[msan] Introduce MsanThread. Move thread-local allocator cache out of TLS.

This reduces .tbss from 109K down to almost nothing.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@205618 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/msan/msan_thread.h b/lib/msan/msan_thread.h
new file mode 100644
index 000000000..82ed96c0a
--- /dev/null
+++ b/lib/msan/msan_thread.h
@@ -0,0 +1,65 @@
+//===-- msan_thread.h -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MSAN_THREAD_H
+#define MSAN_THREAD_H
+
+#include "msan_allocator.h"
+#include "sanitizer_common/sanitizer_common.h"
+
+namespace __msan {
+
+class MsanThread {
+ public:
+  static MsanThread *Create(thread_callback_t start_routine, void *arg);
+  static void TSDDtor(void *tsd);
+  void Destroy();
+
+  void Init();  // Should be called from the thread itself.
+  thread_return_t ThreadStart();
+
+  uptr stack_top() { return stack_top_; }
+  uptr stack_bottom() { return stack_bottom_; }
+  uptr tls_begin() { return tls_begin_; }
+  uptr tls_end() { return tls_end_; }
+  bool IsMainThread() { return start_routine_ == 0; }
+
+  bool AddrIsInStack(uptr addr) {
+    return addr >= stack_bottom_ && addr < stack_top_;
+  }
+
+  MsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
+
+  int destructor_iterations_;
+
+ private:
+  // NOTE: There is no MsanThread constructor. It is allocated
+  // via mmap() and *must* be valid in zero-initialized state.
+  void SetThreadStackAndTls();
+  void ClearShadowForThreadStackAndTLS();
+  thread_callback_t start_routine_;
+  void *arg_;
+  uptr stack_top_;
+  uptr stack_bottom_;
+  uptr tls_begin_;
+  uptr tls_end_;
+
+  MsanThreadLocalMallocStorage malloc_storage_;
+};
+
+MsanThread *GetCurrentThread();
+void SetCurrentThread(MsanThread *t);
+
+} // namespace __msan
+
+#endif // MSAN_THREAD_H