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 <nativehelper/JNIHelp.h>
30 #include "utils/misc.h"
31 #include "core_jni_helpers.h"
32 #include "android_util_Log.h"
33
34 namespace android {
35
36 struct levels_t {
37 jint verbose;
38 jint debug;
39 jint info;
40 jint warn;
41 jint error;
42 jint assert;
43 };
44 static levels_t levels;
45
isLoggable(const char * tag,jint level)46 static jboolean isLoggable(const char* tag, jint level) {
47 return __android_log_is_loggable(level, tag, ANDROID_LOG_INFO);
48 }
49
android_util_Log_isLoggable(JNIEnv * env,jobject clazz,jstring tag,jint level)50 static 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
android_util_Log_isVerboseLogEnabled(const char * tag)67 bool 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 */
android_util_Log_println_native(JNIEnv * env,jobject clazz,jint bufID,jint priority,jstring tagObj,jstring msgObj)75 static 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 */
android_util_Log_logger_entry_max_payload_native(JNIEnv * env ATTRIBUTE_UNUSED,jobject clazz ATTRIBUTE_UNUSED)108 static 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 */
117 static 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
register_android_util_Log(JNIEnv * env)124 int 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