1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
// Copyright 2014 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_loader_hooks.h"
#include "base/android/command_line_android.h"
#include "base/android/jni_string.h"
#include "base/android/library_loader/library_load_from_apk_status_codes.h"
#include "base/android/library_loader/library_prefetcher.h"
#include "base/at_exit.h"
#include "base/metrics/histogram.h"
#include "jni/LibraryLoader_jni.h"
namespace base {
namespace android {
namespace {
base::AtExitManager* g_at_exit_manager = NULL;
const char* g_library_version_number = "";
LibraryLoadedHook* g_registration_callback = NULL;
enum RendererHistogramCode {
// Renderer load at fixed address success, fail, or not attempted.
// Renderers do not attempt to load at at fixed address if on a
// low-memory device on which browser load at fixed address has already
// failed.
LFA_SUCCESS = 0,
LFA_BACKOFF_USED = 1,
LFA_NOT_ATTEMPTED = 2,
// End sentinel, also used as nothing-pending indicator.
MAX_RENDERER_HISTOGRAM_CODE = 3,
NO_PENDING_HISTOGRAM_CODE = MAX_RENDERER_HISTOGRAM_CODE
};
enum BrowserHistogramCode {
// Non-low-memory random address browser loads.
NORMAL_LRA_SUCCESS = 0,
// Low-memory browser loads at fixed address, success or fail.
LOW_MEMORY_LFA_SUCCESS = 1,
LOW_MEMORY_LFA_BACKOFF_USED = 2,
MAX_BROWSER_HISTOGRAM_CODE = 3,
};
RendererHistogramCode g_renderer_histogram_code = NO_PENDING_HISTOGRAM_CODE;
} // namespace
static void RegisterChromiumAndroidLinkerRendererHistogram(
JNIEnv* env,
jobject jcaller,
jboolean requested_shared_relro,
jboolean load_at_fixed_address_failed) {
// Note a pending histogram value for later recording.
if (requested_shared_relro) {
g_renderer_histogram_code = load_at_fixed_address_failed
? LFA_BACKOFF_USED : LFA_SUCCESS;
} else {
g_renderer_histogram_code = LFA_NOT_ATTEMPTED;
}
}
void RecordChromiumAndroidLinkerRendererHistogram() {
if (g_renderer_histogram_code == NO_PENDING_HISTOGRAM_CODE)
return;
// Record and release the pending histogram value.
UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.RendererStates",
g_renderer_histogram_code,
MAX_RENDERER_HISTOGRAM_CODE);
g_renderer_histogram_code = NO_PENDING_HISTOGRAM_CODE;
}
static void RecordChromiumAndroidLinkerBrowserHistogram(
JNIEnv* env,
jobject jcaller,
jboolean is_using_browser_shared_relros,
jboolean load_at_fixed_address_failed,
jint library_load_from_apk_status) {
// For low-memory devices, record whether or not we successfully loaded the
// browser at a fixed address. Otherwise just record a normal invocation.
BrowserHistogramCode histogram_code;
if (is_using_browser_shared_relros) {
histogram_code = load_at_fixed_address_failed
? LOW_MEMORY_LFA_BACKOFF_USED : LOW_MEMORY_LFA_SUCCESS;
} else {
histogram_code = NORMAL_LRA_SUCCESS;
}
UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.BrowserStates",
histogram_code,
MAX_BROWSER_HISTOGRAM_CODE);
// Record the device support for loading a library directly from the APK file.
UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.LibraryLoadFromApkStatus",
library_load_from_apk_status,
LIBRARY_LOAD_FROM_APK_STATUS_CODES_MAX);
}
void SetLibraryLoadedHook(LibraryLoadedHook* func) {
g_registration_callback = func;
}
static void InitCommandLine(JNIEnv* env,
jobject jcaller,
jobjectArray init_command_line) {
InitNativeCommandLineFromJavaArray(env, init_command_line);
}
static jboolean LibraryLoaded(JNIEnv* env, jobject jcaller) {
if (g_registration_callback == NULL) {
return true;
}
return g_registration_callback(env, NULL);
}
void LibraryLoaderExitHook() {
if (g_at_exit_manager) {
delete g_at_exit_manager;
g_at_exit_manager = NULL;
}
}
static jboolean ForkAndPrefetchNativeLibrary(JNIEnv* env, jclass clazz) {
return NativeLibraryPrefetcher::ForkAndPrefetchNativeLibrary();
}
bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
return RegisterNativesImpl(env);
}
void SetVersionNumber(const char* version_number) {
g_library_version_number = strdup(version_number);
}
jstring GetVersionNumber(JNIEnv* env, jobject jcaller) {
return ConvertUTF8ToJavaString(env, g_library_version_number).Release();
}
LibraryProcessType GetLibraryProcessType(JNIEnv* env) {
return static_cast<LibraryProcessType>(
Java_LibraryLoader_getLibraryProcessType(env));
}
void InitAtExitManager() {
g_at_exit_manager = new base::AtExitManager();
}
} // namespace android
} // namespace base
|
