contrib/llvm-project/compiler-rt/lib/scudo/scudo_tsd_shared.inc

   1 //===-- scudo_tsd_shared.inc ------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 ///
   9 /// Scudo shared TSD fastpath functions implementation.
  10 ///
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef SCUDO_TSD_H_
  14 # error "This file must be included inside scudo_tsd.h."
  15 #endif  // SCUDO_TSD_H_
  16
  17 #if !SCUDO_TSD_EXCLUSIVE
  18
  19 extern pthread_key_t PThreadKey;
  20
  21 #if SANITIZER_LINUX && !SANITIZER_ANDROID
  22 __attribute__((tls_model("initial-exec")))
  23 extern THREADLOCAL ScudoTSD *CurrentTSD;
  24 #endif
  25
  26 ALWAYS_INLINE ScudoTSD* getCurrentTSD() {
  27 #if SANITIZER_ANDROID
  28   return reinterpret_cast<ScudoTSD *>(*get_android_tls_ptr());
  29 #elif SANITIZER_LINUX
  30   return CurrentTSD;
  31 #else
  32   return reinterpret_cast<ScudoTSD *>(pthread_getspecific(PThreadKey));
  33 #endif  // SANITIZER_ANDROID
  34 }
  35
  36 ALWAYS_INLINE void initThreadMaybe(bool MinimalInit = false) {
  37   if (LIKELY(getCurrentTSD()))
  38     return;
  39   initThread(MinimalInit);
  40 }
  41
  42 ScudoTSD *getTSDAndLockSlow(ScudoTSD *TSD);
  43
  44 ALWAYS_INLINE ScudoTSD *getTSDAndLock(bool *UnlockRequired) {
  45   ScudoTSD *TSD = getCurrentTSD();
  46   DCHECK(TSD && "No TSD associated with the current thread!");
  47   *UnlockRequired = true;
  48   // Try to lock the currently associated context.
  49   if (TSD->tryLock())
  50     return TSD;
  51   // If it failed, go the slow path.
  52   return getTSDAndLockSlow(TSD);
  53 }
  54
  55 #endif  // !SCUDO_TSD_EXCLUSIVE