libsanitizer/sanitizer_common/sanitizer_thread_arg_retval.cpp

   1 //===-- sanitizer_thread_arg_retval.cpp -------------------------*- 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 // This file is shared between sanitizer tools.
  10 //
  11 // Tracks thread arguments and return value for leak checking.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_thread_arg_retval.h"
  15
  16 #include "sanitizer_placement_new.h"
  17
  18 namespace __sanitizer {
  19
  20 void ThreadArgRetval::CreateLocked(uptr thread, bool detached,
  21                                    const Args& args) {
  22   CheckLocked();
  23   Data& t = data_[thread];
  24   t = {};
  25   t.gen = gen_++;
  26   t.detached = detached;
  27   t.args = args;
  28 }
  29
  30 ThreadArgRetval::Args ThreadArgRetval::GetArgs(uptr thread) const {
  31   __sanitizer::Lock lock(&mtx_);
  32   auto t = data_.find(thread);
  33   CHECK(t);
  34   if (t->second.done)
  35     return {};
  36   return t->second.args;
  37 }
  38
  39 void ThreadArgRetval::Finish(uptr thread, void* retval) {
  40   __sanitizer::Lock lock(&mtx_);
  41   auto t = data_.find(thread);
  42   if (!t)
  43     return;
  44   if (t->second.detached) {
  45     // Retval of detached thread connot be retrieved.
  46     data_.erase(t);
  47     return;
  48   }
  49   t->second.done = true;
  50   t->second.args.arg_retval = retval;
  51 }
  52
  53 u32 ThreadArgRetval::BeforeJoin(uptr thread) const {
  54   __sanitizer::Lock lock(&mtx_);
  55   auto t = data_.find(thread);
  56   CHECK(t);
  57   CHECK(!t->second.detached);
  58   return t->second.gen;
  59 }
  60
  61 void ThreadArgRetval::AfterJoin(uptr thread, u32 gen) {
  62   __sanitizer::Lock lock(&mtx_);
  63   auto t = data_.find(thread);
  64   if (!t || gen != t->second.gen) {
  65     // Thread was reused and erased by any other event.
  66     return;
  67   }
  68   CHECK(!t->second.detached);
  69   data_.erase(t);
  70 }
  71
  72 void ThreadArgRetval::DetachLocked(uptr thread) {
  73   CheckLocked();
  74   auto t = data_.find(thread);
  75   CHECK(t);
  76   CHECK(!t->second.detached);
  77   if (t->second.done) {
  78     // We can't retrive retval after detached thread finished.
  79     data_.erase(t);
  80     return;
  81   }
  82   t->second.detached = true;
  83 }
  84
  85 void ThreadArgRetval::GetAllPtrsLocked(InternalMmapVector<uptr>* ptrs) {
  86   CheckLocked();
  87   CHECK(ptrs);
  88   data_.forEach([&](DenseMap<uptr, Data>::value_type& kv) -> bool {
  89     ptrs->push_back((uptr)kv.second.args.arg_retval);
  90     return true;
  91   });
  92 }
  93
  94 }  // namespace __sanitizer