ? OLD_POINTER_SPACE : NEW_SPACE;
Handle<JSFunction> result = New<JSFunction>(map, space);
InitializeFunction(result, info, context);
return result;
}
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);
DCHECK((info->strict_mode() == SLOPPY) &&
(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())));
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) {
return NewFunction(
isolate()->sloppy_function_without_prototype_map(), name, code);
}
Handle<JSFunction> Factory::NewFunction(Handle<String> name,
Handle<Code> code,
Handle<Object> prototype,
bool read_only_prototype) {
Handle<Map> map = read_only_prototype
? isolate()->sloppy_function_with_readonly_prototype_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 read_only_prototype,
bool install_constructor) {
// Allocate the function
Handle<JSFunction> function = NewFunction(
name, code, prototype, read_only_prototype);
ElementsKind elements_kind =
type == JS_ARRAY_TYPE ? FAST_SMI_ELEMENTS : FAST_HOLEY_SMI_ELEMENTS;
Handle<Map> initial_map = NewMap(type, instance_size, elements_kind);
if (!function->shared()->is_generator()) {
if (prototype->IsTheHole()) {
prototype = NewFunctionPrototype(function);
} else if (install_constructor) {
JSObject::AddProperty(Handle<JSObject>::cast(prototype),
constructor_string(), function, DONT_ENUM);
}
}
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 (function->shared()->is_generator()) {
// Generator 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 (!function->shared()->is_generator()) {
JSObject::AddProperty(prototype, constructor_string(), function, DONT_ENUM);
}
return prototype;
}
static bool ShouldOptimizeNewClosure(Isolate* isolate,
Handle<SharedFunctionInfo> info) {
return isolate->use_crankshaft() && !info->is_toplevel() &&
info->is_compiled() && info->allows_lazy_compilation() &&
!info->optimization_disabled() && !isolate->DebuggerHasBreakPoints();
}
Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
Handle<SharedFunctionInfo> info,
Handle<Context> context,
PretenureFlag pretenure) {
int map_index = Context::FunctionMapIndex(info->strict_mode(), info->kind());
Handle<Map> map(Map::cast(context->native_context()->get(map_index)));
Handle<JSFunction> result = NewFunction(map, info, context, pretenure);
if (info->ic_age() != isolate()->heap()->global_ic_age()) {
info->ResetForNewContext(isolate()->heap()->global_ic_age());
}
int index = info->SearchOptimizedCodeMap(context->native_context(),
BailoutId::None());
if (!info->bound() && index < 0) {
int number_of_literals = info->num_literals();
Handle<FixedArray> literals = NewFixedArray(number_of_literals, pretenure);
if (number_of_literals > 0) {
// Store the native context in the literals array prefix. This
// context will be used when creating object, regexp and array
// literals in this function.
literals->set(JSFunction::kLiteralNativeContextIndex,
context->native_context());
}
result->set_literals(*literals);
}
if (index > 0) {
// Caching of optimized code enabled and optimized code found.
FixedArray* literals = info->GetLiteralsFromOptimizedCodeMap(index);
if (literals != NULL) result->set_literals(literals);
Code* code = info->GetCodeFromOptimizedCodeMap(index);
DCHECK(!code->marked_for_deoptimization());
result->ReplaceCode(code);
return result;
}
if (FLAG_always_opt && ShouldOptimizeNewClosure(isolate(), info)) {
result->MarkForOptimization();
}
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<JSObject> Factory::NewExternal(void* value) {
Handle<Foreign> foreign = NewForeign(static_cast<Address>(value));
Handle<JSObject> external = NewJSObjectFromMap(external_map());
external->SetInternalField(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);
Handle<ConstantPoolArray> constant_pool =
desc.origin->NewConstantPool(isolate());
// Compute size.
