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// 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-inl.h"
#include "src/api.h"
#include "src/heap/spaces.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "test/cctest/cctest.h"
#include "test/cctest/heap/heap-tester.h"
#include "test/cctest/heap/heap-utils.h"
#define TEST_STR "tests are great!"
namespace v8 {
namespace internal {
namespace heap {
// Adapted from cctest/test-api.cc
class TestOneByteResource : public v8::String::ExternalOneByteStringResource {
public:
explicit TestOneByteResource(const char* data, int* counter = nullptr,
size_t offset = 0)
: orig_data_(data),
data_(data + offset),
length_(strlen(data) - offset),
counter_(counter) {}
~TestOneByteResource() {
i::DeleteArray(orig_data_);
if (counter_ != nullptr) ++*counter_;
}
const char* data() const { return data_; }
size_t length() const { return length_; }
private:
const char* orig_data_;
const char* data_;
size_t length_;
int* counter_;
};
TEST(ExternalString_ExternalBackingStoreSizeIncreases) {
CcTest::InitializeVM();
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
Heap* heap = reinterpret_cast<Isolate*>(isolate)->heap();
ExternalBackingStoreType type = ExternalBackingStoreType::kExternalString;
const size_t backing_store_before =
heap->old_space()->ExternalBackingStoreBytes(type);
{
v8::HandleScope handle_scope(isolate);
v8::Local<v8::String> es = v8::String::NewExternalOneByte(
isolate, new TestOneByteResource(i::StrDup(TEST_STR))).ToLocalChecked();
USE(es);
const size_t backing_store_after =
heap->old_space()->ExternalBackingStoreBytes(type);
CHECK_EQ(es->Length(), backing_store_after - backing_store_before);
}
}
TEST(ExternalString_ExternalBackingStoreSizeDecreases) {
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
Heap* heap = reinterpret_cast<Isolate*>(isolate)->heap();
ExternalBackingStoreType type = ExternalBackingStoreType::kExternalString;
const size_t backing_store_before =
heap->old_space()->ExternalBackingStoreBytes(type);
{
v8::HandleScope handle_scope(isolate);
v8::Local<v8::String> es = v8::String::NewExternalOneByte(
isolate, new TestOneByteResource(i::StrDup(TEST_STR))).ToLocalChecked();
USE(es);
}
heap::GcAndSweep(heap, OLD_SPACE);
const size_t backing_store_after =
heap->old_space()->ExternalBackingStoreBytes(type);
CHECK_EQ(0, backing_store_after - backing_store_before);
}
TEST(ExternalString_ExternalBackingStoreSizeIncreasesMarkCompact) {
if (FLAG_never_compact) return;
ManualGCScope manual_gc_scope;
FLAG_manual_evacuation_candidates_selection = true;
CcTest::InitializeVM();
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
Heap* heap = reinterpret_cast<Isolate*>(isolate)->heap();
heap::AbandonCurrentlyFreeMemory(heap->old_space());
ExternalBackingStoreType type = ExternalBackingStoreType::kExternalString;
const size_t backing_store_before =
heap->old_space()->ExternalBackingStoreBytes(type);
{
v8::HandleScope handle_scope(isolate);
v8::Local<v8::String> es = v8::String::NewExternalOneByte(
isolate, new TestOneByteResource(i::StrDup(TEST_STR))).ToLocalChecked();
v8::internal::Handle<v8::internal::String> esh = v8::Utils::OpenHandle(*es);
Page* page_before_gc = Page::FromAddress(esh->address());
heap::ForceEvacuationCandidate(page_before_gc);
CcTest::CollectAllGarbage();
const size_t backing_store_after =
heap->old_space()->ExternalBackingStoreBytes(type);
CHECK_EQ(es->Length(), backing_store_after - backing_store_before);
}
heap::GcAndSweep(heap, OLD_SPACE);
const size_t backing_store_after =
heap->old_space()->ExternalBackingStoreBytes(type);
CHECK_EQ(0, backing_store_after - backing_store_before);
}
TEST(ExternalString_ExternalBackingStoreSizeIncreasesAfterExternalization) {
CcTest::InitializeVM();
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
Heap* heap = reinterpret_cast<Isolate*>(isolate)->heap();
ExternalBackingStoreType type = ExternalBackingStoreType::kExternalString;
size_t old_backing_store_before = 0, new_backing_store_before = 0;
{
v8::HandleScope handle_scope(isolate);
new_backing_store_before =
heap->new_space()->ExternalBackingStoreBytes(type);
old_backing_store_before =
heap->old_space()->ExternalBackingStoreBytes(type);
// Allocate normal string in the new gen.
v8::Local<v8::String> str =
v8::String::NewFromUtf8(isolate, TEST_STR, v8::NewStringType::kNormal)
.ToLocalChecked();
CHECK_EQ(0, heap->new_space()->ExternalBackingStoreBytes(type) -
new_backing_store_before);
// Trigger GCs so that the newly allocated string moves to old gen.
heap::GcAndSweep(heap, NEW_SPACE); // in survivor space now
heap::GcAndSweep(heap, NEW_SPACE); // in old gen now
bool success =
str->MakeExternal(new TestOneByteResource(i::StrDup(TEST_STR)));
CHECK(success);
CHECK_EQ(str->Length(), heap->old_space()->ExternalBackingStoreBytes(type) -
old_backing_store_before);
}
heap::GcAndSweep(heap, OLD_SPACE);
CHECK_EQ(0, heap->old_space()->ExternalBackingStoreBytes(type) -
old_backing_store_before);
}
TEST(ExternalString_PromotedThinString) {
ManualGCScope manual_gc_scope;
CcTest::InitializeVM();
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
i::Isolate* i_isolate = CcTest::i_isolate();
i::Factory* factory = i_isolate->factory();
Heap* heap = i_isolate->heap();
{
v8::HandleScope handle_scope(isolate);
// New external string in the old space.
v8::internal::Handle<v8::internal::String> string1 =
factory
->NewExternalStringFromOneByte(
new TestOneByteResource(i::StrDup(TEST_STR)))
.ToHandleChecked();
// Internalize external string.
i::Handle<i::String> isymbol1 = factory->InternalizeString(string1);
CHECK(isymbol1->IsInternalizedString());
CHECK(string1->IsExternalString());
CHECK(!heap->InNewSpace(*isymbol1));
// New external string in the young space. This string has the same content
// as the previous one (that was already internalized).
v8::Local<v8::String> string2 =
v8::String::NewFromUtf8(isolate, TEST_STR, v8::NewStringType::kNormal)
.ToLocalChecked();
bool success =
string2->MakeExternal(new TestOneByteResource(i::StrDup(TEST_STR)));
CHECK(success);
// Internalize (it will create a thin string in the new space).
i::Handle<i::String> istring = v8::Utils::OpenHandle(*string2);
i::Handle<i::String> isymbol2 = factory->InternalizeString(istring);
CHECK(isymbol2->IsInternalizedString());
CHECK(istring->IsThinString());
CHECK(heap->InNewSpace(*istring));
// Collect thin string. References to the thin string will be updated to
// point to the actual external string in the old space.
heap::GcAndSweep(heap, NEW_SPACE);
USE(isymbol1);
USE(isymbol2);
}
}
} // namespace heap
} // namespace internal
} // namespace v8
#undef TEST_STR
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