extern "C" bool malloc_debug_initialize(HashTable* hash_table, const MallocDebug* malloc_dispatch) {
g_hash_table = hash_table;
g_malloc_dispatch = malloc_dispatch;
pthread_key_create(&g_debug_calls_disabled, NULL);
char debug_backlog[PROP_VALUE_MAX];
if (__system_property_get("libc.debug.malloc.backlog", debug_backlog)) {
g_malloc_debug_backlog = atoi(debug_backlog);
info_log("%s: setting backlog length to %d\n", getprogname(), g_malloc_debug_backlog);
}
// Check if backtracing should be disabled.
char env[PROP_VALUE_MAX];
if (__system_property_get("libc.debug.malloc.nobacktrace", env) && atoi(env) != 0) {
g_backtrace_enabled = false;
__libc_format_log(ANDROID_LOG_INFO, "libc", "not gathering backtrace information\n");
}
if (g_backtrace_enabled) {
backtrace_startup();
}
return true;
}
bool debug_initialize(const MallocDispatch* malloc_dispatch, int* malloc_zygote_child) {
if (malloc_zygote_child == nullptr) {
return false;
}
InitAtfork();
g_malloc_zygote_child = malloc_zygote_child;
g_dispatch = malloc_dispatch;
if (!DebugDisableInitialize()) {
return false;
}
DebugData* debug = new DebugData();
if (!debug->Initialize()) {
delete debug;
DebugDisableFinalize();
return false;
}
g_debug = debug;
// Always enable the backtrace code since we will use it in a number
// of different error cases.
backtrace_startup();
return true;
}
extern "C" int malloc_debug_initialize() {
backtrace_startup();
return 0;
}
static int traverseTree(MutexInfo* obj, MutexInfo const* objParent)
{
/*
* Have we been here before?
*/
if (obj->historyMark) {
int stackDepth;
uintptr_t addrs[STACK_TRACE_DEPTH];
/* Turn off prediction temporarily in this thread while logging */
sPthreadDebugDisabledThread = gettid();
backtrace_startup();
LOGW("%s\n", kStartBanner);
LOGW("pid: %d, tid: %d >>> %s <<<", getpid(), gettid(), __progname);
LOGW("Illegal lock attempt:\n");
LOGW("--- pthread_mutex_t at %p\n", obj->mutex);
stackDepth = get_backtrace(addrs, STACK_TRACE_DEPTH);
log_backtrace(addrs, stackDepth);
LOGW("+++ Currently held locks in this thread (in reverse order):");
MutexInfo* cur = obj;
pid_t ourtid = gettid();
int i;
for (i=0 ; i<cur->parents.count ; i++) {
MutexInfo* parent = cur->parents.list[i];
if (parent->owner == ourtid) {
LOGW("--- pthread_mutex_t at %p\n", parent->mutex);
if (sPthreadDebugLevel >= CAPTURE_CALLSTACK) {
log_backtrace(parent->stackTrace, parent->stackDepth);
}
cur = parent;
break;
}
}
LOGW("+++ Earlier, the following lock order (from last to first) was established\n");
return 0;
}
obj->historyMark = 1;
MutexInfoList* pList = &obj->children;
int result = 1;
int i;
for (i = pList->count-1; i >= 0; i--) {
MutexInfo* child = pList->list[i];
if (!traverseTree(child, obj)) {
LOGW("--- pthread_mutex_t at %p\n", obj->mutex);
if (sPthreadDebugLevel >= CAPTURE_CALLSTACK) {
int index = historyListHas(&obj->parents, objParent);
if ((size_t)index < (size_t)obj->stacks.count) {
log_backtrace(obj->stacks.stack[index].addrs, obj->stacks.stack[index].depth);
} else {
log_backtrace(obj->stackTrace, obj->stackDepth);
}
}
result = 0;
break;
}
}
obj->historyMark = 0;
return result;
}