AuroraMiddleware/v8
1
0
Fork 0
Code Issues 2 Pull Requests Releases Wiki Activity
a5fa093d0b
v8/test/cctest/test-unboxed-doubles.cc
ishell 9633ebabd4 Remove slots that point to unboxed doubles from the StoreBuffer/SlotsBuffer. 
The problem is that tagged slot could become a double slot after migrating of an object to another map with "shifted" fields (for example as a result of generalizing immutable data property to a data field).
This CL also adds useful machinery that helps triggering incremental write barriers.

BUG=chromium:454297
LOG=Y

Review URL: https://codereview.chromium.org/957273002

Cr-Commit-Position: refs/heads/master@{#27054}
2015-03-06 23:55:13 +00:00

1534 lines
54 KiB
C++
Raw Blame History

// 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 <stdlib.h>
#include <utility>
#include "src/v8.h"
#include "src/compilation-cache.h"
#include "src/execution.h"
#include "src/factory.h"
#include "src/global-handles.h"
#include "src/ic/ic.h"
#include "src/macro-assembler.h"
#include "test/cctest/cctest.h"
using namespace v8::base;
using namespace v8::internal;
#if (V8_DOUBLE_FIELDS_UNBOXING)
//
// Helper functions.
//
static void InitializeVerifiedMapDescriptors(
Map* map, DescriptorArray* descriptors,
LayoutDescriptor* layout_descriptor) {
map->InitializeDescriptors(descriptors, layout_descriptor);
CHECK(layout_descriptor->IsConsistentWithMap(map));
}
static Handle<String> MakeString(const char* str) {
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
return factory->InternalizeUtf8String(str);
}
static Handle<String> MakeName(const char* str, int suffix) {
EmbeddedVector<char, 128> buffer;
SNPrintF(buffer, "%s%d", str, suffix);
return MakeString(buffer.start());
}
Handle<JSObject> GetObject(const char* name) {
return v8::Utils::OpenHandle(
*v8::Handle<v8::Object>::Cast(CcTest::global()->Get(v8_str(name))));
}
static double GetDoubleFieldValue(JSObject* obj, FieldIndex field_index) {
if (obj->IsUnboxedDoubleField(field_index)) {
return obj->RawFastDoublePropertyAt(field_index);
} else {
Object* value = obj->RawFastPropertyAt(field_index);
DCHECK(value->IsMutableHeapNumber());
return HeapNumber::cast(value)->value();
}
}
const int kNumberOfBits = 32;
enum TestPropertyKind {
PROP_CONSTANT,
PROP_SMI,
PROP_DOUBLE,
PROP_TAGGED,
PROP_KIND_NUMBER
};
static Representation representations[PROP_KIND_NUMBER] = {
Representation::None(), Representation::Smi(), Representation::Double(),
Representation::Tagged()};
static Handle<DescriptorArray> CreateDescriptorArray(Isolate* isolate,
TestPropertyKind* props,
int kPropsCount) {
Factory* factory = isolate->factory();
Handle<String> func_name = factory->InternalizeUtf8String("func");
Handle<JSFunction> func = factory->NewFunction(func_name);
Handle<DescriptorArray> descriptors =
DescriptorArray::Allocate(isolate, 0, kPropsCount);
int next_field_offset = 0;
for (int i = 0; i < kPropsCount; i++) {
EmbeddedVector<char, 64> buffer;
SNPrintF(buffer, "prop%d", i);
Handle<String> name = factory->InternalizeUtf8String(buffer.start());
TestPropertyKind kind = props[i];
if (kind == PROP_CONSTANT) {
DataConstantDescriptor d(name, func, NONE);
descriptors->Append(&d);
} else {
DataDescriptor f(name, next_field_offset, NONE, representations[kind]);
next_field_offset += f.GetDetails().field_width_in_words();
descriptors->Append(&f);
}
}
return descriptors;
}
TEST(LayoutDescriptorBasicFast) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
LayoutDescriptor* layout_desc = LayoutDescriptor::FastPointerLayout();
CHECK(!layout_desc->IsSlowLayout());
CHECK(layout_desc->IsFastPointerLayout());
CHECK_EQ(kSmiValueSize, layout_desc->capacity());
for (int i = 0; i < kSmiValueSize + 13; i++) {
CHECK_EQ(true, layout_desc->IsTagged(i));
}
CHECK_EQ(true, layout_desc->IsTagged(-1));
CHECK_EQ(true, layout_desc->IsTagged(-12347));
CHECK_EQ(true, layout_desc->IsTagged(15635));
CHECK(layout_desc->IsFastPointerLayout());
for (int i = 0; i < kSmiValueSize; i++) {
layout_desc = layout_desc->SetTaggedForTesting(i, false);
CHECK_EQ(false, layout_desc->IsTagged(i));
layout_desc = layout_desc->SetTaggedForTesting(i, true);
CHECK_EQ(true, layout_desc->IsTagged(i));
}
CHECK(layout_desc->IsFastPointerLayout());
int sequence_length;
CHECK_EQ(true, layout_desc->IsTagged(0, std::numeric_limits<int>::max(),
&sequence_length));
CHECK_EQ(std::numeric_limits<int>::max(), sequence_length);
CHECK_EQ(true, layout_desc->IsTagged(0, 7, &sequence_length));
CHECK_EQ(7, sequence_length);
}
TEST(LayoutDescriptorBasicSlow) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
// All properties tagged.
props[i] = PROP_TAGGED;
}
{
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
Handle<Map> map = Map::Create(isolate, kPropsCount);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_EQ(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
CHECK_EQ(kSmiValueSize, layout_descriptor->capacity());
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
props[0] = PROP_DOUBLE;
props[kPropsCount - 1] = PROP_DOUBLE;
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
{
int inobject_properties = kPropsCount - 1;
Handle<Map> map = Map::Create(isolate, inobject_properties);
// Should be fast as the only double property is the first one.
