Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/arenastring.h

Index: third_party/protobuf/src/google/protobuf/arenastring.h
diff --git a/third_party/protobuf/src/google/protobuf/arenastring.h b/third_party/protobuf/src/google/protobuf/arenastring.h
deleted file mode 100644
index d829ed9191dcb18c74b400d346dcd366769d1bcf..0000000000000000000000000000000000000000
--- a/third_party/protobuf/src/google/protobuf/arenastring.h
+++ /dev/null
@@ -1,315 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef GOOGLE_PROTOBUF_ARENASTRING_H__
-#define GOOGLE_PROTOBUF_ARENASTRING_H__
-
-#include <string>
-
-#include <google/protobuf/stubs/common.h>
-#include <google/protobuf/stubs/fastmem.h>
-
-#include <google/protobuf/arena.h>
-#include <google/protobuf/generated_message_util.h>
-
-
-
-// This is the implementation of arena string fields written for the open-source
-// release. The ArenaStringPtr struct below is an internal implementation class
-// and *should not be used* by user code. It is used to collect string
-// operations together into one place and abstract away the underlying
-// string-field pointer representation, so that (for example) an alternate
-// implementation that knew more about ::std::string's internals could integrate more
-// closely with the arena allocator.
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-struct LIBPROTOBUF_EXPORT ArenaStringPtr {
-  inline void Set(const ::std::string* default_value,
-                  const ::std::string& value, ::google::protobuf::Arena* arena) {
-    if (ptr_ == default_value) {
-      CreateInstance(arena, &value);
-    } else {
-      *ptr_ = value;
-    }
-  }
-
-  // Basic accessors.
-  inline const ::std::string& Get(const ::std::string* default_value) const {
-    return *ptr_;
-  }
-
-  inline ::std::string* Mutable(const ::std::string* default_value,
-                           ::google::protobuf::Arena* arena) {
-    if (ptr_ == default_value) {
-      CreateInstance(arena, default_value);
-    }
-    return ptr_;
-  }
-
-  // Release returns a ::std::string* instance that is heap-allocated and is not
-  // Own()'d by any arena. If the field was not set, it returns NULL. The caller
-  // retains ownership. Clears this field back to NULL state. Used to implement
-  // release_<field>() methods on generated classes.
-  inline ::std::string* Release(const ::std::string* default_value,
-                           ::google::protobuf::Arena* arena) {
-    if (ptr_ == default_value) {
-      return NULL;
-    }
-    ::std::string* released = NULL;
-    if (arena != NULL) {
-      // ptr_ is owned by the arena -- we need to return a copy.
-      released = new ::std::string(*ptr_);
-    } else {
-      released = ptr_;
-    }
-    ptr_ = const_cast< ::std::string* >(default_value);
-    return released;
-  }
-
-  // UnsafeArenaRelease returns a ::std::string*, but it may be arena-owned (i.e.
-  // have its destructor already registered) if arena != NULL. If the field was
-  // not set, this returns NULL. This method clears this field back to NULL
-  // state. Used to implement unsafe_arena_release_<field>() methods on
-  // generated classes.
-  inline ::std::string* UnsafeArenaRelease(const ::std::string* default_value,
-                                      ::google::protobuf::Arena* arena) {
-    if (ptr_ == default_value) {
-      return NULL;
-    }
-    ::std::string* released = ptr_;
-    ptr_ = const_cast< ::std::string* >(default_value);
-    return released;
-  }
-
-  // Takes a string that is heap-allocated, and takes ownership. The string's
-  // destructor is registered with the arena. Used to implement
-  // set_allocated_<field> in generated classes.
-  inline void SetAllocated(const ::std::string* default_value,
-                           ::std::string* value, ::google::protobuf::Arena* arena) {
-    if (arena == NULL && ptr_ != default_value) {
-      Destroy(default_value, arena);
-    }
-    if (value != NULL) {
-      ptr_ = value;
-      if (arena != NULL) {
-        arena->Own(value);
-      }
-    } else {
-      ptr_ = const_cast< ::std::string* >(default_value);
-    }
-  }
-
-  // Takes a string that has lifetime equal to the arena's lifetime. The arena
-  // must be non-null. It is safe only to pass this method a value returned by
-  // UnsafeArenaRelease() on another field of a message in the same arena. Used
-  // to implement unsafe_arena_set_allocated_<field> in generated classes.
-  inline void UnsafeArenaSetAllocated(const ::std::string* default_value,
-                                      ::std::string* value, ::google::protobuf::Arena* arena) {
-    if (value != NULL) {
-      ptr_ = value;
-    } else {
-      ptr_ = const_cast< ::std::string* >(default_value);
-    }
-  }
-
-  // Swaps internal pointers. Arena-safety semantics: this is guarded by the
-  // logic in Swap()/UnsafeArenaSwap() at the message level, so this method is
-  // 'unsafe' if called directly.
-  inline void Swap(ArenaStringPtr* other) GOOGLE_ATTRIBUTE_ALWAYS_INLINE {
-    std::swap(ptr_, other->ptr_);
-  }
-
-  // Frees storage (if not on an arena) and sets field to default value.
