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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "intern_table.h"
#include "base/hash_set.h"
#include "common_runtime_test.h"
#include "dex/utf.h"
#include "gc_root-inl.h"
#include "handle_scope-inl.h"
#include "mirror/object.h"
#include "mirror/string.h"
#include "scoped_thread_state_change-inl.h"
namespace art {
class InternTableTest : public CommonRuntimeTest {};
TEST_F(InternTableTest, Intern) {
ScopedObjectAccess soa(Thread::Current());
InternTable intern_table;
StackHandleScope<4> hs(soa.Self());
Handle<mirror::String> foo_1(hs.NewHandle(intern_table.InternStrong(3, "foo")));
Handle<mirror::String> foo_2(hs.NewHandle(intern_table.InternStrong(3, "foo")));
Handle<mirror::String> foo_3(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "foo")));
Handle<mirror::String> bar(hs.NewHandle(intern_table.InternStrong(3, "bar")));
ASSERT_TRUE(foo_1 != nullptr);
ASSERT_TRUE(foo_2 != nullptr);
ASSERT_TRUE(foo_3 != nullptr);
ASSERT_TRUE(bar != nullptr);
EXPECT_EQ(foo_1.Get(), foo_2.Get());
EXPECT_TRUE(foo_1->Equals("foo"));
EXPECT_TRUE(foo_2->Equals("foo"));
EXPECT_TRUE(foo_3->Equals("foo"));
EXPECT_NE(foo_1.Get(), bar.Get());
EXPECT_NE(foo_2.Get(), bar.Get());
EXPECT_NE(foo_3.Get(), bar.Get());
}
TEST_F(InternTableTest, Size) {
ScopedObjectAccess soa(Thread::Current());
InternTable t;
EXPECT_EQ(0U, t.Size());
t.InternStrong(3, "foo");
StackHandleScope<1> hs(soa.Self());
Handle<mirror::String> foo(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "foo")));
t.InternWeak(foo.Get());
EXPECT_EQ(1U, t.Size());
t.InternStrong(3, "bar");
EXPECT_EQ(2U, t.Size());
}
// Check if table indexes match on 64 and 32 bit machines.
// This is done by ensuring hash values are the same on every machine and limited to 32-bit wide.
// Otherwise cross compilation can cause a table to be filled on host using one indexing algorithm
// and later on a device with different sizeof(size_t) can use another indexing algorithm.
// Thus the table may provide wrong data.
TEST_F(InternTableTest, CrossHash) {
ScopedObjectAccess soa(Thread::Current());
InternTable t;
// A string that has a negative hash value.
GcRoot<mirror::String> str(mirror::String::AllocFromModifiedUtf8(soa.Self(), "00000000"));
MutexLock mu(Thread::Current(), *Locks::intern_table_lock_);
for (InternTable::Table::InternalTable& table : t.strong_interns_.tables_) {
// The negative hash value shall be 32-bit wide on every host.
ASSERT_TRUE(IsUint<32>(table.set_.hashfn_(str)));
}
}
class TestPredicate : public IsMarkedVisitor {
public:
mirror::Object* IsMarked(mirror::Object* s) override REQUIRES_SHARED(Locks::mutator_lock_) {
bool erased = false;
for (auto it = expected_.begin(), end = expected_.end(); it != end; ++it) {
if (*it == s) {
expected_.erase(it);
erased = true;
break;
}
}
EXPECT_TRUE(erased);
return nullptr;
}
void Expect(const mirror::String* s) {
expected_.push_back(s);
}
~TestPredicate() {
EXPECT_EQ(0U, expected_.size());
}
private:
mutable std::vector<const mirror::String*> expected_;
};
TEST_F(InternTableTest, SweepInternTableWeaks) {
ScopedObjectAccess soa(Thread::Current());
InternTable t;
t.InternStrong(3, "foo");
t.InternStrong(3, "bar");
StackHandleScope<5> hs(soa.Self());
Handle<mirror::String> hello(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "hello")));
Handle<mirror::String> world(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "world")));
Handle<mirror::String> s0(hs.NewHandle(t.InternWeak(hello.Get())));
Handle<mirror::String> s1(hs.NewHandle(t.InternWeak(world.Get())));
EXPECT_EQ(4U, t.Size());
// We should traverse only the weaks...
TestPredicate p;
p.Expect(s0.Get());
p.Expect(s1.Get());
{
ReaderMutexLock mu(soa.Self(), *Locks::heap_bitmap_lock_);
t.SweepInternTableWeaks(&p);
}
EXPECT_EQ(2U, t.Size());
// Just check that we didn't corrupt the map.
Handle<mirror::String> still_here(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "still here")));
t.InternWeak(still_here.Get());
EXPECT_EQ(3U, t.Size());
}
TEST_F(InternTableTest, ContainsWeak) {
ScopedObjectAccess soa(Thread::Current());
{
// Strongs are never weak.
