Revert "[hwasan] Record and display stack history in stack-based reports."

This reverts commit r342921: test failures on clang-cmake-arm* bots.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@342922 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 80 deletions

diff --git a/lib/sanitizer_common/sanitizer_ring_buffer.h b/lib/sanitizer_common/sanitizer_ring_buffer.h
index d15f27fd4..c4649c2be 100644
--- a/lib/sanitizer_common/sanitizer_ring_buffer.h
+++ b/lib/sanitizer_common/sanitizer_ring_buffer.h
@@ -72,91 +72,12 @@ class RingBuffer {
   // L: last_, always points to the last data element.
   // N: next_, initially equals to last_, is decremented on every push,
   //    wraps around if it's less or equal than its own address.
+
   T *last_;
   T *next_;
   T data_[1];  // flexible array.
 };
 
-// A ring buffer with externally provided storage that encodes its state in 8
-// bytes. Has significant constraints on size and alignment of storage.
-// See a comment in hwasan/hwasan_thread_list.h for the motivation behind this.
-#if SANITIZER_WORDSIZE == 64
-template <class T>
-class CompactRingBuffer {
-  // Top byte of long_ stores the buffer size in pages.
-  // Lower bytes store the address of the next buffer element.
-  static constexpr int kPageSizeBits = 12;
-  static constexpr int kSizeShift = 56;
-  static constexpr uptr kNextMask = (1ULL << kSizeShift) - 1;
-
-  uptr GetStorageSize() const { return (long_ >> kSizeShift) << kPageSizeBits; }
-
-  void Init(void *storage, uptr size) {
-    CHECK_EQ(sizeof(CompactRingBuffer<T>), sizeof(void *));
-    CHECK(IsPowerOfTwo(size));
-    CHECK_GE(size, 1 << kPageSizeBits);
-    CHECK_LE(size, 128 << kPageSizeBits);
-    CHECK_EQ(size % 4096, 0);
-    CHECK_EQ(size % sizeof(T), 0);
-    CHECK_EQ((uptr)storage % (size * 2), 0);
-    long_ = (uptr)storage | ((size >> kPageSizeBits) << kSizeShift);
-  }
-
-  void SetNext(const T *next) {
-    long_ = (long_ & ~kNextMask) | (uptr)next;
-  }
-
- public:
-  CompactRingBuffer(void *storage, uptr size) {
-    Init(storage, size);
-  }
-
-  // A copy constructor of sorts.
-  CompactRingBuffer(const CompactRingBuffer &other, void *storage) {
-    uptr size = other.GetStorageSize();
-    internal_memcpy(storage, other.StartOfStorage(), size);
-    Init(storage, size);
-    uptr Idx = other.Next() - (const T *)other.StartOfStorage();
-    SetNext((const T *)storage + Idx);
-  }
-
-  T *Next() const { return (T *)(long_ & kNextMask); }
-
-  void *StartOfStorage() const {
-    return (void *)((uptr)Next() & ~(GetStorageSize() - 1));
-  }
-
-  void *EndOfStorage() const {
-    return (void *)((uptr)StartOfStorage() + GetStorageSize());
-  }
-
-  uptr size() const { return GetStorageSize() / sizeof(T); }
-
-  void push(T t) {
-    T *next = Next();
-    *next = t;
-    next++;
-    next = (T *)((uptr)next & ~GetStorageSize());
-    SetNext(next);
-  }
-
-  T operator[](uptr Idx) const {
-    CHECK_LT(Idx, size());
-    const T *Begin = (const T *)StartOfStorage();
-    sptr StorageIdx = Next() - Begin;
-    StorageIdx -= (sptr)(Idx + 1);
-    if (StorageIdx < 0)
-      StorageIdx += size();
-    return Begin[StorageIdx];
-  }
-
- public:
-  ~CompactRingBuffer() {}
-  CompactRingBuffer(const CompactRingBuffer &) = delete;
-
-  uptr long_;
-};
-#endif
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_RING_BUFFER_H