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_NE(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
CHECK(!layout_descriptor->IsSlowLayout());
CHECK(!layout_descriptor->IsFastPointerLayout());
CHECK_EQ(false, layout_descriptor->IsTagged(0));
for (int i = 1; i < kPropsCount; i++) {
CHECK_EQ(true, layout_descriptor->IsTagged(i));
}
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
{
int inobject_properties = kPropsCount;
Handle<Map> map = Map::Create(isolate, inobject_properties);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_NE(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
CHECK(layout_descriptor->IsSlowLayout());
CHECK(!layout_descriptor->IsFastPointerLayout());
CHECK(layout_descriptor->capacity() > kSmiValueSize);
CHECK_EQ(false, layout_descriptor->IsTagged(0));
CHECK_EQ(false, layout_descriptor->IsTagged(kPropsCount - 1));
for (int i = 1; i < kPropsCount - 1; i++) {
CHECK_EQ(true, layout_descriptor->IsTagged(i));
}
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
// Here we have truly slow layout descriptor, so play with the bits.
CHECK_EQ(true, layout_descriptor->IsTagged(-1));
CHECK_EQ(true, layout_descriptor->IsTagged(-12347));
CHECK_EQ(true, layout_descriptor->IsTagged(15635));
LayoutDescriptor* layout_desc = *layout_descriptor;
// Play with the bits but leave it in consistent state with map at the end.
for (int i = 1; i < kPropsCount - 1; i++) {
layout_desc = layout_desc->SetTaggedForTesting(i, false);
CHECK_EQ(false, layout_desc->IsTagged(i));
layout_desc = layout_desc->SetTaggedForTesting(i, true);
CHECK_EQ(true, layout_desc->IsTagged(i));
}
CHECK(layout_desc->IsSlowLayout());
CHECK(!layout_desc->IsFastPointerLayout());
CHECK(layout_descriptor->IsConsistentWithMap(*map));
}
}
static void TestLayoutDescriptorQueries(int layout_descriptor_length,
int* bit_flip_positions,
int max_sequence_length) {
Handle<LayoutDescriptor> layout_descriptor = LayoutDescriptor::NewForTesting(
CcTest::i_isolate(), layout_descriptor_length);
layout_descriptor_length = layout_descriptor->capacity();
LayoutDescriptor* layout_desc = *layout_descriptor;
{
// Fill in the layout descriptor.
int cur_bit_flip_index = 0;
bool tagged = true;
for (int i = 0; i < layout_descriptor_length; i++) {
if (i == bit_flip_positions[cur_bit_flip_index]) {
tagged = !tagged;
++cur_bit_flip_index;
CHECK(i < bit_flip_positions[cur_bit_flip_index]); // check test data
}
layout_desc = layout_desc->SetTaggedForTesting(i, tagged);
}
}
if (layout_desc->IsFastPointerLayout()) {
return;
}
{
// Check queries.
int cur_bit_flip_index = 0;
bool tagged = true;
for (int i = 0; i < layout_descriptor_length; i++) {
if (i == bit_flip_positions[cur_bit_flip_index]) {
tagged = !tagged;
++cur_bit_flip_index;
}
CHECK_EQ(tagged, layout_desc->IsTagged(i));
int next_bit_flip_position = bit_flip_positions[cur_bit_flip_index];
int expected_sequence_length;
if (next_bit_flip_position < layout_desc->capacity()) {
expected_sequence_length = next_bit_flip_position - i;
} else {
expected_sequence_length = tagged ? std::numeric_limits<int>::max()
: (layout_desc->capacity() - i);
}
expected_sequence_length =
Min(expected_sequence_length, max_sequence_length);
int sequence_length;
CHECK_EQ(tagged,
layout_desc->IsTagged(i, max_sequence_length, &sequence_length));
CHECK(sequence_length > 0);
CHECK_EQ(expected_sequence_length, sequence_length);
}
int sequence_length;
CHECK_EQ(true,
layout_desc->IsTagged(layout_descriptor_length,
max_sequence_length, &sequence_length));
CHECK_EQ(max_sequence_length, sequence_length);
}
}
static void TestLayoutDescriptorQueriesFast(int max_sequence_length) {
{
LayoutDescriptor* layout_desc = LayoutDescriptor::FastPointerLayout();
int sequence_length;
for (int i = 0; i < kNumberOfBits; i++) {
CHECK_EQ(true,
layout_desc->IsTagged(i, max_sequence_length, &sequence_length));
CHECK(sequence_length > 0);
CHECK_EQ(max_sequence_length, sequence_length);
}
}
{
int bit_flip_positions[] = {1000};
TestLayoutDescriptorQueries(kSmiValueSize, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[] = {0, 1000};
TestLayoutDescriptorQueries(kSmiValueSize, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[kNumberOfBits + 1];
for (int i = 0; i <= kNumberOfBits; i++) {
bit_flip_positions[i] = i;
}
TestLayoutDescriptorQueries(kSmiValueSize, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[] = {3, 7, 8, 10, 15, 21, 30, 1000};
TestLayoutDescriptorQueries(kSmiValueSize, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[] = {0, 1, 2, 3, 5, 7, 9,
12, 15, 18, 22, 26, 29, 1000};
TestLayoutDescriptorQueries(kSmiValueSize, bit_flip_positions,
max_sequence_length);
}
}
TEST(LayoutDescriptorQueriesFastLimited7) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesFast(7);
}
TEST(LayoutDescriptorQueriesFastLimited13) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesFast(13);
}
TEST(LayoutDescriptorQueriesFastUnlimited) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesFast(std::numeric_limits<int>::max());
}
static void TestLayoutDescriptorQueriesSlow(int max_sequence_length) {
{
int bit_flip_positions[] = {10000};
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[] = {0, 10000};