int body_size = RoundUp(desc.instr_size, kObjectAlignment);
int obj_size = Code::SizeFor(body_size);
Handle<Code> code = NewCodeRaw(obj_size, immovable);
DCHECK(isolate()->code_range() == NULL ||
!isolate()->code_range()->valid() ||
isolate()->code_range()->contains(code->address()));
// 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_gc_metadata(Smi::FromInt(0));
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_raw_kind_specific_flags1(0);
code->set_raw_kind_specific_flags2(0);
code->set_is_crankshafted(crankshafted);
code->set_deoptimization_data(*empty_fixed_array(), SKIP_WRITE_BARRIER);
code->set_raw_type_feedback_info(Smi::FromInt(0));
code->set_next_code_link(*undefined_value());
code->set_handler_table(*empty_fixed_array(), SKIP_WRITE_BARRIER);
code->set_prologue_offset(prologue_offset);
if (code->kind() == Code::OPTIMIZED_FUNCTION) {
code->set_marked_for_deoptimization(false);
}
if (is_debug) {
DCHECK(code->kind() == Code::FUNCTION);
code->set_has_debug_break_slots(true);
}
desc.origin->PopulateConstantPool(*constant_pool);
code->set_constant_pool(*constant_pool);
// 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<Code> Factory::CopyCode(Handle<Code> code, Vector<byte> reloc_info) {
CALL_HEAP_FUNCTION(isolate(),
isolate()->heap()->CopyCode(*code, reloc_info),
Code);
}
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::NewJSObjectWithMemento(
Handle<JSFunction> constructor,
Handle<AllocationSite> site) {
JSFunction::EnsureHasInitialMap(constructor);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObject(*constructor, NOT_TENURED, *site),
JSObject);
}
Handle<JSModule> Factory::NewJSModule(Handle<Context> context,
Handle<ScopeInfo> scope_info) {
// Allocate a fresh map. Modules do not have a prototype.
Handle<Map> map = NewMap(JS_MODULE_TYPE, JSModule::kSize);
// Allocate the object based on the map.
Handle<JSModule> module =
Handle<JSModule>::cast(NewJSObjectFromMap(map, TENURED));
module->set_context(*context);
module->set_scope_info(*scope_info);
return module;
}
Handle<GlobalObject> Factory::NewGlobalObject(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->inobject_properties() == 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 = map->instance_type() == JS_GLOBAL_OBJECT_TYPE ? 64 : 512;
// Allocate a dictionary object for backing storage.
int at_least_space_for = map->NumberOfOwnDescriptors() * 2 + initial_size;
Handle<NameDictionary> dictionary =
NameDictionary::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);
DCHECK(details.type() == CALLBACKS); // Only accessors are expected.
PropertyDetails d = PropertyDetails(details.attributes(), CALLBACKS, i + 1);
Handle<Name> name(descs->GetKey(i));
Handle<Object> value(descs->GetCallbacksObject(i), isolate());
Handle<PropertyCell> cell = NewPropertyCell(value);
// |dictionary| already contains enough space for all properties.
USE(NameDictionary::Add(dictionary, name, cell, d));
}
// Allocate the global object and initialize it with the backing store.
Handle<GlobalObject> global = New<GlobalObject>(map, OLD_POINTER_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->IsGlobalObject() && !global->HasFastProperties());
return global;
}
Handle<JSObject> Factory::NewJSObjectFromMap(
Handle<Map> map,
PretenureFlag pretenure,
bool alloc_props,
Handle<AllocationSite> allocation_site) {
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObjectFromMap(
*map,
pretenure,
alloc_props,
allocation_site.is_null() ? NULL : *allocation_site),
JSObject);
}
Handle<JSArray> Factory::NewJSArray(ElementsKind elements_kind,
PretenureFlag pretenure) {
Context* native_context = isolate()->context()->native_context();
JSFunction* array_function = native_context->array_function();
Map* map = array_function->initial_map();
Map* transition_map = isolate()->get_initial_js_array_map(elements_kind);
if (transition_map != NULL) map = transition_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::FromInt(0));
array->set_elements(*empty_fixed_array());
return;
}
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<JSGeneratorObject> Factory::NewJSGeneratorObject(
Handle<JSFunction> function) {
DCHECK(function->shared()->is_generator());
JSFunction::EnsureHasInitialMap(function);
