Fix StringReferenceValueComparator.
Test: Added a regression test in string_reference_test.cc,
run the standard ART test suite on host and Nexus 5.
Bug: 29602109
Change-Id: Idcc059a07df048a0e3ece257b16b6556f242243e
diff --git a/compiler/utils/string_reference_test.cc b/compiler/utils/string_reference_test.cc
new file mode 100644
index 0000000..df5080e
--- /dev/null
+++ b/compiler/utils/string_reference_test.cc
@@ -0,0 +1,107 @@
+/*
+ * 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 "utils/string_reference.h"
+
+#include <memory>
+
+#include "gtest/gtest.h"
+#include "utils/test_dex_file_builder.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("dummy location 1");
+ ASSERT_EQ(1u, dex_file1->NumStringIds());
+ ASSERT_STREQ("String1", dex_file1->GetStringData(dex_file1->GetStringId(0)));
+ StringReference sr1(dex_file1.get(), 0);
+
+ TestDexFileBuilder builder2;
+ builder2.AddString("String2");
+ std::unique_ptr<const DexFile> dex_file2 = builder2.Build("dummy location 2");
+ ASSERT_EQ(1u, dex_file2->NumStringIds());
+ ASSERT_STREQ("String2", dex_file2->GetStringData(dex_file2->GetStringId(0)));
+ StringReference sr2(dex_file2.get(), 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("dummy 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(index)));
+ }
+
+ TestDexFileBuilder builder2;
+ for (const char* s : kDexFile2Strings) {
+ builder2.AddString(s);
+ }
+ std::unique_ptr<const DexFile> dex_file2 = builder2.Build("dummy 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(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(), index1);
+ StringReference sr2(dex_file2.get(), index2);
+ EXPECT_EQ(expectedCmp12[index1][index2], cmp(sr1, sr2)) << index1 << " " << index2;
+ EXPECT_EQ(expectedCmp21[index2][index1], cmp(sr2, sr1)) << index1 << " " << index2;
+ }
+ }
+}
+
+} // namespace art