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[kMaxNumberOfDescriptors + 1];
for (int i = 0; i < kMaxNumberOfDescriptors; i++) {
bit_flip_positions[i] = i;
}
bit_flip_positions[kMaxNumberOfDescriptors] = 10000;
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[] = {3, 7, 8, 10, 15, 21, 30,
37, 54, 80, 99, 383, 10000};
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[] = {0, 10, 20, 30, 50, 70, 90,
120, 150, 180, 220, 260, 290, 10000};
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[kMaxNumberOfDescriptors + 1];
int cur = 0;
for (int i = 0; i < kMaxNumberOfDescriptors; i++) {
bit_flip_positions[i] = cur;
cur = (cur + 1) * 2;
}
CHECK(cur < 10000);
bit_flip_positions[kMaxNumberOfDescriptors] = 10000;
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
{
int bit_flip_positions[kMaxNumberOfDescriptors + 1];
int cur = 3;
for (int i = 0; i < kMaxNumberOfDescriptors; i++) {
bit_flip_positions[i] = cur;
cur = (cur + 1) * 2;
}
CHECK(cur < 10000);
bit_flip_positions[kMaxNumberOfDescriptors] = 10000;
TestLayoutDescriptorQueries(kMaxNumberOfDescriptors, bit_flip_positions,
max_sequence_length);
}
}
TEST(LayoutDescriptorQueriesSlowLimited7) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesSlow(7);
}
TEST(LayoutDescriptorQueriesSlowLimited13) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesSlow(13);
}
TEST(LayoutDescriptorQueriesSlowLimited42) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesSlow(42);
}
TEST(LayoutDescriptorQueriesSlowUnlimited) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
TestLayoutDescriptorQueriesSlow(std::numeric_limits<int>::max());
}
TEST(LayoutDescriptorCreateNewFast) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
TestPropertyKind props[] = {
PROP_CONSTANT,
PROP_TAGGED, // field #0
PROP_CONSTANT,
PROP_DOUBLE, // field #1
PROP_CONSTANT,
PROP_TAGGED, // field #2
PROP_CONSTANT,
};
const int kPropsCount = arraysize(props);
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
{
Handle<Map> map = Map::Create(isolate, 0);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_EQ(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
{
Handle<Map> map = Map::Create(isolate, 1);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_EQ(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
{
Handle<Map> map = Map::Create(isolate, 2);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_NE(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
CHECK(!layout_descriptor->IsSlowLayout());
CHECK_EQ(true, layout_descriptor->IsTagged(0));
CHECK_EQ(false, layout_descriptor->IsTagged(1));
CHECK_EQ(true, layout_descriptor->IsTagged(2));
CHECK_EQ(true, layout_descriptor->IsTagged(125));
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
}
TEST(LayoutDescriptorCreateNewSlow) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = static_cast<TestPropertyKind>(i % PROP_KIND_NUMBER);
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
{
Handle<Map> map = Map::Create(isolate, 0);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_EQ(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
{
Handle<Map> map = Map::Create(isolate, 1);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_EQ(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
{
Handle<Map> map = Map::Create(isolate, 2);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_NE(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
CHECK(!layout_descriptor->IsSlowLayout());
CHECK_EQ(true, layout_descriptor->IsTagged(0));
CHECK_EQ(false, layout_descriptor->IsTagged(1));
CHECK_EQ(true, layout_descriptor->IsTagged(2));
CHECK_EQ(true, layout_descriptor->IsTagged(125));
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
}
{
int inobject_properties = kPropsCount / 2;
Handle<Map> map = Map::Create(isolate, inobject_properties);
layout_descriptor = LayoutDescriptor::New(map, descriptors, kPropsCount);
CHECK_NE(LayoutDescriptor::FastPointerLayout(), *layout_descriptor);
CHECK(layout_descriptor->IsSlowLayout());
for (int i = 0; i < inobject_properties; i++) {
// PROP_DOUBLE has index 1 among DATA properties.
const bool tagged = (i % (PROP_KIND_NUMBER - 1)) != 1;
CHECK_EQ(tagged, layout_descriptor->IsTagged(i));
}
// Every property after inobject_properties must be tagged.
for (int i = inobject_properties; i < kPropsCount; i++) {
CHECK_EQ(true, layout_descriptor->IsTagged(i));
}
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
// Now test LayoutDescriptor::cast_gc_safe().
Handle<LayoutDescriptor> layout_descriptor_copy =
LayoutDescriptor::New(map, descriptors, kPropsCount);
LayoutDescriptor* layout_desc = *layout_descriptor;
CHECK_EQ(layout_desc, LayoutDescriptor::cast(layout_desc));
CHECK_EQ(layout_desc, LayoutDescriptor::cast_gc_safe(layout_desc));
CHECK(layout_descriptor->IsFixedTypedArrayBase());
// Now make it look like a forwarding pointer to layout_descriptor_copy.
MapWord map_word = layout_desc->map_word();
CHECK(!map_word.IsForwardingAddress());
layout_desc->set_map_word(
MapWord::FromForwardingAddress(*layout_descriptor_copy));
CHECK(layout_desc->map_word().IsForwardingAddress());
CHECK_EQ(*layout_descriptor_copy,
LayoutDescriptor::cast_gc_safe(layout_desc));
// Restore it back.