Handle<Map> map(function->initial_map());
DCHECK(map->instance_type() == JS_GENERATOR_OBJECT_TYPE);
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObjectFromMap(*map),
JSGeneratorObject);
}
Handle<JSArrayBuffer> Factory::NewJSArrayBuffer() {
Handle<JSFunction> array_buffer_fun(
isolate()->native_context()->array_buffer_fun());
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObject(*array_buffer_fun),
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<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);
}
namespace {
ElementsKind GetExternalArrayElementsKind(ExternalArrayType type) {
switch (type) {
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case kExternal##Type##Array: \
return EXTERNAL_##TYPE##_ELEMENTS;
TYPED_ARRAYS(TYPED_ARRAY_CASE)
}
UNREACHABLE();
return FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND;
#undef TYPED_ARRAY_CASE
}
size_t 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)
}
UNREACHABLE();
return 0;
#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();
return NULL;
}
}
void SetupArrayBufferView(i::Isolate* isolate,
i::Handle<i::JSArrayBufferView> obj,
i::Handle<i::JSArrayBuffer> buffer,
size_t byte_offset, size_t byte_length) {
DCHECK(byte_offset + byte_length <=
static_cast<size_t>(buffer->byte_length()->Number()));
obj->set_buffer(*buffer);
obj->set_weak_next(buffer->weak_first_view());
buffer->set_weak_first_view(*obj);
i::Handle<i::Object> byte_offset_object =
isolate->factory()->NewNumberFromSize(byte_offset);
obj->set_byte_offset(*byte_offset_object);
i::Handle<i::Object> byte_length_object =
isolate->factory()->NewNumberFromSize(byte_length);
obj->set_byte_length(*byte_length_object);
}
} // namespace
Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type) {
Handle<JSFunction> typed_array_fun_handle(GetTypedArrayFun(type, isolate()));
CALL_HEAP_FUNCTION(
isolate(),
isolate()->heap()->AllocateJSObject(*typed_array_fun_handle),
JSTypedArray);
}
Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type,
Handle<JSArrayBuffer> buffer,
size_t byte_offset,
size_t length) {
Handle<JSTypedArray> obj = NewJSTypedArray(type);
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);
Handle<Object> length_object = NewNumberFromSize(length);
obj->set_length(*length_object);
Handle<ExternalArray> elements = NewExternalArray(
static_cast<int>(length), type,
static_cast<uint8_t*>(buffer->backing_store()) + byte_offset);
Handle<Map> map = JSObject::GetElementsTransitionMap(obj, elements_kind);
JSObject::SetMapAndElements(obj, map, 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;
}
Handle<JSProxy> Factory::NewJSProxy(Handle<Object> handler,
Handle<Object> prototype) {
// Allocate map.
// TODO(rossberg): Once we optimize proxies, think about a scheme to share
// maps. Will probably depend on the identity of the handler object, too.
Handle<Map> map = NewMap(JS_PROXY_TYPE, JSProxy::kSize);
map->set_prototype(*prototype);
// Allocate the proxy object.
Handle<JSProxy> result = New<JSProxy>(map, NEW_SPACE);
result->InitializeBody(map->instance_size(), Smi::FromInt(0));
result->set_handler(*handler);
result->set_hash(*undefined_value(), SKIP_WRITE_BARRIER);
return result;
}
Handle<JSProxy> Factory::NewJSFunctionProxy(Handle<Object> handler,
Handle<Object> call_trap,
Handle<Object> construct_trap,
Handle<Object> prototype) {
// Allocate map.
// TODO(rossberg): Once we optimize proxies, think about a scheme to share
// maps. Will probably depend on the identity of the handler object, too.
Handle<Map> map = NewMap(JS_FUNCTION_PROXY_TYPE, JSFunctionProxy::kSize);
map->set_prototype(*prototype);
// Allocate the proxy object.
Handle<JSFunctionProxy> result = New<JSFunctionProxy>(map, NEW_SPACE);
result->InitializeBody(map->instance_size(), Smi::FromInt(0));
result->set_handler(*handler);
result->set_hash(*undefined_value(), SKIP_WRITE_BARRIER);
result->set_call_trap(*call_trap);
result->set_construct_trap(*construct_trap);
return result;
}
void Factory::ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type,
int size) {
DCHECK(type == JS_OBJECT_TYPE || type == JS_FUNCTION_TYPE);
// Allocate fresh map.
// TODO(rossberg): Once we optimize proxies, cache these maps.
