android_ddm_DdmHandleNativeHeap.cpp revision a480dafbf2f0c7e526ba44dcbb0d603470df2199 
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
33extern "C" void get_malloc_leak_info(uint8_t** info, size_t* overallSize,
34                                     size_t* infoSize, size_t* totalMemory, size_t* backtraceSize);
35
36extern "C" void free_malloc_leak_info(uint8_t* info);
37
38struct Header {
39    size_t mapSize;
40    size_t allocSize;
41    size_t allocInfoSize;
42    size_t totalMemory;
43    size_t backtraceSize;
44};
45
46namespace android {
47
48static 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 */
65static 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
94static JNINativeMethod method_table[] = {
95    { "getLeakInfo", "()[B", (void*) DdmHandleNativeHeap_getLeakInfo },
96};
97
98int register_android_ddm_DdmHandleNativeHeap(JNIEnv* env) {
99    return AndroidRuntime::registerNativeMethods(env, "android/ddm/DdmHandleNativeHeap", method_table, NELEM(method_table));
100}
101
102};
103