vendor/compiler-rt/compiler-rt-trunk-r301939

1 files changed, 62 insertions, 0 deletions

diff --git a/lib/scudo/scudo_tls_linux.cpp b/lib/scudo/scudo_tls_linux.cpp
new file mode 100644
index 000000000000..3453367f8a53
--- /dev/null
+++ b/lib/scudo/scudo_tls_linux.cpp
@@ -0,0 +1,62 @@
+//===-- scudo_tls_linux.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// Scudo thread local structure implementation for platforms supporting
+/// thread_local.
+///
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_platform.h"
+
+#if SANITIZER_LINUX
+
+#include "scudo_tls.h"
+
+#include <limits.h>
+#include <pthread.h>
+
+namespace __scudo {
+
+static pthread_once_t GlobalInitialized = PTHREAD_ONCE_INIT;
+static pthread_key_t PThreadKey;
+
+thread_local ThreadState ScudoThreadState = ThreadNotInitialized;
+thread_local ScudoThreadContext ThreadLocalContext;
+
+static void teardownThread(void *Ptr) {
+  uptr Iteration = reinterpret_cast<uptr>(Ptr);
+  // The glibc POSIX thread-local-storage deallocation routine calls user
+  // provided destructors in a loop of PTHREAD_DESTRUCTOR_ITERATIONS.
+  // We want to be called last since other destructors might call free and the
+  // like, so we wait until PTHREAD_DESTRUCTOR_ITERATIONS before draining the
+  // quarantine and swallowing the cache.
+  if (Iteration < PTHREAD_DESTRUCTOR_ITERATIONS) {
+    pthread_setspecific(PThreadKey, reinterpret_cast<void *>(Iteration + 1));
+    return;
+  }
+  ThreadLocalContext.commitBack();
+  ScudoThreadState = ThreadTornDown;
+}
+
+
+static void initOnce() {
+  CHECK_EQ(pthread_key_create(&PThreadKey, teardownThread), 0);
+  initScudo();
+}
+
+void initThread() {
+  pthread_once(&GlobalInitialized, initOnce);
+  pthread_setspecific(PThreadKey, reinterpret_cast<void *>(1));
+  ThreadLocalContext.init();
+  ScudoThreadState = ThreadInitialized;
+}
+
+}  // namespace __scudo
+
+#endif  // SANITIZER_LINUX