1/* //device/libs/android_runtime/android_util_Log.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_NAMESPACE "log.tag."
19#define LOG_TAG "Log_println"
20
21#include <android-base/macros.h>
22#include <assert.h>
23#include <cutils/properties.h>
24#include <log/log.h>               // For LOGGER_ENTRY_MAX_PAYLOAD.
25#include <utils/Log.h>
26#include <utils/String8.h>
27
28#include "jni.h"
29#include "JNIHelp.h"
30#include "utils/misc.h"
31#include "core_jni_helpers.h"
32#include "android_util_Log.h"
33
34namespace android {
35
36struct levels_t {
37    jint verbose;
38    jint debug;
39    jint info;
40    jint warn;
41    jint error;
42    jint assert;
43};
44static levels_t levels;
45
46static jboolean isLoggable(const char* tag, jint level) {
47    return __android_log_is_loggable(level, tag, ANDROID_LOG_INFO);
48}
49
50static jboolean android_util_Log_isLoggable(JNIEnv* env, jobject clazz, jstring tag, jint level)
51{
52    if (tag == NULL) {
53        return false;
54    }
55
56    const char* chars = env->GetStringUTFChars(tag, NULL);
57    if (!chars) {
58        return false;
59    }
60
61    jboolean result = isLoggable(chars, level);
62
63    env->ReleaseStringUTFChars(tag, chars);
64    return result;
65}
66
67bool android_util_Log_isVerboseLogEnabled(const char* tag) {
68    return isLoggable(tag, levels.verbose);
69}
70
71/*
72 * In class android.util.Log:
73 *  public static native int println_native(int buffer, int priority, String tag, String msg)
74 */
75static jint android_util_Log_println_native(JNIEnv* env, jobject clazz,
76        jint bufID, jint priority, jstring tagObj, jstring msgObj)
77{
78    const char* tag = NULL;
79    const char* msg = NULL;
80
81    if (msgObj == NULL) {
82        jniThrowNullPointerException(env, "println needs a message");
83        return -1;
84    }
85
86    if (bufID < 0 || bufID >= LOG_ID_MAX) {
87        jniThrowNullPointerException(env, "bad bufID");
88        return -1;
89    }
90
91    if (tagObj != NULL)
92        tag = env->GetStringUTFChars(tagObj, NULL);
93    msg = env->GetStringUTFChars(msgObj, NULL);
94
95    int res = __android_log_buf_write(bufID, (android_LogPriority)priority, tag, msg);
96
97    if (tag != NULL)
98        env->ReleaseStringUTFChars(tagObj, tag);
99    env->ReleaseStringUTFChars(msgObj, msg);
100
101    return res;
102}
103
104/*
105 * In class android.util.Log:
106 *  private static native int logger_entry_max_payload_native()
107 */
108static jint android_util_Log_logger_entry_max_payload_native(JNIEnv* env ATTRIBUTE_UNUSED,
109                                                             jobject clazz ATTRIBUTE_UNUSED)
110{
111    return static_cast<jint>(LOGGER_ENTRY_MAX_PAYLOAD);
112}
113
114/*
115 * JNI registration.
116 */
117static const JNINativeMethod gMethods[] = {
118    /* name, signature, funcPtr */
119    { "isLoggable",      "(Ljava/lang/String;I)Z", (void*) android_util_Log_isLoggable },
120    { "println_native",  "(IILjava/lang/String;Ljava/lang/String;)I", (void*) android_util_Log_println_native },
121    { "logger_entry_max_payload_native",  "()I", (void*) android_util_Log_logger_entry_max_payload_native },
122};
123
124int register_android_util_Log(JNIEnv* env)
125{
126    jclass clazz = FindClassOrDie(env, "android/util/Log");
127
128    levels.verbose = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "VERBOSE", "I"));
129    levels.debug = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "DEBUG", "I"));
130    levels.info = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "INFO", "I"));
131    levels.warn = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "WARN", "I"));
132    levels.error = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ERROR", "I"));
133    levels.assert = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ASSERT", "I"));
134
135    return RegisterMethodsOrDie(env, "android/util/Log", gMethods, NELEM(gMethods));
136}
137
138}; // namespace android
139