lsan_thread.cpp
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//=-- lsan_thread.cpp -----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of LeakSanitizer.
// See lsan_thread.h for details.
//
//===----------------------------------------------------------------------===//
#include "lsan_thread.h"
#include "lsan.h"
#include "lsan_allocator.h"
#include "lsan_common.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"
namespace __lsan {
static ThreadRegistry *thread_registry;
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);
}
ThreadContextLsanBase::ThreadContextLsanBase(int tid)
: ThreadContextBase(tid) {}
void ThreadContextLsanBase::OnFinished() {
AllocatorThreadFinish();
DTLS_Destroy();
}
u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached, void *arg) {
return thread_registry->CreateThread(user_id, detached, parent_tid, arg);
}
void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
ThreadType thread_type, void *arg) {
thread_registry->StartThread(tid, os_id, thread_type, arg);
SetCurrentThread(tid);
}
void ThreadFinish() {
thread_registry->FinishThread(GetCurrentThread());
SetCurrentThread(kInvalidTid);
}
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 ThreadDetach(u32 tid) {
CHECK_NE(tid, kInvalidTid);
thread_registry->DetachThread(tid, /* arg */ nullptr);
}
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. /////
void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
void *arg) {}
void LockThreadRegistry() { thread_registry->Lock(); }
void UnlockThreadRegistry() { thread_registry->Unlock(); }
ThreadRegistry *GetThreadRegistryLocked() {
thread_registry->CheckLocked();
return thread_registry;
}
} // namespace __lsan