blob: b3ec8cbf5abbdeec7594aba9603a4c3f0e98664c [file] [log] [blame]
// Copyright 2018 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/api/api-inl.h"
#include "src/codegen/assembler-inl.h"
#include "src/execution/isolate.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h"
#include "src/objects/smi.h"
#include "test/cctest/cctest.h"
#include "test/cctest/heap/heap-tester.h"
#include "test/cctest/heap/heap-utils.h"
namespace v8 {
namespace internal {
namespace heap {
Handle<LoadHandler> CreateLoadHandlerForTest(
Factory* factory, AllocationType allocation = AllocationType::kYoung) {
Handle<LoadHandler> result = factory->NewLoadHandler(1, allocation);
result->set_smi_handler(Smi::kZero);
result->set_validity_cell(Smi::kZero);
result->set_data1(MaybeObject::FromSmi(Smi::zero()));
return result;
}
TEST(WeakReferencesBasic) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh = CreateLoadHandlerForTest(factory);
CHECK(Heap::InYoungGeneration(*lh));
MaybeObject code_object = lh->data1();
CHECK(code_object->IsSmi());
CcTest::CollectAllGarbage();
CHECK(Heap::InYoungGeneration(*lh));
CHECK_EQ(code_object, lh->data1());
{
HandleScope inner_scope(isolate);
// Create a new Code.
Assembler assm(AssemblerOptions{});
assm.nop(); // supported on all architectures
CodeDesc desc;
assm.GetCode(isolate, &desc);
Handle<Code> code = Factory::CodeBuilder(isolate, desc, Code::STUB).Build();
CHECK(code->IsCode());
lh->set_data1(HeapObjectReference::Weak(*code));
HeapObject code_heap_object;
CHECK(lh->data1()->GetHeapObjectIfWeak(&code_heap_object));
CHECK_EQ(*code, code_heap_object);
CcTest::CollectAllGarbage();
CHECK(lh->data1()->GetHeapObjectIfWeak(&code_heap_object));
CHECK_EQ(*code, code_heap_object);
} // code will go out of scope.
CcTest::CollectAllGarbage();
CHECK(lh->data1()->IsCleared());
}
TEST(WeakReferencesOldToOld) {
// Like WeakReferencesBasic, but the updated weak slot is in the old space,
// and referring to an old space object.
ManualGCScope manual_gc_scope;
FLAG_manual_evacuation_candidates_selection = true;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh =
CreateLoadHandlerForTest(factory, AllocationType::kOld);
CHECK(heap->InOldSpace(*lh));
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array =
factory->NewFixedArray(1, AllocationType::kOld);
CHECK(heap->InOldSpace(*fixed_array));
lh->set_data1(HeapObjectReference::Weak(*fixed_array));
Page* page_before_gc = Page::FromHeapObject(*fixed_array);
heap::ForceEvacuationCandidate(page_before_gc);
CcTest::CollectAllGarbage();
CHECK(heap->InOldSpace(*fixed_array));
HeapObject heap_object;
CHECK(lh->data1()->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(heap_object, *fixed_array);
}
TEST(WeakReferencesOldToNew) {
// Like WeakReferencesBasic, but the updated weak slot is in the old space,
// and referring to an new space object.
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh =
CreateLoadHandlerForTest(factory, AllocationType::kOld);
CHECK(heap->InOldSpace(*lh));
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array));
lh->set_data1(HeapObjectReference::Weak(*fixed_array));
CcTest::CollectAllGarbage();
HeapObject heap_object;
CHECK(lh->data1()->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(heap_object, *fixed_array);
}
TEST(WeakReferencesOldToNewScavenged) {
// Like WeakReferencesBasic, but the updated weak slot is in the old space,
// and referring to an new space object, which is then scavenged.
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh =
CreateLoadHandlerForTest(factory, AllocationType::kOld);
CHECK(heap->InOldSpace(*lh));
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array));
lh->set_data1(HeapObjectReference::Weak(*fixed_array));
CcTest::CollectGarbage(NEW_SPACE);
HeapObject heap_object;
CHECK(lh->data1()->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(heap_object, *fixed_array);
}
TEST(WeakReferencesOldToCleared) {
// Like WeakReferencesBasic, but the updated weak slot is in the old space,
// and is cleared.
