Prefetch the native library from native code by parsing /proc/pid/maps.

base/android/library_loader/library_prefetcher_unittest.cc

+// Copyright 2015 The Chromium 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 "base/android/library_loader/library_prefetcher.h"
+
+#include <string>
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace android {
+
+TEST(NativeLibraryPrefetcherTest, TestParseLine32Bits) {
+  const std::string line(
+      "b6e62000-b6e64000 r-xp 00000000 b3:15 1204   /lib/libstdc++.so\n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  EXPECT_EQ(mapping.start, UINT64_C(0xb6e62000));
+  EXPECT_EQ(mapping.end, UINT64_C(0xb6e64000));
+  EXPECT_EQ(mapping.flags, "r-xp");
+  EXPECT_EQ(mapping.filename, "/lib/libstdc++.so");
+}
+
+TEST(NativeLibraryPrefetcherTest, TestParseLine64Bits) {
+  const std::string line(
+      "800000b6e62000-800000b6e64000 r-xp 00000000 b3:15 1204 libstdc++.so\n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  EXPECT_EQ(mapping.start, UINT64_C(0x800000b6e62000));
+  EXPECT_EQ(mapping.end, UINT64_C(0x800000b6e64000));
+  EXPECT_EQ(mapping.flags, "r-xp");
+  EXPECT_EQ(mapping.filename, "libstdc++.so");
+}
+
+TEST(NativeLibraryPrefetcherTest, TestParseLineNoFile) {
+  const std::string line("b6e62000-b6e64000 r-xp 00000000 b3:15 1204 \n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  EXPECT_EQ(mapping.start, UINT64_C(0xb6e62000));
+  EXPECT_EQ(mapping.end, UINT64_C(0xb6e64000));
+  EXPECT_EQ(mapping.flags, "r-xp");
+  EXPECT_EQ(mapping.filename, "");
+}
+
+TEST(NativeLibraryPrefetcherTest, TestIsGoodToPrefetchNoRange) {
+  const std::string lines[4] = {
+      "800000b6e62000-800000b6e64000 r-xp 00000000 b3:15 1204 \n",
+      "800000b6e62000-800000b6e64000 r-xp 00000000 b3:15 1204 foo\n",
+      "800000b6e62000-800000b6e64000 r-xp 00000000 b3:15 1204 foobar.apk\n",
+      "800000b6e62000-800000b6e64000 r-xp 00000000 b3:15 1204 \n"
+      "libchromium.so\n"};
+  for (int i = 0; i < 4; ++i) {
+    NativeLibraryPrefetcher::Mapping mapping;
+    ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(lines[i], &mapping));
+    ASSERT_FALSE(NativeLibraryPrefetcher::IsGoodToPrefetch(mapping));
+  }
+}
+
+TEST(NativeLibraryPrefetcherTest, TestIsGoodToPrefetchUnreadableRange) {
+  const std::string line(
+      "800000b6e62000-800000b6e64000 --xp 00000000 b3:15 1204 base.apk\n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  ASSERT_FALSE(NativeLibraryPrefetcher::IsGoodToPrefetch(mapping));
+}
+
+TEST(NativeLibraryPrefetcherTest, TestIsGoodToPrefetchSkipSharedRange) {
+  const std::string line(
+      "800000b6e62000-800000b6e64000 r-xs 00000000 b3:15 1204 base.apk\n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  ASSERT_FALSE(NativeLibraryPrefetcher::IsGoodToPrefetch(mapping));
+}
+
+TEST(NativeLibraryPrefetcherTest, TestIsGoodToPrefetchLibchromeRange) {
+  const std::string line("42-43 r-xp 00000000 b3:15 42 libchrome.so\n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  ASSERT_TRUE(NativeLibraryPrefetcher::IsGoodToPrefetch(mapping));
+}
+
+TEST(NativeLibraryPrefetcherTest, TestIsGoodToPrefetchBaseApkRange) {
+  const std::string line("42-43 rw-p 00000000 b3:15 1204 base.apk\n");
+  NativeLibraryPrefetcher::Mapping mapping;
+  ASSERT_TRUE(NativeLibraryPrefetcher::ParseMapping(line, &mapping));
+  ASSERT_TRUE(NativeLibraryPrefetcher::IsGoodToPrefetch(mapping));
+}
+
+}  // namespace android
+}  // namespace base