Handle<Map> map = NewMap(type, size);
// Check that the receiver has at least the size of the fresh object.
int size_difference = proxy->map()->instance_size() - map->instance_size();
DCHECK(size_difference >= 0);
map->set_prototype(proxy->map()->prototype());
// Allocate the backing storage for the properties.
int prop_size = map->InitialPropertiesLength();
Handle<FixedArray> properties = NewFixedArray(prop_size, TENURED);
Heap* heap = isolate()->heap();
MaybeHandle<SharedFunctionInfo> shared;
if (type == JS_FUNCTION_TYPE) {
OneByteStringKey key(STATIC_CHAR_VECTOR("<freezing call trap>"),
heap->HashSeed());
Handle<String> name = InternalizeStringWithKey(&key);
shared = NewSharedFunctionInfo(name, MaybeHandle<Code>());
}
// In order to keep heap in consistent state there must be no allocations
// before object re-initialization is finished and filler object is installed.
DisallowHeapAllocation no_allocation;
// Put in filler if the new object is smaller than the old.
if (size_difference > 0) {
Address address = proxy->address();
heap->CreateFillerObjectAt(address + map->instance_size(), size_difference);
heap->AdjustLiveBytes(address, -size_difference, Heap::FROM_MUTATOR);
}
// Reset the map for the object.
proxy->synchronized_set_map(*map);
Handle<JSObject> jsobj = Handle<JSObject>::cast(proxy);
// Reinitialize the object from the constructor map.
heap->InitializeJSObjectFromMap(*jsobj, *properties, *map);
// The current native context is used to set up certain bits.
// TODO(adamk): Using the current context seems wrong, it should be whatever
// context the JSProxy originated in. But that context isn't stored anywhere.
Handle<Context> context(isolate()->native_context());
// Functions require some minimal initialization.
if (type == JS_FUNCTION_TYPE) {
map->set_function_with_prototype(true);
Handle<JSFunction> js_function = Handle<JSFunction>::cast(proxy);
InitializeFunction(js_function, shared.ToHandleChecked(), context);
} else {
// Provide JSObjects with a constructor.
map->set_constructor(context->object_function());
}
}
void Factory::ReinitializeJSGlobalProxy(Handle<JSGlobalProxy> object,
Handle<JSFunction> constructor) {
DCHECK(constructor->has_initial_map());
Handle<Map> map(constructor->initial_map(), isolate());
// The proxy's hash should be retained across reinitialization.
Handle<Object> hash(object->hash(), isolate());
// Check that the already allocated object has the same size and type as
// objects allocated using the constructor.
DCHECK(map->instance_size() == object->map()->instance_size());
DCHECK(map->instance_type() == object->map()->instance_type());
// Allocate the backing storage for the properties.
int prop_size = map->InitialPropertiesLength();
Handle<FixedArray> properties = NewFixedArray(prop_size, TENURED);
// 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);
}
void Factory::BecomeJSObject(Handle<JSProxy> proxy) {
ReinitializeJSProxy(proxy, JS_OBJECT_TYPE, JSObject::kHeaderSize);
}
void Factory::BecomeJSFunction(Handle<JSProxy> proxy) {
ReinitializeJSProxy(proxy, JS_FUNCTION_TYPE, JSFunction::kSize);
}
Handle<TypeFeedbackVector> Factory::NewTypeFeedbackVector(
const FeedbackVectorSpec& spec) {
return TypeFeedbackVector::Allocate(isolate(), spec);
}
Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
Handle<String> name, int number_of_literals, FunctionKind kind,
Handle<Code> code, Handle<ScopeInfo> scope_info,
Handle<TypeFeedbackVector> feedback_vector) {
DCHECK(IsValidFunctionKind(kind));
Handle<SharedFunctionInfo> shared = NewSharedFunctionInfo(name, code);
shared->set_scope_info(*scope_info);
shared->set_feedback_vector(*feedback_vector);
shared->set_kind(kind);
int literals_array_size = number_of_literals;
// If the function contains object, regexp or array literals,
// allocate extra space for a literals array prefix containing the
// context.