layout_desc->set_map_word(map_word);
CHECK_EQ(layout_desc, LayoutDescriptor::cast(layout_desc));
}
}
static Handle<LayoutDescriptor> TestLayoutDescriptorAppend(
Isolate* isolate, int inobject_properties, TestPropertyKind* props,
int kPropsCount) {
Factory* factory = isolate->factory();
Handle<String> func_name = factory->InternalizeUtf8String("func");
Handle<JSFunction> func = factory->NewFunction(func_name);
Handle<DescriptorArray> descriptors =
DescriptorArray::Allocate(isolate, 0, kPropsCount);
Handle<Map> map = Map::Create(isolate, inobject_properties);
map->InitializeDescriptors(*descriptors,
LayoutDescriptor::FastPointerLayout());
int next_field_offset = 0;
for (int i = 0; i < kPropsCount; i++) {
EmbeddedVector<char, 64> buffer;
SNPrintF(buffer, "prop%d", i);
Handle<String> name = factory->InternalizeUtf8String(buffer.start());
Handle<LayoutDescriptor> layout_descriptor;
TestPropertyKind kind = props[i];
if (kind == PROP_CONSTANT) {
DataConstantDescriptor d(name, func, NONE);
layout_descriptor = LayoutDescriptor::ShareAppend(map, d.GetDetails());
descriptors->Append(&d);
} else {
DataDescriptor f(name, next_field_offset, NONE, representations[kind]);
int field_width_in_words = f.GetDetails().field_width_in_words();
next_field_offset += field_width_in_words;
layout_descriptor = LayoutDescriptor::ShareAppend(map, f.GetDetails());
descriptors->Append(&f);
int field_index = f.GetDetails().field_index();
bool is_inobject = field_index < map->inobject_properties();
for (int bit = 0; bit < field_width_in_words; bit++) {
CHECK_EQ(is_inobject && (kind == PROP_DOUBLE),
!layout_descriptor->IsTagged(field_index + bit));
}
CHECK(layout_descriptor->IsTagged(next_field_offset));
}
map->InitializeDescriptors(*descriptors, *layout_descriptor);
}
Handle<LayoutDescriptor> layout_descriptor(map->layout_descriptor(), isolate);
CHECK(layout_descriptor->IsConsistentWithMap(*map));
return layout_descriptor;
}
TEST(LayoutDescriptorAppend) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = static_cast<TestPropertyKind>(i % PROP_KIND_NUMBER);
}
layout_descriptor =
TestLayoutDescriptorAppend(isolate, 0, props, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor =
TestLayoutDescriptorAppend(isolate, 13, props, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor =
TestLayoutDescriptorAppend(isolate, kSmiValueSize, props, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppend(isolate, kSmiValueSize * 2,
props, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
layout_descriptor =
TestLayoutDescriptorAppend(isolate, kPropsCount, props, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
}
TEST(LayoutDescriptorAppendAllDoubles) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = PROP_DOUBLE;
}
layout_descriptor =
TestLayoutDescriptorAppend(isolate, 0, props, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor =
TestLayoutDescriptorAppend(isolate, 13, props, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor =
TestLayoutDescriptorAppend(isolate, kSmiValueSize, props, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppend(isolate, kSmiValueSize + 1,
props, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppend(isolate, kSmiValueSize * 2,
props, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
layout_descriptor =
TestLayoutDescriptorAppend(isolate, kPropsCount, props, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
{
// Ensure layout descriptor switches into slow mode at the right moment.
layout_descriptor =
TestLayoutDescriptorAppend(isolate, kPropsCount, props, kSmiValueSize);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppend(isolate, kPropsCount, props,
kSmiValueSize + 1);
CHECK(layout_descriptor->IsSlowLayout());
}
}
static Handle<LayoutDescriptor> TestLayoutDescriptorAppendIfFastOrUseFull(
Isolate* isolate, int inobject_properties,
Handle<DescriptorArray> descriptors, int number_of_descriptors) {
Handle<Map> map = Map::Create(isolate, inobject_properties);
Handle<LayoutDescriptor> full_layout_descriptor = LayoutDescriptor::New(
map, descriptors, descriptors->number_of_descriptors());
int nof = 0;
bool switched_to_slow_mode = false;
for (int i = 0; i < number_of_descriptors; i++) {
PropertyDetails details = descriptors->GetDetails(i);
// This method calls LayoutDescriptor::AppendIfFastOrUseFull() internally
// and does all the required map-descriptors related book keeping.
map = Map::CopyInstallDescriptorsForTesting(map, i, descriptors,
full_layout_descriptor);
LayoutDescriptor* layout_desc = map->layout_descriptor();
if (layout_desc->IsSlowLayout()) {
switched_to_slow_mode = true;
CHECK_EQ(*full_layout_descriptor, layout_desc);
} else {
CHECK(!switched_to_slow_mode);
if (details.type() == DATA) {
nof++;
int field_index = details.field_index();
int field_width_in_words = details.field_width_in_words();
bool is_inobject = field_index < map->inobject_properties();
for (int bit = 0; bit < field_width_in_words; bit++) {
CHECK_EQ(is_inobject && details.representation().IsDouble(),
!layout_desc->IsTagged(field_index + bit));
}
CHECK(layout_desc->IsTagged(field_index + field_width_in_words));
}
}
CHECK(map->layout_descriptor()->IsConsistentWithMap(*map));
}
Handle<LayoutDescriptor> layout_descriptor(map->GetLayoutDescriptor(),
isolate);
CHECK(layout_descriptor->IsConsistentWithMap(*map));
return layout_descriptor;
}
TEST(LayoutDescriptorAppendIfFastOrUseFull) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = static_cast<TestPropertyKind>(i % PROP_KIND_NUMBER);
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, 0, descriptors, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, 13, descriptors, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kSmiValueSize, descriptors, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kSmiValueSize * 2, descriptors, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kPropsCount, descriptors, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
}
TEST(LayoutDescriptorAppendIfFastOrUseFullAllDoubles) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = PROP_DOUBLE;
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, 0, descriptors, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, 13, descriptors, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kSmiValueSize, descriptors, kPropsCount);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kSmiValueSize + 1, descriptors, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kSmiValueSize * 2, descriptors, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kPropsCount, descriptors, kPropsCount);
CHECK(layout_descriptor->IsSlowLayout());
{
// Ensure layout descriptor switches into slow mode at the right moment.
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kPropsCount, descriptors, kSmiValueSize);
CHECK(!layout_descriptor->IsSlowLayout());
layout_descriptor = TestLayoutDescriptorAppendIfFastOrUseFull(
isolate, kPropsCount, descriptors, kSmiValueSize + 1);
CHECK(layout_descriptor->IsSlowLayout());
}
}
TEST(Regress436816) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
v8::HandleScope scope(CcTest::isolate());
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = PROP_DOUBLE;
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
Handle<Map> map = Map::Create(isolate, kPropsCount);
Handle<LayoutDescriptor> layout_descriptor =
LayoutDescriptor::New(map, descriptors, kPropsCount);
map->InitializeDescriptors(*descriptors, *layout_descriptor);
Handle<JSObject> object = factory->NewJSObjectFromMap(map, TENURED);
Address fake_address = reinterpret_cast<Address>(~kHeapObjectTagMask);
HeapObject* fake_object = HeapObject::FromAddress(fake_address);
CHECK(fake_object->IsHeapObject());
double boom_value = bit_cast<double>(fake_object);
for (int i = 0; i < kPropsCount; i++) {
FieldIndex index = FieldIndex::ForDescriptor(*map, i);
CHECK(map->IsUnboxedDoubleField(index));
object->RawFastDoublePropertyAtPut(index, boom_value);
}
CHECK(object->HasFastProperties());
CHECK(!object->map()->HasFastPointerLayout());
Handle<Map> normalized_map =
Map::Normalize(map, KEEP_INOBJECT_PROPERTIES, "testing");
JSObject::MigrateToMap(object, normalized_map);
CHECK(!object->HasFastProperties());
CHECK(object->map()->HasFastPointerLayout());
// Trigger GCs and heap verification.
CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
}
TEST(DoScavenge) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
v8::HandleScope scope(CcTest::isolate());
CompileRun(
"function A() {"
" this.x = 42.5;"
" this.o = {};"
"};"
"var o = new A();");
Handle<String> obj_name = factory->InternalizeUtf8String("o");
Handle<Object> obj_value =
Object::GetProperty(isolate->global_object(), obj_name).ToHandleChecked();
CHECK(obj_value->IsJSObject());
Handle<JSObject> obj = Handle<JSObject>::cast(obj_value);
{
// Ensure the object is properly set up.
Map* map = obj->map();
DescriptorArray* descriptors = map->instance_descriptors();
CHECK(map->NumberOfOwnDescriptors() == 2);
CHECK(descriptors->GetDetails(0).representation().IsDouble());
CHECK(descriptors->GetDetails(1).representation().IsHeapObject());
FieldIndex field_index = FieldIndex::ForDescriptor(map, 0);
CHECK(field_index.is_inobject() && field_index.is_double());
CHECK_EQ(FLAG_unbox_double_fields, map->IsUnboxedDoubleField(field_index));
CHECK_EQ(42.5, GetDoubleFieldValue(*obj, field_index));
}
CHECK(isolate->heap()->new_space()->Contains(*obj));
// Trigger GCs so that the newly allocated object moves to old gen.
CcTest::heap()->CollectGarbage(i::NEW_SPACE); // in survivor space now
// Create temp object in the new space.
Handle<JSArray> temp = factory->NewJSArray(FAST_ELEMENTS, NOT_TENURED);
CHECK(isolate->heap()->new_space()->Contains(*temp));
// Construct a double value that looks like a pointer to the new space object
// and store it into the obj.
Address fake_object = reinterpret_cast<Address>(*temp) + kPointerSize;
double boom_value = bit_cast<double>(fake_object);
FieldIndex field_index = FieldIndex::ForDescriptor(obj->map(), 0);
Handle<HeapNumber> boom_number = factory->NewHeapNumber(boom_value, MUTABLE);
obj->FastPropertyAtPut(field_index, *boom_number);
// Now the object moves to old gen and it has a double field that looks like
// a pointer to a from semi-space.
CcTest::heap()->CollectGarbage(i::NEW_SPACE); // in old gen now
CHECK(isolate->heap()->old_pointer_space()->Contains(*obj));
CHECK_EQ(boom_value, GetDoubleFieldValue(*obj, field_index));
}
static void TestLayoutDescriptorHelper(Isolate* isolate,
int inobject_properties,
Handle<DescriptorArray> descriptors,
int number_of_descriptors) {
Handle<Map> map = Map::Create(isolate, inobject_properties);
Handle<LayoutDescriptor> layout_descriptor = LayoutDescriptor::New(
map, descriptors, descriptors->number_of_descriptors());
InitializeVerifiedMapDescriptors(*map, *descriptors, *layout_descriptor);
LayoutDescriptorHelper helper(*map);
bool all_fields_tagged = true;
int instance_size = map->instance_size();
int end_offset = instance_size * 2;
int first_non_tagged_field_offset = end_offset;
for (int i = 0; i < number_of_descriptors; i++) {
PropertyDetails details = descriptors->GetDetails(i);
if (details.type() != DATA) continue;
FieldIndex index = FieldIndex::ForDescriptor(*map, i);
if (!index.is_inobject()) continue;
all_fields_tagged &= !details.representation().IsDouble();
bool expected_tagged = !index.is_double();
if (!expected_tagged) {
first_non_tagged_field_offset =
Min(first_non_tagged_field_offset, index.offset());
}
int end_of_region_offset;
CHECK_EQ(expected_tagged, helper.IsTagged(index.offset()));
CHECK_EQ(expected_tagged, helper.IsTagged(index.offset(), instance_size,
&end_of_region_offset));
CHECK(end_of_region_offset > 0);
CHECK(end_of_region_offset % kPointerSize == 0);
CHECK(end_of_region_offset <= instance_size);
for (int offset = index.offset(); offset < end_of_region_offset;
offset += kPointerSize) {
CHECK_EQ(expected_tagged, helper.IsTagged(index.offset()));
}
if (end_of_region_offset < instance_size) {
CHECK_EQ(!expected_tagged, helper.IsTagged(end_of_region_offset));
} else {
CHECK_EQ(true, helper.IsTagged(end_of_region_offset));
}
}
for (int offset = 0; offset < JSObject::kHeaderSize; offset += kPointerSize) {
// Header queries
CHECK_EQ(true, helper.IsTagged(offset));
int end_of_region_offset;
CHECK_EQ(true, helper.IsTagged(offset, end_offset, &end_of_region_offset));
CHECK_EQ(first_non_tagged_field_offset, end_of_region_offset);
// Out of bounds queries
CHECK_EQ(true, helper.IsTagged(offset + instance_size));
}
CHECK_EQ(all_fields_tagged, helper.all_fields_tagged());
}
TEST(LayoutDescriptorHelperMixed) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = static_cast<TestPropertyKind>(i % PROP_KIND_NUMBER);
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
TestLayoutDescriptorHelper(isolate, 0, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, 13, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, kSmiValueSize, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, kSmiValueSize * 2, descriptors,
kPropsCount);
TestLayoutDescriptorHelper(isolate, kPropsCount, descriptors, kPropsCount);
}
TEST(LayoutDescriptorHelperAllTagged) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = PROP_TAGGED;
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
TestLayoutDescriptorHelper(isolate, 0, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, 13, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, kSmiValueSize, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, kSmiValueSize * 2, descriptors,
kPropsCount);
TestLayoutDescriptorHelper(isolate, kPropsCount, descriptors, kPropsCount);
