1 files changed, 112 insertions, 0 deletions
diff --git a/compiler-rt/lib/hwasan/hwasan_thread.h b/compiler-rt/lib/hwasan/hwasan_thread.h
new file mode 100644
index 000000000000..42c1e9e124b0
--- /dev/null
+++ b/compiler-rt/lib/hwasan/hwasan_thread.h
@@ -0,0 +1,112 @@
+//===-- hwasan_thread.h -----------------------------------------*- 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 a part of HWAddressSanitizer.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef HWASAN_THREAD_H
+#define HWASAN_THREAD_H
+
+#include "hwasan_allocator.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_ring_buffer.h"
+
+namespace __hwasan {
+
+typedef __sanitizer::CompactRingBuffer<uptr> StackAllocationsRingBuffer;
+
+class Thread {
+ public:
+  void Init(uptr stack_buffer_start, uptr stack_buffer_size);  // Must be called from the thread itself.
+  void InitRandomState();
+  void Destroy();
+
+  uptr stack_top() { return stack_top_; }
+  uptr stack_bottom() { return stack_bottom_; }
+  uptr stack_size() { return stack_top() - stack_bottom(); }
+  uptr tls_begin() { return tls_begin_; }
+  uptr tls_end() { return tls_end_; }
+  bool IsMainThread() { return unique_id_ == 0; }
+
+  bool AddrIsInStack(uptr addr) {
+    return addr >= stack_bottom_ && addr < stack_top_;
+  }
+
+  bool InSignalHandler() { return in_signal_handler_; }
+  void EnterSignalHandler() { in_signal_handler_++; }
+  void LeaveSignalHandler() { in_signal_handler_--; }
+
+  bool InSymbolizer() { return in_symbolizer_; }
+  void EnterSymbolizer() { in_symbolizer_++; }
+  void LeaveSymbolizer() { in_symbolizer_--; }
+
+  AllocatorCache *allocator_cache() { return &allocator_cache_; }
+  HeapAllocationsRingBuffer *heap_allocations() { return heap_allocations_; }
+  StackAllocationsRingBuffer *stack_allocations() { return stack_allocations_; }
+
+  tag_t GenerateRandomTag();
+
+  void DisableTagging() { tagging_disabled_++; }
+  void EnableTagging() { tagging_disabled_--; }
+  bool TaggingIsDisabled() const { return tagging_disabled_; }
+
+  u64 unique_id() const { return unique_id_; }
+  void Announce() {
+    if (announced_) return;
+    announced_ = true;
+    Print("Thread: ");
+  }
+
+  uptr &vfork_spill() { return vfork_spill_; }
+
+ private:
+  // NOTE: There is no Thread constructor. It is allocated
+  // via mmap() and *must* be valid in zero-initialized state.
+  void ClearShadowForThreadStackAndTLS();
+  void Print(const char *prefix);
+  uptr vfork_spill_;
+  uptr stack_top_;
+  uptr stack_bottom_;
+  uptr tls_begin_;
+  uptr tls_end_;
+
+  unsigned in_signal_handler_;
+  unsigned in_symbolizer_;
+
+  u32 random_state_;
+  u32 random_buffer_;
+
+  AllocatorCache allocator_cache_;
+  HeapAllocationsRingBuffer *heap_allocations_;
+  StackAllocationsRingBuffer *stack_allocations_;
+
+  static void InsertIntoThreadList(Thread *t);
+  static void RemoveFromThreadList(Thread *t);
+  Thread *next_;  // All live threads form a linked list.
+
+  u64 unique_id_;  // counting from zero.
+
+  u32 tagging_disabled_;  // if non-zero, malloc uses zero tag in this thread.
+
+  bool announced_;
+
+  friend struct ThreadListHead;
+};
+
+Thread *GetCurrentThread();
+uptr *GetCurrentThreadLongPtr();
+
+struct ScopedTaggingDisabler {
+  ScopedTaggingDisabler() { GetCurrentThread()->DisableTagging(); }
+  ~ScopedTaggingDisabler() { GetCurrentThread()->EnableTagging(); }
+};
+
+} // namespace __hwasan
+
+#endif // HWASAN_THREAD_H