Merge pull request #23529 from alexrp/2879-groundwork

Introduce libzigc for libc function implementations in Zig

1 files changed, 109 insertions, 0 deletions

diff --git a/lib/libtsan/sanitizer_common/sanitizer_thread_arg_retval.cpp b/lib/libtsan/sanitizer_common/sanitizer_thread_arg_retval.cpp
new file mode 100644
index 0000000000..754fd7b65a
--- /dev/null
+++ b/lib/libtsan/sanitizer_common/sanitizer_thread_arg_retval.cpp
@@ -0,0 +1,109 @@
+//===-- sanitizer_thread_arg_retval.cpp -------------------------*- C++ -*-===//
+//
+// 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 shared between sanitizer tools.
+//
+// Tracks thread arguments and return value for leak checking.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_thread_arg_retval.h"
+
+#include "sanitizer_placement_new.h"
+
+namespace __sanitizer {
+
+void ThreadArgRetval::CreateLocked(uptr thread, bool detached,
+                                   const Args& args) {
+  CheckLocked();
+  Data& t = data_[thread];
+  t = {};
+  t.gen = gen_++;
+  static_assert(sizeof(gen_) == sizeof(u32) && kInvalidGen == UINT32_MAX);
+  if (gen_ == kInvalidGen)
+    gen_ = 0;
+  t.detached = detached;
+  t.args = args;
+}
+
+ThreadArgRetval::Args ThreadArgRetval::GetArgs(uptr thread) const {
+  __sanitizer::Lock lock(&mtx_);
+  auto t = data_.find(thread);
+  CHECK(t);
+  if (t->second.done)
+    return {};
+  return t->second.args;
+}
+
+void ThreadArgRetval::Finish(uptr thread, void* retval) {
+  __sanitizer::Lock lock(&mtx_);
+  auto t = data_.find(thread);
+  if (!t)
+    return;
+  if (t->second.detached) {
+    // Retval of detached thread connot be retrieved.
+    data_.erase(t);
+    return;
+  }
+  t->second.done = true;
+  t->second.args.arg_retval = retval;
+}
+
+u32 ThreadArgRetval::BeforeJoin(uptr thread) const {
+  __sanitizer::Lock lock(&mtx_);
+  auto t = data_.find(thread);
+  if (t && !t->second.detached) {
+    return t->second.gen;
+  }
+  if (!common_flags()->detect_invalid_join)
+    return kInvalidGen;
+  const char* reason = "unknown";
+  if (!t) {
+    reason = "already joined";
+  } else if (t->second.detached) {
+    reason = "detached";
+  }
+  Report("ERROR: %s: Joining %s thread, aborting.\n", SanitizerToolName,
+         reason);
+  Die();
+}
+
+void ThreadArgRetval::AfterJoin(uptr thread, u32 gen) {
+  __sanitizer::Lock lock(&mtx_);
+  auto t = data_.find(thread);
+  if (!t || gen != t->second.gen) {
+    // Thread was reused and erased by any other event, or we had an invalid
+    // join.
+    return;
+  }
+  CHECK(!t->second.detached);
+  data_.erase(t);
+}
+
+void ThreadArgRetval::DetachLocked(uptr thread) {
+  CheckLocked();
+  auto t = data_.find(thread);
+  CHECK(t);
+  CHECK(!t->second.detached);
+  if (t->second.done) {
+    // We can't retrive retval after detached thread finished.
+    data_.erase(t);
+    return;
+  }
+  t->second.detached = true;
+}
+
+void ThreadArgRetval::GetAllPtrsLocked(InternalMmapVector<uptr>* ptrs) {
+  CheckLocked();
+  CHECK(ptrs);
+  data_.forEach([&](DenseMap<uptr, Data>::value_type& kv) -> bool {
+    ptrs->push_back((uptr)kv.second.args.arg_retval);
+    return true;
+  });
+}
+
+}  // namespace __sanitizer