mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
80 lines
3.4 KiB
C
80 lines
3.4 KiB
C
|
// 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.
|
||
|
|
|
||
|
|
#ifndef BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
|
||
|
|
#define BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
|
||
|
|
|
||
|
|
#include <jni.h>
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include "base/debug/proc_maps_linux.h"
|
||
|
|
#include "base/gtest_prod_util.h"
|
||
|
|
#include "base/macros.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
namespace android {
|
||
|
|
|
||
|
|
// Forks and waits for a process prefetching the native library. This is done in
|
||
|
|
// a forked process for the following reasons:
|
||
|
|
// - Isolating the main process from mistakes in the parsing. If the parsing
|
||
|
|
// returns an incorrect address, only the forked process will crash.
|
||
|
|
// - Not inflating the memory used by the main process uselessly, which could
|
||
|
|
// increase its likelihood to be killed.
|
||
|
|
// The forked process has background priority and, since it is not declared to
|
||
|
|
// the Android runtime, can be killed at any time, which is not an issue here.
|
||
|
|
class BASE_EXPORT NativeLibraryPrefetcher {
|
||
|
|
public:
|
||
|
|
// Finds the ranges matching the native library, forks a low priority
|
||
|
|
// process pre-fetching these ranges and wait()s for it.
|
||
|
|
// Returns true for success.
|
||
|
|
static bool ForkAndPrefetchNativeLibrary();
|
||
|
|
// Returns the percentage of the native library code currently resident in
|
||
|
|
// memory, or -1 in case of error.
|
||
|
|
static int PercentageOfResidentNativeLibraryCode();
|
||
|
|
|
||
|
|
private:
|
||
|
|
using AddressRange = std::pair<uintptr_t, uintptr_t>;
|
||
|
|
// Returns true if the region matches native code or data.
|
||
|
|
static bool IsGoodToPrefetch(const base::debug::MappedMemoryRegion& region);
|
||
|
|
// Filters the regions to keep only libchrome ranges if possible.
|
||
|
|
static void FilterLibchromeRangesOnlyIfPossible(
|
||
|
|
const std::vector<base::debug::MappedMemoryRegion>& regions,
|
||
|
|
std::vector<AddressRange>* ranges);
|
||
|
|
// Finds the ranges matching the native library in /proc/self/maps.
|
||
|
|
// Returns true for success.
|
||
|
|
static bool FindRanges(std::vector<AddressRange>* ranges);
|
||
|
|
|
||
|
|
// Returns the percentage of the given address ranges currently resident in
|
||
|
|
// memory, or -1 in case of error.
|
||
|
|
static int PercentageOfResidentCode(const std::vector<AddressRange>& ranges);
|
||
|
|
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestIsGoodToPrefetchNoRange);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestIsGoodToPrefetchUnreadableRange);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestIsGoodToPrefetchSkipSharedRange);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestIsGoodToPrefetchLibchromeRange);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestIsGoodToPrefetchBaseApkRange);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestFilterLibchromeRangesOnlyIfPossibleNoLibchrome);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestFilterLibchromeRangesOnlyIfPossibleHasLibchrome);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestPercentageOfResidentCode);
|
||
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
||
|
|
TestPercentageOfResidentCodeTwoRegions);
|
||
|
|
|
||
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(NativeLibraryPrefetcher);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace android
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
|