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      1 /* //device/libs/android_runtime/android_ddm_DdmHandleNativeHeap.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 #undef LOG_TAG
     19 #define LOG_TAG "DdmHandleNativeHeap"
     20 
     21 #include <JNIHelp.h>
     22 #include <jni.h>
     23 #include <android_runtime/AndroidRuntime.h>
     24 
     25 #include <utils/Log.h>
     26 #include <utils/String8.h>
     27 
     28 #include <fcntl.h>
     29 #include <errno.h>
     30 #include <sys/types.h>
     31 #include <sys/stat.h>
     32 
     33 extern "C" void get_malloc_leak_info(uint8_t** info, size_t* overallSize,
     34                                      size_t* infoSize, size_t* totalMemory, size_t* backtraceSize);
     35 
     36 extern "C" void free_malloc_leak_info(uint8_t* info);
     37 
     38 struct Header {
     39     size_t mapSize;
     40     size_t allocSize;
     41     size_t allocInfoSize;
     42     size_t totalMemory;
     43     size_t backtraceSize;
     44 };
     45 
     46 namespace android {
     47 
     48 static void ReadFile(const char* path, String8& s) {
     49     int fd = open(path, O_RDONLY);
     50     if (fd != -1) {
     51         char bytes[1024];
     52         ssize_t byteCount;
     53         while ((byteCount = TEMP_FAILURE_RETRY(read(fd, bytes, sizeof(bytes)))) > 0) {
     54             s.append(bytes, byteCount);
     55         }
     56         close(fd);
     57     }
     58 }
     59 
     60 /*
     61  * Retrieve the native heap information and the info from /proc/self/maps,
     62  * copy them into a byte[] with a "struct Header" that holds data offsets,
     63  * and return the array.
     64  */
     65 static jbyteArray DdmHandleNativeHeap_getLeakInfo(JNIEnv* env, jobject) {
     66     Header header;
     67     memset(&header, 0, sizeof(header));
     68 
     69     String8 maps;
     70     ReadFile("/proc/self/maps", maps);
     71     header.mapSize = maps.size();
     72 
     73     uint8_t* allocBytes;
     74     get_malloc_leak_info(&allocBytes, &header.allocSize, &header.allocInfoSize,
     75                          &header.totalMemory, &header.backtraceSize);
     76 
     77     ALOGD("*** mapSize: %d allocSize: %d allocInfoSize: %d totalMemory: %d",
     78           header.mapSize, header.allocSize, header.allocInfoSize, header.totalMemory);
     79 
     80     jbyteArray array = env->NewByteArray(sizeof(Header) + header.mapSize + header.allocSize);
     81     if (array != NULL) {
     82         env->SetByteArrayRegion(array, 0,
     83                                 sizeof(header), reinterpret_cast<jbyte*>(&header));
     84         env->SetByteArrayRegion(array, sizeof(header),
     85                                 maps.size(), reinterpret_cast<const jbyte*>(maps.string()));
     86         env->SetByteArrayRegion(array, sizeof(header) + maps.size(),
     87                                 header.allocSize, reinterpret_cast<jbyte*>(allocBytes));
     88     }
     89 
     90     free_malloc_leak_info(allocBytes);
     91     return array;
     92 }
     93 
     94 static JNINativeMethod method_table[] = {
     95     { "getLeakInfo", "()[B", (void*) DdmHandleNativeHeap_getLeakInfo },
     96 };
     97 
     98 int register_android_ddm_DdmHandleNativeHeap(JNIEnv* env) {
     99     return AndroidRuntime::registerNativeMethods(env, "android/ddm/DdmHandleNativeHeap", method_table, NELEM(method_table));
    100 }
    101 
    102 };
    103