/*
* Retrieve the native heap information and the info from /proc/self/maps,
* copy them into a byte[] with a "struct Header" that holds data offsets,
* and return the array.
*/
static jbyteArray DdmHandleNativeHeap_getLeakInfo(JNIEnv* env, jobject) {
Header header;
memset(&header, 0, sizeof(header));
String8 maps;
ReadFile("/proc/self/maps", maps);
header.mapSize = maps.size();
uint8_t* allocBytes;
get_malloc_leak_info(&allocBytes, &header.allocSize, &header.allocInfoSize,
&header.totalMemory, &header.backtraceSize);
ALOGD("*** mapSize: %zu allocSize: %zu allocInfoSize: %zu totalMemory: %zu",
header.mapSize, header.allocSize, header.allocInfoSize, header.totalMemory);
#if defined(__LP64__)
header.signature = DDMS_HEADER_SIGNATURE;
header.version = DDMS_VERSION;
header.pointerSize = sizeof(void*);
#endif
jbyteArray array = env->NewByteArray(sizeof(Header) + header.mapSize + header.allocSize);
if (array != NULL) {
env->SetByteArrayRegion(array, 0,
sizeof(header), reinterpret_cast<jbyte*>(&header));
env->SetByteArrayRegion(array, sizeof(header),
maps.size(), reinterpret_cast<const jbyte*>(maps.string()));
env->SetByteArrayRegion(array, sizeof(header) + maps.size(),
header.allocSize, reinterpret_cast<jbyte*>(allocBytes));
}
free_malloc_leak_info(allocBytes);
return array;
}
/*
* Retrieve the native heap information and the info from /proc/<self>/maps,
* copy them into a byte[] with a "struct Header" that holds data offsets,
* and return the array.
*/
static jbyteArray getLeakInfo(JNIEnv *env, jobject clazz)
{
#if defined(__arm__)
// get the info in /proc/[pid]/map
Header header;
memset(&header, 0, sizeof(header));
pid_t pid = getpid();
char path[FILENAME_MAX];
sprintf(path, "/proc/%d/maps", pid);
struct stat sb;
int ret = stat(path, &sb);
uint8_t* mapsFile = NULL;
if (ret == 0) {
mapsFile = (uint8_t*)malloc(MAPS_FILE_SIZE);
int fd = open(path, O_RDONLY);
if (mapsFile != NULL && fd != -1) {
int amount = 0;
do {
uint8_t* ptr = mapsFile + header.mapSize;
amount = read(fd, ptr, MAPS_FILE_SIZE);
if (amount <= 0) {
if (errno != EINTR)
break;
else
continue;
}
header.mapSize += amount;
} while (header.mapSize < MAPS_FILE_SIZE);
LOGD("**** read %d bytes from '%s'", (int) header.mapSize, path);
}
}
uint8_t* allocBytes;
get_malloc_leak_info(&allocBytes, &header.allocSize, &header.allocInfoSize,
&header.totalMemory, &header.backtraceSize);
jbyte* bytes = NULL;
jbyte* ptr = NULL;
jbyteArray array = env->NewByteArray(sizeof(Header) + header.mapSize + header.allocSize);
if (array == NULL) {
goto done;
}
bytes = env->GetByteArrayElements(array, NULL);
ptr = bytes;
// LOGD("*** mapSize: %d allocSize: %d allocInfoSize: %d totalMemory: %d",
// header.mapSize, header.allocSize, header.allocInfoSize, header.totalMemory);
memcpy(ptr, &header, sizeof(header));
ptr += sizeof(header);
if (header.mapSize > 0 && mapsFile != NULL) {
memcpy(ptr, mapsFile, header.mapSize);
ptr += header.mapSize;
}
memcpy(ptr, allocBytes, header.allocSize);
env->ReleaseByteArrayElements(array, bytes, 0);
done:
if (mapsFile != NULL) {
free(mapsFile);
}
// free the info up!
free_malloc_leak_info(allocBytes);
return array;
#else
return NULL;
#endif
}
void dumpMemoryAddresses(int fd)
{
const size_t SIZE = 256;
char buffer[SIZE];
MyString8 result;
typedef struct {
size_t size;
size_t dups;
intptr_t * backtrace;
} AllocEntry;
uint8_t *info = NULL;
size_t overallSize = 0;
size_t infoSize = 0;
size_t totalMemory = 0;
size_t backtraceSize = 0;
get_malloc_leak_info(&info, &overallSize, &infoSize, &totalMemory, &backtraceSize);
if (info) {
uint8_t *ptr = info;
size_t count = overallSize / infoSize;
snprintf(buffer, SIZE, " Allocation count %i\n", count);
result.append(buffer);
snprintf(buffer, SIZE, " Total memory %i\n", totalMemory);
result.append(buffer);
AllocEntry * entries = new AllocEntry[count];
for (size_t i = 0; i < count; i++) {
// Each entry should be size_t, size_t, intptr_t[backtraceSize]
AllocEntry *e = &entries[i];
e->size = *reinterpret_cast<size_t *>(ptr);
ptr += sizeof(size_t);
e->dups = *reinterpret_cast<size_t *>(ptr);
ptr += sizeof(size_t);
e->backtrace = reinterpret_cast<intptr_t *>(ptr);
ptr += sizeof(intptr_t) * backtraceSize;
}
// Now we need to sort the entries. They come sorted by size but
// not by stack trace which causes problems using diff.