if (number_of_literals > 0) {
literals_array_size += JSFunction::kLiteralsPrefixSize;
}
shared->set_num_literals(literals_array_size);
if (IsGeneratorFunction(kind)) {
shared->set_instance_class_name(isolate()->heap()->Generator_string());
shared->DisableOptimization(kGenerator);
}
return shared;
}
Handle<JSMessageObject> Factory::NewJSMessageObject(
Handle<String> type,
Handle<JSArray> arguments,
int start_position,
int end_position,
Handle<Object> script,
Handle<Object> stack_frames) {
Handle<Map> map = message_object_map();
Handle<JSMessageObject> message = New<JSMessageObject>(map, NEW_SPACE);
message->set_properties(*empty_fixed_array(), SKIP_WRITE_BARRIER);
message->initialize_elements();
message->set_elements(*empty_fixed_array(), SKIP_WRITE_BARRIER);
message->set_type(*type);
message->set_arguments(*arguments);
message->set_start_position(start_position);
message->set_end_position(end_position);
message->set_script(*script);
message->set_stack_frames(*stack_frames);
return message;
}
Handle<SharedFunctionInfo> Factory::NewSharedFunctionInfo(
Handle<String> name,
MaybeHandle<Code> maybe_code) {
Handle<Map> map = shared_function_info_map();
Handle<SharedFunctionInfo> share = New<SharedFunctionInfo>(map,
OLD_POINTER_SPACE);
// Set pointer fields.
share->set_name(*name);
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
code = handle(isolate()->builtins()->builtin(Builtins::kIllegal));
}
share->set_code(*code);
share->set_optimized_code_map(Smi::FromInt(0));
share->set_scope_info(ScopeInfo::Empty(isolate()));
Code* construct_stub =
isolate()->builtins()->builtin(Builtins::kJSConstructStubGeneric);
share->set_construct_stub(construct_stub);
share->set_instance_class_name(*Object_string());
share->set_function_data(*undefined_value(), SKIP_WRITE_BARRIER);
share->set_script(*undefined_value(), SKIP_WRITE_BARRIER);
share->set_debug_info(*undefined_value(), SKIP_WRITE_BARRIER);
share->set_inferred_name(*empty_string(), SKIP_WRITE_BARRIER);
FeedbackVectorSpec empty_spec;
Handle<TypeFeedbackVector> feedback_vector =
NewTypeFeedbackVector(empty_spec);
share->set_feedback_vector(*feedback_vector, SKIP_WRITE_BARRIER);
#if TRACE_MAPS
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_formal_parameter_count(0);
share->set_expected_nof_properties(0);
share->set_num_literals(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);
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 {
DoubleRepresentation rep(number->Number());
return
(static_cast<int>(rep.bits) ^ static_cast<int>(rep.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) {
// The first time we have a hash collision, we move to the full sized
// number string cache. The idea is to have a small number string
// cache in the snapshot to keep boot-time memory usage down.
// If we expand the number string cache already while creating
// the snapshot then that didn't work out.
DCHECK(!isolate()->serializer_enabled() || FLAG_extra_code != NULL);
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()) 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) {
// Get the original code of the function.
Handle<Code> code(shared->code());
// Create a copy of the code before allocating the debug info object to avoid
// allocation while setting up the debug info object.
Handle<Code> original_code(*Factory::CopyCode(code));
// Allocate initial fixed array for active break points before allocating the
// debug info object to avoid allocation while setting up the debug info
// object.
Handle<FixedArray> break_points(
NewFixedArray(DebugInfo::kEstimatedNofBreakPointsInFunction));
// Create and set up the debug info object. Debug info contains function, a
// copy of the original code, the executing code and initial fixed array for
// active break points.
