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//=-- lsan_thread.cc ------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of LeakSanitizer.
// See lsan_thread.h for details.
//
//===----------------------------------------------------------------------===//
#include "lsan_thread.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_placement_new.h"
#include "sanitizer_common/sanitizer_thread_registry.h"
#include "sanitizer_common/sanitizer_tls_get_addr.h"
#include "lsan_allocator.h"
namespace __lsan {
const u32 kInvalidTid = (u32) -1;
static ThreadRegistry *thread_registry;
static THREADLOCAL u32 current_thread_tid = kInvalidTid;
static ThreadContextBase *CreateThreadContext(u32 tid) {
void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
return new(mem) ThreadContext(tid);
}
static const uptr kMaxThreads = 1 << 13;
static const uptr kThreadQuarantineSize = 64;
void InitializeThreadRegistry() {
static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
thread_registry = new(thread_registry_placeholder)
ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
}
u32 GetCurrentThread() {
return current_thread_tid;
}
void SetCurrentThread(u32 tid) {
current_thread_tid = tid;
}
ThreadContext::ThreadContext(int tid)
: ThreadContextBase(tid),
stack_begin_(0),
stack_end_(0),
cache_begin_(0),
cache_end_(0),
tls_begin_(0),
tls_end_(0),
dtls_(nullptr) {}
struct OnStartedArgs {
uptr stack_begin, stack_end,
cache_begin, cache_end,
tls_begin, tls_end;
DTLS *dtls;
};
void ThreadContext::OnStarted(void *arg) {
OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
stack_begin_ = args->stack_begin;
stack_end_ = args->stack_end;
tls_begin_ = args->tls_begin;
tls_end_ = args->tls_end;
cache_begin_ = args->cache_begin;
cache_end_ = args->cache_end;
dtls_ = args->dtls;
}
void ThreadContext::OnFinished() {
AllocatorThreadFinish();
DTLS_Destroy();
}
u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
return thread_registry->CreateThread(user_id, detached, parent_tid,
/* arg */ nullptr);
}
void ThreadStart(u32 tid, uptr os_id) {
OnStartedArgs args;
uptr stack_size = 0;
uptr tls_size = 0;
GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
&args.tls_begin, &tls_size);
args.stack_end = args.stack_begin + stack_size;
args.tls_end = args.tls_begin + tls_size;
GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
args.dtls = DTLS_Get();
thread_registry->StartThread(tid, os_id, &args);
}
void ThreadFinish() {
thread_registry->FinishThread(GetCurrentThread());
}
ThreadContext *CurrentThreadContext() {
if (!thread_registry) return nullptr;
if (GetCurrentThread() == kInvalidTid)
return nullptr;
// No lock needed when getting current thread.
return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
}
static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
uptr uid = (uptr)arg;
if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
return true;
}
return false;
}
u32 ThreadTid(uptr uid) {
return thread_registry->FindThread(FindThreadByUid, (void*)uid);
}
void ThreadJoin(u32 tid) {
CHECK_NE(tid, kInvalidTid);
thread_registry->JoinThread(tid, /* arg */nullptr);
}
void EnsureMainThreadIDIsCorrect() {
if (GetCurrentThread() == 0)
CurrentThreadContext()->os_id = GetTid();
}
///// Interface to the common LSan module. /////
bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
uptr *cache_end, DTLS **dtls) {
ThreadContext *context = static_cast<ThreadContext *>(
thread_registry->FindThreadContextByOsIDLocked(os_id));
if (!context) return false;
*stack_begin = context->stack_begin();
*stack_end = context->stack_end();
*tls_begin = context->tls_begin();
*tls_end = context->tls_end();
*cache_begin = context->cache_begin();
*cache_end = context->cache_end();
*dtls = context->dtls();
return true;
}
void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback,
void *arg) {
}
void LockThreadRegistry() {
thread_registry->Lock();
}
void UnlockThreadRegistry() {
thread_registry->Unlock();
}
} // namespace __lsan
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