ManualGCScope manual_gc_scope;
FLAG_manual_evacuation_candidates_selection = true;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh =
CreateLoadHandlerForTest(factory, AllocationType::kOld);
CHECK(heap->InOldSpace(*lh));
lh->set_data1(HeapObjectReference::ClearedValue(isolate));
CcTest::CollectAllGarbage();
CHECK(lh->data1()->IsCleared());
}
TEST(ObjectMovesBeforeClearingWeakField) {
if (!FLAG_incremental_marking) {
return;
}
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh = CreateLoadHandlerForTest(factory);
CHECK(Heap::InYoungGeneration(*lh));
LoadHandler lh_location = *lh;
{
HandleScope inner_scope(isolate);
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array));
lh->set_data1(HeapObjectReference::Weak(*fixed_array));
// inner_scope will go out of scope, so when marking the next time,
// *fixed_array will stay white.
}
// Do marking steps; this will store *lh into the list for later processing
// (since it points to a white object).
SimulateIncrementalMarking(heap, true);
// Scavenger will move *lh.
CcTest::CollectGarbage(NEW_SPACE);
LoadHandler new_lh_location = *lh;
CHECK_NE(lh_location, new_lh_location);
CHECK(lh->data1()->IsWeak());
// Now we try to clear *lh.
CcTest::CollectAllGarbage();
CHECK(lh->data1()->IsCleared());
}
TEST(ObjectWithWeakFieldDies) {
if (!FLAG_incremental_marking) {
return;
}
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
{
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh = CreateLoadHandlerForTest(factory);
CHECK(Heap::InYoungGeneration(*lh));
{
HandleScope inner_scope(isolate);
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array));
lh->set_data1(HeapObjectReference::Weak(*fixed_array));
// inner_scope will go out of scope, so when marking the next time,
// *fixed_array will stay white.
}
// Do marking steps; this will store *lh into the list for later processing
// (since it points to a white object).
SimulateIncrementalMarking(heap, true);
} // outer_scope goes out of scope
// lh will die
CcTest::CollectGarbage(NEW_SPACE);
// This used to crash when processing the dead weak reference.
CcTest::CollectAllGarbage();
}
TEST(ObjectWithWeakReferencePromoted) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh = CreateLoadHandlerForTest(factory);
CHECK(Heap::InYoungGeneration(*lh));
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array));
lh->set_data1(HeapObjectReference::Weak(*fixed_array));
CcTest::CollectGarbage(NEW_SPACE);
CcTest::CollectGarbage(NEW_SPACE);
CHECK(heap->InOldSpace(*lh));
CHECK(heap->InOldSpace(*fixed_array));
HeapObject heap_object;
CHECK(lh->data1()->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(heap_object, *fixed_array);
}
TEST(ObjectWithClearedWeakReferencePromoted) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh = CreateLoadHandlerForTest(factory);
CHECK(Heap::InYoungGeneration(*lh));
lh->set_data1(HeapObjectReference::ClearedValue(isolate));
CcTest::CollectGarbage(NEW_SPACE);
CHECK(Heap::InYoungGeneration(*lh));
CHECK(lh->data1()->IsCleared());
CcTest::CollectGarbage(NEW_SPACE);
CHECK(heap->InOldSpace(*lh));
CHECK(lh->data1()->IsCleared());
CcTest::CollectAllGarbage();
CHECK(lh->data1()->IsCleared());
}
TEST(WeakReferenceWriteBarrier) {
if (!FLAG_incremental_marking) {
return;
}
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<LoadHandler> lh = CreateLoadHandlerForTest(factory);
CHECK(Heap::InYoungGeneration(*lh));
{
HandleScope inner_scope(isolate);
// Create a new FixedArray which the LoadHandler will point to.
Handle<FixedArray> fixed_array1 = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array1));
lh->set_data1(HeapObjectReference::Weak(*fixed_array1));
SimulateIncrementalMarking(heap, true);
Handle<FixedArray> fixed_array2 = factory->NewFixedArray(1);
CHECK(Heap::InYoungGeneration(*fixed_array2));
// This write will trigger the write barrier.
lh->set_data1(HeapObjectReference::Weak(*fixed_array2));
}
CcTest::CollectAllGarbage();
// Check that the write barrier treated the weak reference as strong.
