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/*
* Copyright (C) 2016 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 "string_reference.h"
#include <memory>
#include "dex/dex_file_types.h"
#include "dex/test_dex_file_builder.h"
#include "gtest/gtest.h"
namespace art {
TEST(StringReference, ValueComparator) {
// This is a regression test for the StringReferenceValueComparator using the wrong
// dex file to get the string data from a StringId. We construct two dex files with
// just a single string with the same length but different value. This creates dex
// files that have the same layout, so the byte offset read from the StringId in one
// dex file, when used in the other dex file still points to valid string data, except
// that it's the wrong string. Without the fix the strings would then compare equal.
TestDexFileBuilder builder1;
builder1.AddString("String1");
std::unique_ptr<const DexFile> dex_file1 = builder1.Build("fake location 1");
ASSERT_EQ(1u, dex_file1->NumStringIds());
ASSERT_STREQ("String1", dex_file1->GetStringData(dex_file1->GetStringId(dex::StringIndex(0))));
StringReference sr1(dex_file1.get(), dex::StringIndex(0));
TestDexFileBuilder builder2;
builder2.AddString("String2");
std::unique_ptr<const DexFile> dex_file2 = builder2.Build("fake location 2");
ASSERT_EQ(1u, dex_file2->NumStringIds());
ASSERT_STREQ("String2", dex_file2->GetStringData(dex_file2->GetStringId(dex::StringIndex(0))));
StringReference sr2(dex_file2.get(), dex::StringIndex(0));
StringReferenceValueComparator cmp;
EXPECT_TRUE(cmp(sr1, sr2)); // "String1" < "String2" is true.
EXPECT_FALSE(cmp(sr2, sr1)); // "String2" < "String1" is false.
}
TEST(StringReference, ValueComparator2) {
const char* const kDexFile1Strings[] = {
"",
"abc",
"abcxyz",
};
const char* const kDexFile2Strings[] = {
"a",
"abc",
"abcdef",
"def",
};
const bool expectedCmp12[arraysize(kDexFile1Strings)][arraysize(kDexFile2Strings)] = {
{ true, true, true, true },
{ false, false, true, true },
{ false, false, false, true },
};
const bool expectedCmp21[arraysize(kDexFile2Strings)][arraysize(kDexFile1Strings)] = {
{ false, true, true },
{ false, false, true },
{ false, false, true },
{ false, false, false },
};
TestDexFileBuilder builder1;
for (const char* s : kDexFile1Strings) {
builder1.AddString(s);
}
std::unique_ptr<const DexFile> dex_file1 = builder1.Build("fake location 1");
ASSERT_EQ(arraysize(kDexFile1Strings), dex_file1->NumStringIds());
for (size_t index = 0; index != arraysize(kDexFile1Strings); ++index) {
ASSERT_STREQ(kDexFile1Strings[index],
dex_file1->GetStringData(dex_file1->GetStringId(dex::StringIndex(index))));
}
TestDexFileBuilder builder2;
for (const char* s : kDexFile2Strings) {
builder2.AddString(s);
}
std::unique_ptr<const DexFile> dex_file2 = builder2.Build("fake location 1");
ASSERT_EQ(arraysize(kDexFile2Strings), dex_file2->NumStringIds());
for (size_t index = 0; index != arraysize(kDexFile2Strings); ++index) {
ASSERT_STREQ(kDexFile2Strings[index],
dex_file2->GetStringData(dex_file2->GetStringId(dex::StringIndex(index))));
}
StringReferenceValueComparator cmp;
for (size_t index1 = 0; index1 != arraysize(kDexFile1Strings); ++index1) {
for (size_t index2 = 0; index2 != arraysize(kDexFile2Strings); ++index2) {
StringReference sr1(dex_file1.get(), dex::StringIndex(index1));
StringReference sr2(dex_file2.get(), dex::StringIndex(index2));
EXPECT_EQ(expectedCmp12[index1][index2], cmp(sr1, sr2)) << index1 << " " << index2;
EXPECT_EQ(expectedCmp21[index2][index1], cmp(sr2, sr1)) << index1 << " " << index2;
}
}
}
} // namespace art