android_util_Log.cpp revision 52eb4e01a49fe2e94555c000de38bbcbbb13401b
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 = false; 62 if ((strlen(chars)+sizeof(LOG_NAMESPACE)) > PROPERTY_KEY_MAX) { 63 char buf2[200]; 64 snprintf(buf2, sizeof(buf2), "Log tag \"%s\" exceeds limit of %zu characters\n", 65 chars, PROPERTY_KEY_MAX - sizeof(LOG_NAMESPACE)); 66 67 jniThrowException(env, "java/lang/IllegalArgumentException", buf2); 68 } else { 69 result = isLoggable(chars, level); 70 } 71 72 env->ReleaseStringUTFChars(tag, chars); 73 return result; 74} 75 76bool android_util_Log_isVerboseLogEnabled(const char* tag) { 77 return isLoggable(tag, levels.verbose); 78} 79 80/* 81 * In class android.util.Log: 82 * public static native int println_native(int buffer, int priority, String tag, String msg) 83 */ 84static jint android_util_Log_println_native(JNIEnv* env, jobject clazz, 85 jint bufID, jint priority, jstring tagObj, jstring msgObj) 86{ 87 const char* tag = NULL; 88 const char* msg = NULL; 89 90 if (msgObj == NULL) { 91 jniThrowNullPointerException(env, "println needs a message"); 92 return -1; 93 } 94 95 if (bufID < 0 || bufID >= LOG_ID_MAX) { 96 jniThrowNullPointerException(env, "bad bufID"); 97 return -1; 98 } 99 100 if (tagObj != NULL) 101 tag = env->GetStringUTFChars(tagObj, NULL); 102 msg = env->GetStringUTFChars(msgObj, NULL); 103 104 int res = __android_log_buf_write(bufID, (android_LogPriority)priority, tag, msg); 105 106 if (tag != NULL) 107 env->ReleaseStringUTFChars(tagObj, tag); 108 env->ReleaseStringUTFChars(msgObj, msg); 109 110 return res; 111} 112 113/* 114 * In class android.util.Log: 115 * private static native int logger_entry_max_payload_native() 116 */ 117static jint android_util_Log_logger_entry_max_payload_native(JNIEnv* env ATTRIBUTE_UNUSED, 118 jobject clazz ATTRIBUTE_UNUSED) 119{ 120 return static_cast<jint>(LOGGER_ENTRY_MAX_PAYLOAD); 121} 122 123/* 124 * JNI registration. 125 */ 126static const JNINativeMethod gMethods[] = { 127 /* name, signature, funcPtr */ 128 { "isLoggable", "(Ljava/lang/String;I)Z", (void*) android_util_Log_isLoggable }, 129 { "println_native", "(IILjava/lang/String;Ljava/lang/String;)I", (void*) android_util_Log_println_native }, 130 { "logger_entry_max_payload_native", "()I", (void*) android_util_Log_logger_entry_max_payload_native }, 131}; 132 133int register_android_util_Log(JNIEnv* env) 134{ 135 jclass clazz = FindClassOrDie(env, "android/util/Log"); 136 137 levels.verbose = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "VERBOSE", "I")); 138 levels.debug = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "DEBUG", "I")); 139 levels.info = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "INFO", "I")); 140 levels.warn = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "WARN", "I")); 141 levels.error = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ERROR", "I")); 142 levels.assert = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ASSERT", "I")); 143 144 return RegisterMethodsOrDie(env, "android/util/Log", gMethods, NELEM(gMethods)); 145} 146 147}; // namespace android 148