CHECK(lh->data1()->IsWeak());
}
TEST(EmptyWeakArray) {
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope outer_scope(isolate);
Handle<WeakFixedArray> array = factory->empty_weak_fixed_array();
CHECK(array->IsWeakFixedArray());
CHECK(!array->IsFixedArray());
CHECK_EQ(array->length(), 0);
}
TEST(WeakArraysBasic) {
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
const int length = 4;
Handle<WeakFixedArray> array = factory->NewWeakFixedArray(length);
CHECK(array->IsWeakFixedArray());
CHECK(!array->IsFixedArray());
CHECK_EQ(array->length(), length);
CHECK(Heap::InYoungGeneration(*array));
for (int i = 0; i < length; ++i) {
HeapObject heap_object;
CHECK(array->Get(i)->GetHeapObjectIfStrong(&heap_object));
CHECK_EQ(heap_object, ReadOnlyRoots(heap).undefined_value());
}
Handle<HeapObject> saved;
{
HandleScope inner_scope(isolate);
Handle<FixedArray> index0 = factory->NewFixedArray(1);
index0->set(0, Smi::FromInt(2016));
Handle<FixedArray> index1 = factory->NewFixedArray(1);
index1->set(0, Smi::FromInt(2017));
Handle<FixedArray> index2 = factory->NewFixedArray(1);
index2->set(0, Smi::FromInt(2018));
Handle<FixedArray> index3 = factory->NewFixedArray(1);
index3->set(0, Smi::FromInt(2019));
array->Set(0, HeapObjectReference::Weak(*index0));
array->Set(1, HeapObjectReference::Weak(*index1));
array->Set(2, HeapObjectReference::Strong(*index2));
array->Set(3, HeapObjectReference::Weak(*index3));
saved = inner_scope.CloseAndEscape(index1);
} // inner_scope goes out of scope.
// The references are only cleared by the mark-compact (scavenger treats weak
// references as strong). Thus we need to GC until the array reaches old
// space.
// TODO(marja): update this when/if we do handle weak references in the new
// space.
CcTest::CollectGarbage(NEW_SPACE);
HeapObject heap_object;
CHECK(array->Get(0)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2016);
CHECK(array->Get(1)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2017);
CHECK(array->Get(2)->GetHeapObjectIfStrong(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2018);
CHECK(array->Get(3)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2019);
CcTest::CollectAllGarbage();
CHECK(heap->InOldSpace(*array));
CHECK(array->Get(0)->IsCleared());
CHECK(array->Get(1)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2017);
CHECK(array->Get(2)->GetHeapObjectIfStrong(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2018);
CHECK(array->Get(3)->IsCleared());
}
TEST(WeakArrayListBasic) {
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<WeakArrayList> array(ReadOnlyRoots(heap).empty_weak_array_list(),
isolate);
CHECK(array->IsWeakArrayList());
CHECK(!array->IsFixedArray());
CHECK(!array->IsWeakFixedArray());
CHECK_EQ(array->length(), 0);
Handle<FixedArray> index2 = factory->NewFixedArray(1);
index2->set(0, Smi::FromInt(2017));
Handle<HeapObject> saved;
{
HandleScope inner_scope(isolate);
Handle<FixedArray> index0 = factory->NewFixedArray(1);
index0->set(0, Smi::FromInt(2016));
Handle<FixedArray> index4 = factory->NewFixedArray(1);
index4->set(0, Smi::FromInt(2018));
Handle<FixedArray> index6 = factory->NewFixedArray(1);
index6->set(0, Smi::FromInt(2019));
array = WeakArrayList::AddToEnd(isolate, array,
MaybeObjectHandle::Weak(index0));
array = WeakArrayList::AddToEnd(
isolate, array, MaybeObjectHandle(Smi::FromInt(1), isolate));
CHECK_EQ(array->length(), 2);
array = WeakArrayList::AddToEnd(isolate, array,
MaybeObjectHandle::Weak(index2));
array = WeakArrayList::AddToEnd(
isolate, array, MaybeObjectHandle(Smi::FromInt(3), isolate));
CHECK_EQ(array->length(), 4);
array = WeakArrayList::AddToEnd(isolate, array,
MaybeObjectHandle::Weak(index4));
array = WeakArrayList::AddToEnd(
isolate, array, MaybeObjectHandle(Smi::FromInt(5), isolate));
CHECK_EQ(array->length(), 6);
array = WeakArrayList::AddToEnd(isolate, array,
MaybeObjectHandle::Weak(index6));
array = WeakArrayList::AddToEnd(
isolate, array, MaybeObjectHandle(Smi::FromInt(7), isolate));
CHECK_EQ(array->length(), 8);
CHECK(Heap::InYoungGeneration(*array));
CHECK_EQ(array->Get(0), HeapObjectReference::Weak(*index0));
CHECK_EQ(array->Get(1).ToSmi().value(), 1);
CHECK_EQ(array->Get(2), HeapObjectReference::Weak(*index2));
CHECK_EQ(array->Get(3).ToSmi().value(), 3);
CHECK_EQ(array->Get(4), HeapObjectReference::Weak(*index4));
CHECK_EQ(array->Get(5).ToSmi().value(), 5);
CHECK_EQ(array->Get(6), HeapObjectReference::Weak(*index6));
array = inner_scope.CloseAndEscape(array);
} // inner_scope goes out of scope.