bool moved;
do {
moved = false;
for (size_t i = 0; i < (count - 1); i++) {
AllocEntry *e1 = &entries[i];
AllocEntry *e2 = &entries[i+1];
bool swap = e1->size < e2->size;
if (e1->size == e2->size) {
for(size_t j = 0; j < backtraceSize; j++) {
if (e1->backtrace[j] == e2->backtrace[j]) {
continue;
}
swap = e1->backtrace[j] < e2->backtrace[j];
break;
}
}
if (swap) {
AllocEntry t = entries[i];
entries[i] = entries[i+1];
entries[i+1] = t;
moved = true;
}
}
} while (moved);
write(fd, result.string(), result.size());
result.clear();
for (size_t i = 0; i < count; i++) {
AllocEntry *e = &entries[i];
snprintf(buffer, SIZE, "size %8i, dup %4i, ", e->size, e->dups);
result.append(buffer);
for (size_t ct = 0; (ct < backtraceSize) && e->backtrace[ct]; ct++) {
if (ct) {
result.append(", ");
}
snprintf(buffer, SIZE, "0x%08x", e->backtrace[ct]);
result.append(buffer);
}
result.append("\n");
write(fd, result.string(), result.size());
result.clear();
}
delete[] entries;
free_malloc_leak_info(info);
}
}
/*
* The get_malloc_leak_info() call returns an array of structs that
* look like this:
*
* size_t size
* size_t allocations
* intptr_t backtrace[32]
*
* "size" is the size of the allocation, "backtrace" is a fixed-size
* array of function pointers, and "allocations" is the number of
* allocations with the exact same size and backtrace.
*
* The entries are sorted by descending total size (i.e. size*allocations)
* then allocation count. For best results with "diff" we'd like to sort
* primarily by individual size then stack trace. Since the entries are
* fixed-size, and we're allowed (by the current implementation) to mangle
* them, we can do this in place.
*/
static void dumpNativeHeap(FILE* fp)
{
uint8_t* info = NULL;
size_t overallSize, infoSize, totalMemory, backtraceSize;
get_malloc_leak_info(&info, &overallSize, &infoSize, &totalMemory,
&backtraceSize);
if (info == NULL) {
fprintf(fp, "Native heap dump not available. To enable, run these"
" commands (requires root):\n");
fprintf(fp, "$ adb shell setprop libc.debug.malloc 1\n");
fprintf(fp, "$ adb shell stop\n");
fprintf(fp, "$ adb shell start\n");
return;
}
assert(infoSize != 0);
assert(overallSize % infoSize == 0);
fprintf(fp, "Android Native Heap Dump v1.0\n\n");
size_t recordCount = overallSize / infoSize;
fprintf(fp, "Total memory: %zu\n", totalMemory);
fprintf(fp, "Allocation records: %zd\n", recordCount);
if (backtraceSize != BACKTRACE_SIZE) {
fprintf(fp, "WARNING: mismatched backtrace sizes (%d vs. %d)\n",
backtraceSize, BACKTRACE_SIZE);
}
fprintf(fp, "\n");
/* re-sort the entries */
qsort(info, recordCount, infoSize, compareHeapRecords);
/* dump the entries to the file */
const uint8_t* ptr = info;
for (size_t idx = 0; idx < recordCount; idx++) {
size_t size = *(size_t*) ptr;
size_t allocations = *(size_t*) (ptr + sizeof(size_t));
intptr_t* backtrace = (intptr_t*) (ptr + sizeof(size_t) * 2);
fprintf(fp, "z %d sz %8zu num %4zu bt",
(size & SIZE_FLAG_ZYGOTE_CHILD) != 0,
size & ~SIZE_FLAG_ZYGOTE_CHILD,
allocations);
for (size_t bt = 0; bt < backtraceSize; bt++) {
if (backtrace[bt] == 0) {
break;
} else {
fprintf(fp, " %08x", backtrace[bt]);
}
}
fprintf(fp, "\n");
ptr += infoSize;
}
free_malloc_leak_info(info);
fprintf(fp, "MAPS\n");
const char* maps = "/proc/self/maps";
FILE* in = fopen(maps, "r");
if (in == NULL) {
fprintf(fp, "Could not open %s\n", maps);
return;
}
char buf[BUFSIZ];
while (size_t n = fread(buf, sizeof(char), BUFSIZ, in)) {
fwrite(buf, sizeof(char), n, fp);
}
fclose(in);
fprintf(fp, "END\n");
}