}
TEST(LayoutDescriptorHelperAllDoubles) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<LayoutDescriptor> layout_descriptor;
const int kPropsCount = kSmiValueSize * 3;
TestPropertyKind props[kPropsCount];
for (int i = 0; i < kPropsCount; i++) {
props[i] = PROP_DOUBLE;
}
Handle<DescriptorArray> descriptors =
CreateDescriptorArray(isolate, props, kPropsCount);
TestLayoutDescriptorHelper(isolate, 0, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, 13, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, kSmiValueSize, descriptors, kPropsCount);
TestLayoutDescriptorHelper(isolate, kSmiValueSize * 2, descriptors,
kPropsCount);
TestLayoutDescriptorHelper(isolate, kPropsCount, descriptors, kPropsCount);
}
TEST(LayoutDescriptorSharing) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
Isolate* isolate = CcTest::i_isolate();
Handle<HeapType> any_type = HeapType::Any(isolate);
Handle<Map> split_map;
{
Handle<Map> map = Map::Create(isolate, 64);
for (int i = 0; i < 32; i++) {
Handle<String> name = MakeName("prop", i);
map = Map::CopyWithField(map, name, any_type, NONE, Representation::Smi(),
INSERT_TRANSITION).ToHandleChecked();
}
split_map = Map::CopyWithField(map, MakeString("dbl"), any_type, NONE,
Representation::Double(),
INSERT_TRANSITION).ToHandleChecked();
}
Handle<LayoutDescriptor> split_layout_descriptor(
split_map->layout_descriptor(), isolate);
CHECK(split_layout_descriptor->IsConsistentWithMap(*split_map));
CHECK(split_layout_descriptor->IsSlowLayout());
CHECK(split_map->owns_descriptors());
Handle<Map> map1 = Map::CopyWithField(split_map, MakeString("foo"), any_type,
NONE, Representation::Double(),
INSERT_TRANSITION).ToHandleChecked();
CHECK(!split_map->owns_descriptors());
CHECK_EQ(*split_layout_descriptor, split_map->layout_descriptor());
// Layout descriptors should be shared with |split_map|.
CHECK(map1->owns_descriptors());
CHECK_EQ(*split_layout_descriptor, map1->layout_descriptor());
CHECK(map1->layout_descriptor()->IsConsistentWithMap(*map1));
Handle<Map> map2 = Map::CopyWithField(split_map, MakeString("bar"), any_type,
NONE, Representation::Tagged(),
INSERT_TRANSITION).ToHandleChecked();
// Layout descriptors should not be shared with |split_map|.
CHECK(map2->owns_descriptors());
CHECK_NE(*split_layout_descriptor, map2->layout_descriptor());
CHECK(map2->layout_descriptor()->IsConsistentWithMap(*map2));
}
TEST(StoreBufferScanOnScavenge) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
v8::HandleScope scope(CcTest::isolate());
CompileRun(
"function A() {"
" this.x = 42.5;"
" this.o = {};"
"};"
"var o = new A();");
Handle<String> obj_name = factory->InternalizeUtf8String("o");
Handle<Object> obj_value =
Object::GetProperty(isolate->global_object(), obj_name).ToHandleChecked();
CHECK(obj_value->IsJSObject());
Handle<JSObject> obj = Handle<JSObject>::cast(obj_value);
{
// Ensure the object is properly set up.
Map* map = obj->map();
DescriptorArray* descriptors = map->instance_descriptors();
CHECK(map->NumberOfOwnDescriptors() == 2);
CHECK(descriptors->GetDetails(0).representation().IsDouble());
CHECK(descriptors->GetDetails(1).representation().IsHeapObject());
FieldIndex field_index = FieldIndex::ForDescriptor(map, 0);
CHECK(field_index.is_inobject() && field_index.is_double());
CHECK_EQ(FLAG_unbox_double_fields, map->IsUnboxedDoubleField(field_index));
CHECK_EQ(42.5, GetDoubleFieldValue(*obj, field_index));
}
CHECK(isolate->heap()->new_space()->Contains(*obj));
// Trigger GCs so that the newly allocated object moves to old gen.
CcTest::heap()->CollectGarbage(i::NEW_SPACE); // in survivor space now
CcTest::heap()->CollectGarbage(i::NEW_SPACE); // in old gen now
CHECK(isolate->heap()->old_pointer_space()->Contains(*obj));
// Create temp object in the new space.
Handle<JSArray> temp = factory->NewJSArray(FAST_ELEMENTS, NOT_TENURED);
CHECK(isolate->heap()->new_space()->Contains(*temp));
// Construct a double value that looks like a pointer to the new space object
// and store it into the obj.
Address fake_object = reinterpret_cast<Address>(*temp) + kPointerSize;
double boom_value = bit_cast<double>(fake_object);
FieldIndex field_index = FieldIndex::ForDescriptor(obj->map(), 0);
Handle<HeapNumber> boom_number = factory->NewHeapNumber(boom_value, MUTABLE);
obj->FastPropertyAtPut(field_index, *boom_number);
// Enforce scan on scavenge for the obj's page.
MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
chunk->set_scan_on_scavenge(true);
// Trigger GCs and force evacuation. Should not crash there.
CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
CHECK_EQ(boom_value, GetDoubleFieldValue(*obj, field_index));
}
static int LenFromSize(int size) {
return (size - FixedArray::kHeaderSize) / kPointerSize;
}
TEST(WriteBarriersInCopyJSObject) {
FLAG_max_semi_space_size = 1; // Ensure new space is not growing.
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
TestHeap* heap = CcTest::test_heap();
v8::HandleScope scope(CcTest::isolate());
// The plan: create JSObject which contains unboxed double value that looks
// like a reference to an object in new space.
// Then clone this object (forcing it to go into old space) and check
// that the value of the unboxed double property of the cloned object has
// was not corrupted by GC.
// Step 1: prepare a map for the object. We add unboxed double property to it.