Handle<DebugInfo> debug_info =
Handle<DebugInfo>::cast(NewStruct(DEBUG_INFO_TYPE));
debug_info->set_shared(*shared);
debug_info->set_original_code(*original_code);
debug_info->set_code(*code);
debug_info->set_break_points(*break_points);
// Link debug info to function.
shared->set_debug_info(*debug_info);
return debug_info;
}
Handle<JSObject> Factory::NewArgumentsObject(Handle<JSFunction> callee,
int length) {
bool strict_mode_callee = callee->shared()->strict_mode() == STRICT;
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<JSFunction> Factory::CreateApiFunction(
Handle<FunctionTemplateInfo> obj,
Handle<Object> prototype,
ApiInstanceType instance_type) {
Handle<Code> code = isolate()->builtins()->HandleApiCall();
Handle<Code> construct_stub = isolate()->builtins()->JSConstructStubApi();
Handle<JSFunction> result;
if (obj->remove_prototype()) {
result = NewFunctionWithoutPrototype(empty_string(), code);
} else {
int internal_field_count = 0;
if (!obj->instance_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> instance_template =
Handle<ObjectTemplateInfo>(
ObjectTemplateInfo::cast(obj->instance_template()));
internal_field_count =
Smi::cast(instance_template->internal_field_count())->value();
}
// TODO(svenpanne) Kill ApiInstanceType and refactor things by generalizing
// JSObject::GetHeaderSize.
int instance_size = kPointerSize * internal_field_count;
InstanceType type;
switch (instance_type) {
case JavaScriptObjectType:
type = JS_OBJECT_TYPE;
instance_size += JSObject::kHeaderSize;
break;
case GlobalObjectType:
type = JS_GLOBAL_OBJECT_TYPE;
instance_size += JSGlobalObject::kSize;
break;
case GlobalProxyType:
type = JS_GLOBAL_PROXY_TYPE;
instance_size += JSGlobalProxy::kSize;
break;
default:
UNREACHABLE();
type = JS_OBJECT_TYPE; // Keep the compiler happy.
break;
}
result = NewFunction(empty_string(), code, prototype, type, instance_size,
obj->read_only_prototype(), true);
}
result->shared()->set_length(obj->length());
Handle<Object> class_name(obj->class_name(), isolate());
if (class_name->IsString()) {
result->shared()->set_instance_class_name(*class_name);
result->shared()->set_name(*class_name);
}
result->shared()->set_function_data(*obj);
result->shared()->set_construct_stub(*construct_stub);
result->shared()->DontAdaptArguments();
if (obj->remove_prototype()) {
DCHECK(result->shared()->IsApiFunction());
DCHECK(!result->has_initial_map());
DCHECK(!result->has_prototype());
return result;
}
#ifdef DEBUG
LookupIterator it(handle(JSObject::cast(result->prototype())),
constructor_string(), LookupIterator::OWN_SKIP_INTERCEPTOR);
MaybeHandle<Object> maybe_prop = Object::GetProperty(&it);
DCHECK(it.IsFound());
DCHECK(maybe_prop.ToHandleChecked().is_identical_to(result));
#endif
// Down from here is only valid for API functions that can be used as a
// constructor (don't set the "remove prototype" flag).
Handle<Map> map(result->initial_map());
// Mark as undetectable if needed.
if (obj->undetectable()) {
map->set_is_undetectable();
}
// Mark as hidden for the __proto__ accessor if needed.
if (obj->hidden_prototype()) {
map->set_is_hidden_prototype();
}
// Mark as needs_access_check if needed.
if (obj->needs_access_check()) {
map->set_is_access_check_needed(true);
}
// Set interceptor information in the map.
if (!obj->named_property_handler()->IsUndefined()) {
map->set_has_named_interceptor();
}
if (!obj->indexed_property_handler()->IsUndefined()) {
map->set_has_indexed_interceptor();
}
// Set instance call-as-function information in the map.
if (!obj->instance_call_handler()->IsUndefined()) {
map->set_has_instance_call_handler();
}
// Recursively copy parent instance templates' accessors,
// 'data' may be modified.
