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/*
* Copyright 2011, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <media/MemoryLeakTrackUtil.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
/*
* The code here originally resided in MediaPlayerService.cpp and was
* shamelessly copied over to support memory leak tracking from
* multiple places.
*/
namespace android {
#if defined(__arm__)
extern "C" void get_malloc_leak_info(uint8_t** info, size_t* overallSize,
size_t* infoSize, size_t* totalMemory, size_t* backtraceSize);
extern "C" void free_malloc_leak_info(uint8_t* info);
// Use the String-class below instead of String8 to allocate all memory
// beforehand and not reenter the heap while we are examining it...
struct MyString8 {
static const size_t MAX_SIZE = 256 * 1024;
MyString8()
: mPtr((char *)malloc(MAX_SIZE)) {
*mPtr = '\0';
}
~MyString8() {
free(mPtr);
}
void append(const char *s) {
strcat(mPtr, s);
}
const char *string() const {
return mPtr;
}
size_t size() const {
return strlen(mPtr);
}
private:
char *mPtr;
MyString8(const MyString8 &);
MyString8 &operator=(const MyString8 &);
};
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);
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");
}
delete[] entries;
free_malloc_leak_info(info);
}
write(fd, result.string(), result.size());
}
#else
// Does nothing
void dumpMemoryAddresses(int fd) {}
#endif
} // namespace android
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