// Create a map with single inobject property.
Handle<Map> my_map = Map::Create(isolate, 1);
Handle<String> name = isolate->factory()->InternalizeUtf8String("foo");
my_map = Map::CopyWithField(my_map, name, HeapType::Any(isolate), NONE,
Representation::Double(),
INSERT_TRANSITION).ToHandleChecked();
my_map->set_pre_allocated_property_fields(1);
int n_properties = my_map->InitialPropertiesLength();
CHECK_GE(n_properties, 0);
int object_size = my_map->instance_size();
// Step 2: allocate a lot of objects so to almost fill new space: we need
// just enough room to allocate JSObject and thus fill the newspace.
int allocation_amount =
Min(FixedArray::kMaxSize, Page::kMaxRegularHeapObjectSize + kPointerSize);
int allocation_len = LenFromSize(allocation_amount);
NewSpace* new_space = heap->new_space();
Address* top_addr = new_space->allocation_top_address();
Address* limit_addr = new_space->allocation_limit_address();
while ((*limit_addr - *top_addr) > allocation_amount) {
CHECK(!heap->always_allocate());
Object* array = heap->AllocateFixedArray(allocation_len).ToObjectChecked();
CHECK(new_space->Contains(array));
}
// Step 3: now allocate fixed array and JSObject to fill the whole new space.
int to_fill = static_cast<int>(*limit_addr - *top_addr - object_size);
int fixed_array_len = LenFromSize(to_fill);
CHECK(fixed_array_len < FixedArray::kMaxLength);
CHECK(!heap->always_allocate());
Object* array = heap->AllocateFixedArray(fixed_array_len).ToObjectChecked();
CHECK(new_space->Contains(array));
Object* object = heap->AllocateJSObjectFromMap(*my_map).ToObjectChecked();
CHECK(new_space->Contains(object));
JSObject* jsobject = JSObject::cast(object);
CHECK_EQ(0, FixedArray::cast(jsobject->elements())->length());
CHECK_EQ(0, jsobject->properties()->length());
// Construct a double value that looks like a pointer to the new space object
// and store it into the obj.
Address fake_object = reinterpret_cast<Address>(array) + kPointerSize;
double boom_value = bit_cast<double>(fake_object);
FieldIndex index = FieldIndex::ForDescriptor(*my_map, 0);
jsobject->RawFastDoublePropertyAtPut(index, boom_value);
CHECK_EQ(0, static_cast<int>(*limit_addr - *top_addr));
// Step 4: clone jsobject, but force always allocate first to create a clone
// in old pointer space.
AlwaysAllocateScope aa_scope(isolate);
Object* clone_obj = heap->CopyJSObject(jsobject).ToObjectChecked();
Handle<JSObject> clone(JSObject::cast(clone_obj));
CHECK(heap->old_pointer_space()->Contains(clone->address()));
CcTest::heap()->CollectGarbage(NEW_SPACE, "boom");
// The value in cloned object should not be corrupted by GC.
CHECK_EQ(boom_value, clone->RawFastDoublePropertyAt(index));
}
static void TestWriteBarrier(Handle<Map> map, Handle<Map> new_map,
int tagged_descriptor, int double_descriptor,
bool check_tagged_value = true) {
FLAG_stress_compaction = true;
FLAG_manual_evacuation_candidates_selection = true;
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = CcTest::heap();
PagedSpace* old_pointer_space = heap->old_pointer_space();
// The plan: create |obj| by |map| in old space, create |obj_value| in
// new space and ensure that write barrier is triggered when |obj_value| is
// written to property |tagged_descriptor| of |obj|.
// Then migrate object to |new_map| and set proper value for property
// |double_descriptor|. Call GC and ensure that it did not crash during
// store buffer entries updating.
Handle<JSObject> obj;
Handle<HeapObject> obj_value;
{
AlwaysAllocateScope always_allocate(isolate);
obj = factory->NewJSObjectFromMap(map, TENURED, false);
CHECK(old_pointer_space->Contains(*obj));
obj_value = factory->NewJSArray(32 * KB, FAST_HOLEY_ELEMENTS);
}
CHECK(heap->InNewSpace(*obj_value));
StoreBuffer* store_buffer = heap->store_buffer();
USE(store_buffer);
Address slot;
{
FieldIndex index = FieldIndex::ForDescriptor(*map, tagged_descriptor);
int offset = index.offset();
slot = reinterpret_cast<Address>(HeapObject::RawField(*obj, offset));
USE(slot);
DCHECK(!store_buffer->CellIsInStoreBuffer(slot));
const int n = 153;
for (int i = 0; i < n; i++) {
obj->FastPropertyAtPut(index, *obj_value);
}
// Ensure that the slot was actually added to the store buffer.
DCHECK(store_buffer->CellIsInStoreBuffer(slot));
}
// Migrate |obj| to |new_map| which should shift fields and put the
// |boom_value| to the slot that was earlier recorded by write barrier.
JSObject::MigrateToMap(obj, new_map);
// Ensure that invalid entries were removed from the store buffer.
DCHECK(!store_buffer->CellIsInStoreBuffer(slot));
Address fake_object = reinterpret_cast<Address>(*obj_value) + kPointerSize;
double boom_value = bit_cast<double>(fake_object);
FieldIndex double_field_index =
FieldIndex::ForDescriptor(*new_map, double_descriptor);
CHECK(obj->IsUnboxedDoubleField(double_field_index));
obj->RawFastDoublePropertyAtPut(double_field_index, boom_value);
// Trigger GC to evacuate all candidates.
CcTest::heap()->CollectGarbage(NEW_SPACE, "boom");
if (check_tagged_value) {
FieldIndex tagged_field_index =
FieldIndex::ForDescriptor(*new_map, tagged_descriptor);
CHECK_EQ(*obj_value, obj->RawFastPropertyAt(tagged_field_index));
}
CHECK_EQ(boom_value, obj->RawFastDoublePropertyAt(double_field_index));
}
static void TestIncrementalWriteBarrier(Handle<Map> map, Handle<Map> new_map,
int tagged_descriptor,
int double_descriptor,
bool check_tagged_value = true) {
if (FLAG_never_compact || !FLAG_incremental_marking) return;
FLAG_stress_compaction = true;
FLAG_manual_evacuation_candidates_selection = true;
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = CcTest::heap();
PagedSpace* old_pointer_space = heap->old_pointer_space();
// The plan: create |obj| by |map| in old space, create |obj_value| in
// old space and ensure it end up in evacuation candidate page. Start
// incremental marking and ensure that incremental write barrier is triggered
// when |obj_value| is written to property |tagged_descriptor| of |obj|.
