llvm-project

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//=-- lsan_thread.cpp -----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of LeakSanitizer.
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// See lsan_thread.h for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lsan_thread.h"
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#include "lsan.h"
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#include "lsan_allocator.h"
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#include "lsan_common.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_thread_registry.h"
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#include "sanitizer_common/sanitizer_tls_get_addr.h"
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namespace __lsan {
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static ThreadRegistry *thread_registry;
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static ThreadArgRetval *thread_arg_retval;
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static Mutex mu_for_thread_context;
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static LowLevelAllocator allocator_for_thread_context;
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static ThreadContextBase *CreateThreadContext(u32 tid) {
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  Lock lock(&mu_for_thread_context);
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  return new (allocator_for_thread_context) ThreadContext(tid);
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}
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void InitializeThreads() {
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  static ALIGNED(alignof(
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      ThreadRegistry)) char thread_registry_placeholder[sizeof(ThreadRegistry)];
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  thread_registry =
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      new (thread_registry_placeholder) ThreadRegistry(CreateThreadContext);
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  static ALIGNED(alignof(ThreadArgRetval)) char
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      thread_arg_retval_placeholder[sizeof(ThreadArgRetval)];
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  thread_arg_retval = new (thread_arg_retval_placeholder) ThreadArgRetval();
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}
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ThreadArgRetval &GetThreadArgRetval() { return *thread_arg_retval; }
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ThreadContextLsanBase::ThreadContextLsanBase(int tid)
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    : ThreadContextBase(tid) {}
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void ThreadContextLsanBase::OnStarted(void *arg) {
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  SetCurrentThread(this);
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  AllocatorThreadStart();
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}
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void ThreadContextLsanBase::OnFinished() {
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  AllocatorThreadFinish();
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  DTLS_Destroy();
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  SetCurrentThread(nullptr);
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}
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u32 ThreadCreate(u32 parent_tid, bool detached, void *arg) {
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  return thread_registry->CreateThread(0, detached, parent_tid, arg);
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}
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void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
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                                        ThreadType thread_type, void *arg) {
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  thread_registry->StartThread(tid, os_id, thread_type, arg);
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}
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void ThreadFinish() { thread_registry->FinishThread(GetCurrentThreadId()); }
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void EnsureMainThreadIDIsCorrect() {
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  if (GetCurrentThreadId() == kMainTid)
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    GetCurrentThread()->os_id = GetTid();
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}
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///// Interface to the common LSan module. /////
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void GetThreadExtraStackRangesLocked(tid_t os_id,
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                                     InternalMmapVector<Range> *ranges) {}
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void GetThreadExtraStackRangesLocked(InternalMmapVector<Range> *ranges) {}
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void LockThreads() {
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  thread_registry->Lock();
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  thread_arg_retval->Lock();
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}
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void UnlockThreads() {
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  thread_arg_retval->Unlock();
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  thread_registry->Unlock();
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}
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ThreadRegistry *GetLsanThreadRegistryLocked() {
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  thread_registry->CheckLocked();
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  return thread_registry;
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}
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void GetRunningThreadsLocked(InternalMmapVector<tid_t> *threads) {
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  GetLsanThreadRegistryLocked()->RunCallbackForEachThreadLocked(
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      [](ThreadContextBase *tctx, void *threads) {
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        if (tctx->status == ThreadStatusRunning) {
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          reinterpret_cast<InternalMmapVector<tid_t> *>(threads)->push_back(
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              tctx->os_id);
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        }
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      },
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      threads);
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}
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void GetAdditionalThreadContextPtrsLocked(InternalMmapVector<uptr> *ptrs) {
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  GetThreadArgRetval().GetAllPtrsLocked(ptrs);
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}
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}  // namespace __lsan
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