InternTable t;
StackHandleScope<2> hs(soa.Self());
Handle<mirror::String> interned_foo_1(hs.NewHandle(t.InternStrong(3, "foo")));
EXPECT_FALSE(t.ContainsWeak(interned_foo_1.Get()));
Handle<mirror::String> interned_foo_2(hs.NewHandle(t.InternStrong(3, "foo")));
EXPECT_FALSE(t.ContainsWeak(interned_foo_2.Get()));
EXPECT_EQ(interned_foo_1.Get(), interned_foo_2.Get());
}
{
// Weaks are always weak.
InternTable t;
StackHandleScope<4> hs(soa.Self());
Handle<mirror::String> foo_1(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "foo")));
Handle<mirror::String> foo_2(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "foo")));
EXPECT_NE(foo_1.Get(), foo_2.Get());
Handle<mirror::String> interned_foo_1(hs.NewHandle(t.InternWeak(foo_1.Get())));
Handle<mirror::String> interned_foo_2(hs.NewHandle(t.InternWeak(foo_2.Get())));
EXPECT_TRUE(t.ContainsWeak(interned_foo_2.Get()));
EXPECT_EQ(interned_foo_1.Get(), interned_foo_2.Get());
}
{
// A weak can be promoted to a strong.
InternTable t;
StackHandleScope<3> hs(soa.Self());
Handle<mirror::String> foo(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "foo")));
Handle<mirror::String> interned_foo_1(hs.NewHandle(t.InternWeak(foo.Get())));
EXPECT_TRUE(t.ContainsWeak(interned_foo_1.Get()));
Handle<mirror::String> interned_foo_2(hs.NewHandle(t.InternStrong(3, "foo")));
EXPECT_FALSE(t.ContainsWeak(interned_foo_2.Get()));
EXPECT_EQ(interned_foo_1.Get(), interned_foo_2.Get());
}
{
// Interning a weak after a strong gets you the strong.
InternTable t;
StackHandleScope<3> hs(soa.Self());
Handle<mirror::String> interned_foo_1(hs.NewHandle(t.InternStrong(3, "foo")));
EXPECT_FALSE(t.ContainsWeak(interned_foo_1.Get()));
Handle<mirror::String> foo(
hs.NewHandle(mirror::String::AllocFromModifiedUtf8(soa.Self(), "foo")));
Handle<mirror::String> interned_foo_2(hs.NewHandle(t.InternWeak(foo.Get())));
EXPECT_FALSE(t.ContainsWeak(interned_foo_2.Get()));
EXPECT_EQ(interned_foo_1.Get(), interned_foo_2.Get());
}
}
TEST_F(InternTableTest, LookupStrong) {
ScopedObjectAccess soa(Thread::Current());
InternTable intern_table;
StackHandleScope<3> hs(soa.Self());
Handle<mirror::String> foo(hs.NewHandle(intern_table.InternStrong(3, "foo")));
Handle<mirror::String> bar(hs.NewHandle(intern_table.InternStrong(3, "bar")));
Handle<mirror::String> foobar(hs.NewHandle(intern_table.InternStrong(6, "foobar")));
ASSERT_TRUE(foo != nullptr);
ASSERT_TRUE(bar != nullptr);
ASSERT_TRUE(foobar != nullptr);
ASSERT_TRUE(foo->Equals("foo"));
ASSERT_TRUE(bar->Equals("bar"));
ASSERT_TRUE(foobar->Equals("foobar"));
ASSERT_NE(foo.Get(), bar.Get());
ASSERT_NE(foo.Get(), foobar.Get());
ASSERT_NE(bar.Get(), foobar.Get());
ObjPtr<mirror::String> lookup_foo = intern_table.LookupStrong(soa.Self(), 3, "foo");
EXPECT_OBJ_PTR_EQ(lookup_foo, foo.Get());
ObjPtr<mirror::String> lookup_bar = intern_table.LookupStrong(soa.Self(), 3, "bar");
EXPECT_OBJ_PTR_EQ(lookup_bar, bar.Get());
ObjPtr<mirror::String> lookup_foobar = intern_table.LookupStrong(soa.Self(), 6, "foobar");
EXPECT_OBJ_PTR_EQ(lookup_foobar, foobar.Get());
ObjPtr<mirror::String> lookup_foox = intern_table.LookupStrong(soa.Self(), 4, "foox");
EXPECT_TRUE(lookup_foox == nullptr);
ObjPtr<mirror::String> lookup_fooba = intern_table.LookupStrong(soa.Self(), 5, "fooba");
EXPECT_TRUE(lookup_fooba == nullptr);
ObjPtr<mirror::String> lookup_foobaR = intern_table.LookupStrong(soa.Self(), 6, "foobaR");
EXPECT_TRUE(lookup_foobaR == nullptr);
// Try a hash conflict.
ASSERT_EQ(ComputeUtf16HashFromModifiedUtf8("foobar", 6),
ComputeUtf16HashFromModifiedUtf8("foobbS", 6));
ObjPtr<mirror::String> lookup_foobbS = intern_table.LookupStrong(soa.Self(), 6, "foobbS");
EXPECT_TRUE(lookup_foobbS == nullptr);
}
} // namespace art