int max_number_of_additional_properties = 0;
int max_number_of_static_properties = 0;
FunctionTemplateInfo* info = *obj;
while (true) {
if (!info->instance_template()->IsUndefined()) {
Object* props =
ObjectTemplateInfo::cast(
info->instance_template())->property_accessors();
if (!props->IsUndefined()) {
Handle<Object> props_handle(props, isolate());
NeanderArray props_array(props_handle);
max_number_of_additional_properties += props_array.length();
}
}
if (!info->property_accessors()->IsUndefined()) {
Object* props = info->property_accessors();
if (!props->IsUndefined()) {
Handle<Object> props_handle(props, isolate());
NeanderArray props_array(props_handle);
max_number_of_static_properties += props_array.length();
}
}
Object* parent = info->parent_template();
if (parent->IsUndefined()) break;
info = FunctionTemplateInfo::cast(parent);
}
Map::EnsureDescriptorSlack(map, max_number_of_additional_properties);
// Use a temporary FixedArray to acculumate static accessors
int valid_descriptors = 0;
Handle<FixedArray> array;
if (max_number_of_static_properties > 0) {
array = NewFixedArray(max_number_of_static_properties);
}
while (true) {
// Install instance descriptors
if (!obj->instance_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> instance =
Handle<ObjectTemplateInfo>(
ObjectTemplateInfo::cast(obj->instance_template()), isolate());
Handle<Object> props = Handle<Object>(instance->property_accessors(),
isolate());
if (!props->IsUndefined()) {
Map::AppendCallbackDescriptors(map, props);
}
}
// Accumulate static accessors
if (!obj->property_accessors()->IsUndefined()) {
Handle<Object> props = Handle<Object>(obj->property_accessors(),
isolate());
valid_descriptors =
AccessorInfo::AppendUnique(props, array, valid_descriptors);
}
// Climb parent chain
Handle<Object> parent = Handle<Object>(obj->parent_template(), isolate());
if (parent->IsUndefined()) break;
obj = Handle<FunctionTemplateInfo>::cast(parent);
}
// Install accumulated static accessors
for (int i = 0; i < valid_descriptors; i++) {
Handle<AccessorInfo> accessor(AccessorInfo::cast(array->get(i)));
JSObject::SetAccessor(result, accessor).Assert();
}
DCHECK(result->shared()->IsApiFunction());
return result;
}
Handle<Map> Factory::ObjectLiteralMapFromCache(Handle<Context> context,
int number_of_properties,
bool* is_result_from_cache) {
const int kMapCacheSize = 128;
if (number_of_properties > kMapCacheSize) {
*is_result_from_cache = false;
return Map::Create(isolate(), number_of_properties);
}
*is_result_from_cache = true;
if (number_of_properties == 0) {
// Reuse the initial map of the Object function if the literal has no
// predeclared properties.
return handle(context->object_function()->initial_map(), isolate());
}
int cache_index = number_of_properties - 1;
if (context->map_cache()->IsUndefined()) {
// Allocate the new map cache for the native context.
Handle<FixedArray> new_cache = NewFixedArray(kMapCacheSize, TENURED);
context->set_map_cache(*new_cache);
}
// Check to see whether there is a matching element in the cache.
Handle<FixedArray> cache(FixedArray::cast(context->map_cache()));
{
Object* result = cache->get(cache_index);
if (result->IsWeakCell()) {
WeakCell* cell = WeakCell::cast(result);
if (!cell->cleared()) {
return handle(Map::cast(cell->value()), isolate());
}
}
}
// Create a new map and add it to the cache.
Handle<Map> map = Map::Create(isolate(), number_of_properties);
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.value()));
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.value()));
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::FromInt(0));
store->set(JSRegExp::kIrregexpCaptureCountIndex,
Smi::FromInt(capture_count));
regexp->set_data(*store);
}
MaybeHandle<FunctionTemplateInfo> Factory::ConfigureInstance(
Handle<FunctionTemplateInfo> desc, Handle<JSObject> instance) {
// Configure the instance by adding the properties specified by the
// instance template.
Handle<Object> instance_template(desc->instance_template(), isolate());
if (!instance_template->IsUndefined()) {
RETURN_ON_EXCEPTION(
isolate(),
Execution::ConfigureInstance(isolate(), instance, instance_template),
FunctionTemplateInfo);
}
return desc;
}
Handle<Object> Factory::GlobalConstantFor(Handle<String> name) {
if (String::Equals(name, undefined_string())) return undefined_value();
if (String::Equals(name, nan_string())) return nan_value();
if (String::Equals(name, infinity_string())) return infinity_value();
return Handle<Object>::null();
}
Handle<Object> Factory::ToBoolean(bool value) {
return value ? true_value() : false_value();
}
} } // namespace v8::internal