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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 "core_jni_helpers.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 #define DDMS_HEADER_SIGNATURE 0x812345dd
39 #define DDMS_VERSION 2
40 
41 struct Header {
42 #if defined(__LP64__)
43     uint32_t signature;
44     uint16_t version;
45     uint16_t pointerSize;
46 #endif
47     size_t mapSize;
48     size_t allocSize;
49     size_t allocInfoSize;
50     size_t totalMemory;
51     size_t backtraceSize;
52 };
53 
54 namespace android {
55 
ReadFile(const char * path,String8 & s)56 static void ReadFile(const char* path, String8& s) {
57     int fd = open(path, O_RDONLY);
58     if (fd != -1) {
59         char bytes[1024];
60         ssize_t byteCount;
61         while ((byteCount = TEMP_FAILURE_RETRY(read(fd, bytes, sizeof(bytes)))) > 0) {
62             s.append(bytes, byteCount);
63         }
64         close(fd);
65     }
66 }
67 
68 /*
69  * Retrieve the native heap information and the info from /proc/self/maps,
70  * copy them into a byte[] with a "struct Header" that holds data offsets,
71  * and return the array.
72  */
DdmHandleNativeHeap_getLeakInfo(JNIEnv * env,jobject)73 static jbyteArray DdmHandleNativeHeap_getLeakInfo(JNIEnv* env, jobject) {
74     Header header;
75     memset(&header, 0, sizeof(header));
76 
77     String8 maps;
78     ReadFile("/proc/self/maps", maps);
79     header.mapSize = maps.size();
80 
81     uint8_t* allocBytes;
82     get_malloc_leak_info(&allocBytes, &header.allocSize, &header.allocInfoSize,
83                          &header.totalMemory, &header.backtraceSize);
84 
85     ALOGD("*** mapSize: %zu allocSize: %zu allocInfoSize: %zu totalMemory: %zu",
86           header.mapSize, header.allocSize, header.allocInfoSize, header.totalMemory);
87 
88 #if defined(__LP64__)
89     header.signature = DDMS_HEADER_SIGNATURE;
90     header.version = DDMS_VERSION;
91     header.pointerSize = sizeof(void*);
92 #endif
93 
94     jbyteArray array = env->NewByteArray(sizeof(Header) + header.mapSize + header.allocSize);
95     if (array != NULL) {
96         env->SetByteArrayRegion(array, 0,
97                                 sizeof(header), reinterpret_cast<jbyte*>(&header));
98         env->SetByteArrayRegion(array, sizeof(header),
99                                 maps.size(), reinterpret_cast<const jbyte*>(maps.string()));
100         env->SetByteArrayRegion(array, sizeof(header) + maps.size(),
101                                 header.allocSize, reinterpret_cast<jbyte*>(allocBytes));
102     }
103 
104     free_malloc_leak_info(allocBytes);
105     return array;
106 }
107 
108 static const JNINativeMethod method_table[] = {
109     { "getLeakInfo", "()[B", (void*) DdmHandleNativeHeap_getLeakInfo },
110 };
111 
register_android_ddm_DdmHandleNativeHeap(JNIEnv * env)112 int register_android_ddm_DdmHandleNativeHeap(JNIEnv* env) {
113     return RegisterMethodsOrDie(env, "android/ddm/DdmHandleNativeHeap", method_table,
114                                 NELEM(method_table));
115 }
116 
117 };
118