// Then migrate object to |new_map| and set proper value for property
// |double_descriptor|. Call GC and ensure that it did not crash during
// slots buffer entries updating.
Handle<JSObject> obj;
Handle<HeapObject> obj_value;
Page* ec_page;
{
AlwaysAllocateScope always_allocate(isolate);
obj = factory->NewJSObjectFromMap(map, TENURED, false);
CHECK(old_pointer_space->Contains(*obj));
// Make sure |obj_value| is placed on an old-space evacuation candidate.
SimulateFullSpace(old_pointer_space);
obj_value = factory->NewJSArray(32 * KB, FAST_HOLEY_ELEMENTS, TENURED);
ec_page = Page::FromAddress(obj_value->address());
CHECK_NE(ec_page, Page::FromAddress(obj->address()));
}
// Heap is ready, force |ec_page| to become an evacuation candidate and
// simulate incremental marking.
ec_page->SetFlag(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING);
SimulateIncrementalMarking(heap);
// Check that everything is ready for triggering incremental write barrier
// (i.e. that both |obj| and |obj_value| are black and the marking phase is
// still active and |obj_value|'s page is indeed an evacuation candidate).
IncrementalMarking* marking = heap->incremental_marking();
CHECK(marking->IsMarking());
CHECK(Marking::IsBlack(Marking::MarkBitFrom(*obj)));
CHECK(Marking::IsBlack(Marking::MarkBitFrom(*obj_value)));
CHECK(MarkCompactCollector::IsOnEvacuationCandidate(*obj_value));
// Trigger incremental write barrier, which should add a slot to |ec_page|'s
// slots buffer.
{
int slots_buffer_len = SlotsBuffer::SizeOfChain(ec_page->slots_buffer());
FieldIndex index = FieldIndex::ForDescriptor(*map, tagged_descriptor);
const int n = SlotsBuffer::kNumberOfElements + 10;
for (int i = 0; i < n; i++) {
obj->FastPropertyAtPut(index, *obj_value);
}
// Ensure that the slot was actually added to the |ec_page|'s slots buffer.
CHECK_EQ(slots_buffer_len + n,
SlotsBuffer::SizeOfChain(ec_page->slots_buffer()));
}
// Migrate |obj| to |new_map| which should shift fields and put the
// |boom_value| to the slot that was earlier recorded by incremental write
// barrier.
JSObject::MigrateToMap(obj, new_map);
double boom_value = bit_cast<double>(UINT64_C(0xbaad0176a37c28e1));
FieldIndex double_field_index =
FieldIndex::ForDescriptor(*new_map, double_descriptor);
CHECK(obj->IsUnboxedDoubleField(double_field_index));
obj->RawFastDoublePropertyAtPut(double_field_index, boom_value);
// Trigger GC to evacuate all candidates.
CcTest::heap()->CollectGarbage(OLD_POINTER_SPACE, "boom");
// Ensure that the values are still there and correct.
CHECK(!MarkCompactCollector::IsOnEvacuationCandidate(*obj_value));
if (check_tagged_value) {
FieldIndex tagged_field_index =
FieldIndex::ForDescriptor(*new_map, tagged_descriptor);
CHECK_EQ(*obj_value, obj->RawFastPropertyAt(tagged_field_index));
}
CHECK_EQ(boom_value, obj->RawFastDoublePropertyAt(double_field_index));
}
enum WriteBarrierKind { OLD_TO_OLD_WRITE_BARRIER, OLD_TO_NEW_WRITE_BARRIER };
static void TestWriteBarrierObjectShiftFieldsRight(
WriteBarrierKind write_barrier_kind) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
v8::HandleScope scope(CcTest::isolate());
Handle<HeapType> any_type = HeapType::Any(isolate);
CompileRun("function func() { return 1; }");
Handle<JSObject> func = GetObject("func");
Handle<Map> map = Map::Create(isolate, 10);
map = Map::CopyWithConstant(map, MakeName("prop", 0), func, NONE,
INSERT_TRANSITION).ToHandleChecked();
map = Map::CopyWithField(map, MakeName("prop", 1), any_type, NONE,
Representation::Double(),
INSERT_TRANSITION).ToHandleChecked();
map = Map::CopyWithField(map, MakeName("prop", 2), any_type, NONE,
Representation::Tagged(),
INSERT_TRANSITION).ToHandleChecked();
// Shift fields right by turning constant property to a field.
Handle<Map> new_map = Map::ReconfigureProperty(
map, 0, kData, NONE, Representation::Tagged(), any_type, FORCE_FIELD);
if (write_barrier_kind == OLD_TO_NEW_WRITE_BARRIER) {
TestWriteBarrier(map, new_map, 2, 1);
} else {
CHECK_EQ(OLD_TO_OLD_WRITE_BARRIER, write_barrier_kind);
TestIncrementalWriteBarrier(map, new_map, 2, 1);
}
}
TEST(WriteBarrierObjectShiftFieldsRight) {
TestWriteBarrierObjectShiftFieldsRight(OLD_TO_NEW_WRITE_BARRIER);
}
TEST(IncrementalWriteBarrierObjectShiftFieldsRight) {
TestWriteBarrierObjectShiftFieldsRight(OLD_TO_OLD_WRITE_BARRIER);
}
// TODO(ishell): add respective tests for property kind reconfiguring from
// accessor field to double, once accessor fields are supported by
// Map::ReconfigureProperty().
// TODO(ishell): add respective tests for fast property removal case once
// Map::ReconfigureProperty() supports that.
#endif
Reference in New Issue View Git Blame Copy Permalink