// The references are only cleared by the mark-compact (scavenger treats weak
// references as strong). Thus we need to GC until the array reaches old
// space.
// TODO(marja): update this when/if we do handle weak references in the new
// space.
CcTest::CollectGarbage(NEW_SPACE);
HeapObject heap_object;
CHECK_EQ(array->length(), 8);
CHECK(array->Get(0)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2016);
CHECK_EQ(array->Get(1).ToSmi().value(), 1);
CHECK(array->Get(2)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2017);
CHECK_EQ(array->Get(3).ToSmi().value(), 3);
CHECK(array->Get(4)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2018);
CHECK_EQ(array->Get(5).ToSmi().value(), 5);
CHECK(array->Get(6)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2019);
CHECK_EQ(array->Get(7).ToSmi().value(), 7);
CcTest::CollectAllGarbage();
CHECK(heap->InOldSpace(*array));
CHECK_EQ(array->length(), 8);
CHECK(array->Get(0)->IsCleared());
CHECK_EQ(array->Get(1).ToSmi().value(), 1);
CHECK(array->Get(2)->GetHeapObjectIfWeak(&heap_object));
CHECK_EQ(Smi::cast(FixedArray::cast(heap_object).get(0)).value(), 2017);
CHECK_EQ(array->Get(3).ToSmi().value(), 3);
CHECK(array->Get(4)->IsCleared());
CHECK_EQ(array->Get(5).ToSmi().value(), 5);
CHECK(array->Get(6)->IsCleared());
CHECK_EQ(array->Get(7).ToSmi().value(), 7);
}
TEST(WeakArrayListRemove) {
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<WeakArrayList> array(ReadOnlyRoots(heap).empty_weak_array_list(),
isolate);
Handle<FixedArray> elem0 = factory->NewFixedArray(1);
Handle<FixedArray> elem1 = factory->NewFixedArray(1);
Handle<FixedArray> elem2 = factory->NewFixedArray(1);
array =
WeakArrayList::AddToEnd(isolate, array, MaybeObjectHandle::Weak(elem0));
array =
WeakArrayList::AddToEnd(isolate, array, MaybeObjectHandle::Weak(elem1));
array =
WeakArrayList::AddToEnd(isolate, array, MaybeObjectHandle::Weak(elem2));
CHECK_EQ(array->length(), 3);
CHECK_EQ(array->Get(0), HeapObjectReference::Weak(*elem0));
CHECK_EQ(array->Get(1), HeapObjectReference::Weak(*elem1));
CHECK_EQ(array->Get(2), HeapObjectReference::Weak(*elem2));
CHECK(array->RemoveOne(MaybeObjectHandle::Weak(elem1)));
CHECK_EQ(array->length(), 2);
CHECK_EQ(array->Get(0), HeapObjectReference::Weak(*elem0));
CHECK_EQ(array->Get(1), HeapObjectReference::Weak(*elem2));
CHECK(!array->RemoveOne(MaybeObjectHandle::Weak(elem1)));
CHECK_EQ(array->length(), 2);
CHECK_EQ(array->Get(0), HeapObjectReference::Weak(*elem0));
CHECK_EQ(array->Get(1), HeapObjectReference::Weak(*elem2));
CHECK(array->RemoveOne(MaybeObjectHandle::Weak(elem0)));
CHECK_EQ(array->length(), 1);
CHECK_EQ(array->Get(0), HeapObjectReference::Weak(*elem2));
CHECK(array->RemoveOne(MaybeObjectHandle::Weak(elem2)));
CHECK_EQ(array->length(), 0);
}
TEST(Regress7768) {
i::FLAG_allow_natives_syntax = true;
i::FLAG_turbo_inlining = false;
if (!FLAG_incremental_marking) {
return;
}
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
LocalContext context;
Isolate* isolate = CcTest::i_isolate();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
// Create an optimized code which will contain a weak reference to another
// function ("f"). The weak reference is the only reference to the function.
