1 /*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "SQLiteDebug"
18
19 #include <jni.h>
20 #include <JNIHelp.h>
21 #include <android_runtime/AndroidRuntime.h>
22
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <utils/Log.h>
28
29 #include <sqlite3.h>
30
31 namespace android {
32
33 static struct {
34 jfieldID memoryUsed;
35 jfieldID pageCacheOverflow;
36 jfieldID largestMemAlloc;
37 } gSQLiteDebugPagerStatsClassInfo;
38
nativeGetPagerStats(JNIEnv * env,jobject clazz,jobject statsObj)39 static void nativeGetPagerStats(JNIEnv *env, jobject clazz, jobject statsObj)
40 {
41 int memoryUsed;
42 int pageCacheOverflow;
43 int largestMemAlloc;
44 int unused;
45
46 sqlite3_status(SQLITE_STATUS_MEMORY_USED, &memoryUsed, &unused, 0);
47 sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &unused, &largestMemAlloc, 0);
48 sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &pageCacheOverflow, &unused, 0);
49 env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.memoryUsed, memoryUsed);
50 env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow,
51 pageCacheOverflow);
52 env->SetIntField(statsObj, gSQLiteDebugPagerStatsClassInfo.largestMemAlloc, largestMemAlloc);
53 }
54
55 /*
56 * JNI registration.
57 */
58
59 static JNINativeMethod gMethods[] =
60 {
61 { "nativeGetPagerStats", "(Landroid/database/sqlite/SQLiteDebug$PagerStats;)V",
62 (void*) nativeGetPagerStats },
63 };
64
65 #define FIND_CLASS(var, className) \
66 var = env->FindClass(className); \
67 LOG_FATAL_IF(! var, "Unable to find class " className);
68
69 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
70 var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
71 LOG_FATAL_IF(! var, "Unable to find field " fieldName);
72
register_android_database_SQLiteDebug(JNIEnv * env)73 int register_android_database_SQLiteDebug(JNIEnv *env)
74 {
75 jclass clazz;
76 FIND_CLASS(clazz, "android/database/sqlite/SQLiteDebug$PagerStats");
77
78 GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.memoryUsed, clazz,
79 "memoryUsed", "I");
80 GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.largestMemAlloc, clazz,
81 "largestMemAlloc", "I");
82 GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow, clazz,
83 "pageCacheOverflow", "I");
84
85 return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteDebug",
86 gMethods, NELEM(gMethods));
87 }
88
89 } // namespace android
90