1 files changed, 0 insertions, 139 deletions
diff --git a/llvm/include/llvm/Support/StringPool.h b/llvm/include/llvm/Support/StringPool.h
deleted file mode 100644
index a4f45916f53d..000000000000
--- a/llvm/include/llvm/Support/StringPool.h
+++ /dev/null
@@ -1,139 +0,0 @@
-//===- StringPool.h - Interned string pool ----------------------*- 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 declares an interned string pool, which helps reduce the cost of
-// strings by using the same storage for identical strings.
-//
-// To intern a string:
-//
-//   StringPool Pool;
-//   PooledStringPtr Str = Pool.intern("wakka wakka");
-//
-// To use the value of an interned string, use operator bool and operator*:
-//
-//   if (Str)
-//     cerr << "the string is" << *Str << "\n";
-//
-// Pooled strings are immutable, but you can change a PooledStringPtr to point
-// to another instance. So that interned strings can eventually be freed,
-// strings in the string pool are reference-counted (automatically).
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SUPPORT_STRINGPOOL_H
-#define LLVM_SUPPORT_STRINGPOOL_H
-
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
-#include <cassert>
-
-namespace llvm {
-
-  class PooledStringPtr;
-
-  /// StringPool - An interned string pool. Use the intern method to add a
-  /// string. Strings are removed automatically as PooledStringPtrs are
-  /// destroyed.
-  class StringPool {
-    /// PooledString - This is the value of an entry in the pool's interning
-    /// table.
-    struct PooledString {
-      StringPool *Pool = nullptr;  ///< So the string can remove itself.
-      unsigned Refcount = 0;       ///< Number of referencing PooledStringPtrs.
-
-    public:
-      PooledString() = default;
-    };
-
-    friend class PooledStringPtr;
-
-    using table_t = StringMap<PooledString>;
-    using entry_t = StringMapEntry<PooledString>;
-    table_t InternTable;
-
-  public:
-    StringPool();
-    ~StringPool();
-
-    /// intern - Adds a string to the pool and returns a reference-counted
-    /// pointer to it. No additional memory is allocated if the string already
-    /// exists in the pool.
-    PooledStringPtr intern(StringRef Str);
-
-    /// empty - Checks whether the pool is empty. Returns true if so.
-    ///
-    inline bool empty() const { return InternTable.empty(); }
-  };
-
-  /// PooledStringPtr - A pointer to an interned string. Use operator bool to
-  /// test whether the pointer is valid, and operator * to get the string if so.
-  /// This is a lightweight value class with storage requirements equivalent to
-  /// a single pointer, but it does have reference-counting overhead when
-  /// copied.
-  class PooledStringPtr {
-    using entry_t = StringPool::entry_t;
-
-    entry_t *S = nullptr;
-
-  public:
-    PooledStringPtr() = default;
-
-    explicit PooledStringPtr(entry_t *E) : S(E) {
-      if (S) ++S->getValue().Refcount;
-    }
-
-    PooledStringPtr(const PooledStringPtr &That) : S(That.S) {
-      if (S) ++S->getValue().Refcount;
-    }
-
-    PooledStringPtr &operator=(const PooledStringPtr &That) {
-      if (S != That.S) {
-        clear();
-        S = That.S;
-        if (S) ++S->getValue().Refcount;
-      }
-      return *this;
-    }
-
-    void clear() {
-      if (!S)
-        return;
-      if (--S->getValue().Refcount == 0) {
-        S->getValue().Pool->InternTable.remove(S);
-        S->Destroy();
-      }
-      S = nullptr;
-    }
-
-    ~PooledStringPtr() { clear(); }
-
-    inline const char *begin() const {
-      assert(*this && "Attempt to dereference empty PooledStringPtr!");
-      return S->getKeyData();
-    }
-
-    inline const char *end() const {
-      assert(*this && "Attempt to dereference empty PooledStringPtr!");
-      return S->getKeyData() + S->getKeyLength();
-    }
-
-    inline unsigned size() const {
-      assert(*this && "Attempt to dereference empty PooledStringPtr!");
-      return S->getKeyLength();
-    }
-
-    inline const char *operator*() const { return begin(); }
-    inline explicit operator bool() const { return S != nullptr; }
-
-    inline bool operator==(const PooledStringPtr &That) const { return S == That.S; }
-    inline bool operator!=(const PooledStringPtr &That) const { return S != That.S; }
-  };
-
-} // end namespace llvm
-
-#endif // LLVM_SUPPORT_STRINGPOOL_H