CompileRun(
"function myfunc(f) { f(); } "
"%PrepareFunctionForOptimization(myfunc); "
"(function wrapper() { "
" function f() {}; myfunc(f); myfunc(f); "
" %OptimizeFunctionOnNextCall(myfunc); myfunc(f); "
" %ClearFunctionFeedback(wrapper);"
"})(); "
"%ClearFunctionFeedback(myfunc);");
// Do marking steps; this will store the objects pointed by myfunc for later
// processing.
SimulateIncrementalMarking(heap, true);
// Deoptimize the code; now the pointers inside it will be replaced with
// undefined, and the weak_objects_in_code is the only place pointing to the
// function f.
CompileRun("%DeoptimizeFunction(myfunc);");
// The object pointed to by the weak reference won't be scavenged.
CcTest::CollectGarbage(NEW_SPACE);
// Make sure the memory where it's stored is invalidated, so that we'll crash
// if we try to access it.
HeapTester::UncommitFromSpace(heap);
// This used to crash when processing the dead weak reference.
CcTest::CollectAllGarbage();
}
TEST(PrototypeUsersBasic) {
CcTest::InitializeVM();
LocalContext context;
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<WeakArrayList> array(ReadOnlyRoots(heap).empty_weak_array_list(),
isolate);
// Add some objects into the array.
int index = -1;
{
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
CHECK_EQ(array->length(), index + 1);
}
CHECK_EQ(index, 1);
int empty_index = index;
PrototypeUsers::MarkSlotEmpty(*array, empty_index);
// Even though we have an empty slot, we still add to the end.
int last_index = index;
int old_capacity = array->capacity();
while (!array->IsFull()) {
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
CHECK_EQ(index, last_index + 1);
CHECK_EQ(array->length(), index + 1);
last_index = index;
}
// The next addition will fill the empty slot.
{
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
}
CHECK_EQ(index, empty_index);
// The next addition will make the arrow grow again.
{
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
CHECK_EQ(array->length(), index + 1);
last_index = index;
}
CHECK_GT(array->capacity(), old_capacity);
// Make multiple slots empty.
int empty_index1 = 1;
int empty_index2 = 2;
PrototypeUsers::MarkSlotEmpty(*array, empty_index1);
PrototypeUsers::MarkSlotEmpty(*array, empty_index2);
// Fill the array (still adding to the end)
old_capacity = array->capacity();
while (!array->IsFull()) {
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
CHECK_EQ(index, last_index + 1);
CHECK_EQ(array->length(), index + 1);
last_index = index;
}
// Make sure we use the empty slots in (reverse) order.
{
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
}
CHECK_EQ(index, empty_index2);
{
Handle<Map> map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map, &index);
}
CHECK_EQ(index, empty_index1);
}
namespace {
HeapObject saved_heap_object;
static void TestCompactCallback(HeapObject value, int old_index,
int new_index) {
saved_heap_object = value;
CHECK_EQ(old_index, 2);
CHECK_EQ(new_index, 1);
}
} // namespace
TEST(PrototypeUsersCompacted) {
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
LocalContext context;
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
Heap* heap = isolate->heap();
HandleScope outer_scope(isolate);
Handle<WeakArrayList> array(ReadOnlyRoots(heap).empty_weak_array_list(),
isolate);
// Add some objects into the array.
int index = -1;
Handle<Map> map_cleared_by_user =
factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, map_cleared_by_user, &index);
CHECK_EQ(index, 1);
Handle<Map> live_map = factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, live_map, &index);
CHECK_EQ(index, 2);
{
HandleScope inner_scope(isolate);
Handle<Map> soon_dead_map =
factory->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
array = PrototypeUsers::Add(isolate, array, soon_dead_map, &index);
CHECK_EQ(index, 3);
array = inner_scope.CloseAndEscape(array);
}
PrototypeUsers::MarkSlotEmpty(*array, 1);
CcTest::CollectAllGarbage();
CHECK(array->Get(3)->IsCleared());
CHECK_EQ(array->length(), 3 + PrototypeUsers::kFirstIndex);
WeakArrayList new_array =
PrototypeUsers::Compact(array, heap, TestCompactCallback);
CHECK_EQ(new_array.length(), 1 + PrototypeUsers::kFirstIndex);
CHECK_EQ(saved_heap_object, *live_map);
}
} // namespace heap
} // namespace internal
} // namespace v8