-  inline void Destroy(const ::std::string* default_value,
-                      ::google::protobuf::Arena* arena) {
-    if (arena == NULL && ptr_ != default_value) {
-      delete ptr_;
-    }
-    ptr_ = const_cast< ::std::string* >(default_value);
-  }
-
-  // Clears content, but keeps allocated string if arena != NULL, to avoid the
-  // overhead of heap operations. After this returns, the content (as seen by
-  // the user) will always be the empty string. Assumes that |default_value|
-  // is an empty string.
-  inline void ClearToEmpty(const ::std::string* default_value,
-                           ::google::protobuf::Arena* arena) {
-    if (ptr_ == default_value) {
-      // Already set to default (which is empty) -- do nothing.
-    } else {
-      ptr_->clear();
-    }
-  }
-
-  // Clears content, but keeps allocated string if arena != NULL, to avoid the
-  // overhead of heap operations. After this returns, the content (as seen by
-  // the user) will always be equal to |default_value|.
-  inline void ClearToDefault(const ::std::string* default_value,
-                             ::google::protobuf::Arena* arena) {
-    if (ptr_ == default_value) {
-      // Already set to default -- do nothing.
-    } else {
-      // Have another allocated string -- rather than throwing this away and
-      // resetting ptr_ to the canonical default string instance, we just reuse
-      // this instance.
-      *ptr_ = *default_value;
-    }
-  }
-
-  // Called from generated code / reflection runtime only. Resets value to point
-  // to a default string pointer, with the semantics that this ArenaStringPtr
-  // does not own the pointed-to memory. Disregards initial value of ptr_ (so
-  // this is the *ONLY* safe method to call after construction or when
-  // reinitializing after becoming the active field in a oneof union).
-  inline void UnsafeSetDefault(const ::std::string* default_value) {
-    // Casting away 'const' is safe here: accessors ensure that ptr_ is only
-    // returned as a const if it is equal to default_value.
-    ptr_ = const_cast< ::std::string* >(default_value);
-  }
-
-  // The 'NoArena' variants of methods below assume arena == NULL and are
-  // optimized to provide very little overhead relative to a raw string pointer
-  // (while still being in-memory compatible with other code that assumes
-  // ArenaStringPtr). Note the invariant that a class instance that has only
-  // ever been mutated by NoArena methods must *only* be in the String state
-  // (i.e., tag bits are not used), *NEVER* ArenaString. This allows all
-  // tagged-pointer manipulations to be avoided.
-  inline void SetNoArena(const ::std::string* default_value,
-                         const ::std::string& value) {
-    if (ptr_ == default_value) {
-      CreateInstanceNoArena(&value);
-    } else {
-      *ptr_ = value;
-    }
-  }
-
-  void AssignWithDefault(const ::std::string* default_value, ArenaStringPtr value);
-
-  inline const ::std::string& GetNoArena(const ::std::string* default_value) const {
-    return *ptr_;
-  }
-
-  inline ::std::string* MutableNoArena(const ::std::string* default_value) {
-    if (ptr_ == default_value) {
-      CreateInstanceNoArena(default_value);
-    }
-    return ptr_;
-  }
-
-  inline ::std::string* ReleaseNoArena(const ::std::string* default_value) {
-    if (ptr_ == default_value) {
-      return NULL;
-    } else {
-      ::std::string* released = ptr_;
-      ptr_ = const_cast< ::std::string* >(default_value);
-      return released;
-    }
-  }
-
-  inline void SetAllocatedNoArena(const ::std::string* default_value,
-                                  ::std::string* value) {
-    if (ptr_ != default_value) {
-      delete ptr_;
-    }
-    if (value != NULL) {
-      ptr_ = value;
-    } else {
-      ptr_ = const_cast< ::std::string* >(default_value);
-    }
-  }
-
-  inline void DestroyNoArena(const ::std::string* default_value) {
-    if (ptr_ != default_value) {
-      delete ptr_;
-    }
-    ptr_ = NULL;
-  }
-
-  inline void ClearToEmptyNoArena(const ::std::string* default_value) {
-    if (ptr_ == default_value) {
-      // Nothing: already equal to default (which is the empty string).
-    } else {
-      ptr_->clear();
-    }
-  }
-
-  inline void ClearToDefaultNoArena(const ::std::string* default_value) {
-    if (ptr_ == default_value) {
-      // Nothing: already set to default.
-    } else {
-      // Reuse existing allocated instance.
-      *ptr_ = *default_value;
-    }
-  }
-
-  // Internal accessor used only at parse time to provide direct access to the
-  // raw pointer from the shared parse routine (in the non-arenas case). The
-  // parse routine does the string allocation in order to save code size in the
-  // generated parsing code.
-  inline ::std::string** UnsafeRawStringPointer() {
-    return &ptr_;
-  }
-
- private:
-  ::std::string* ptr_;
-
-  inline void CreateInstance(::google::protobuf::Arena* arena,
-                             const ::std::string* initial_value)
-      GOOGLE_ATTRIBUTE_NOINLINE {
-    // Assumes ptr_ is not NULL.
-    if (initial_value != NULL) {
-      ptr_ = new ::std::string(*initial_value);
-    } else {
-      ptr_ = new ::std::string();
-    }
-    if (arena != NULL) {
-      arena->Own(ptr_);
-    }
-  }
-  inline void CreateInstanceNoArena(const ::std::string* initial_value)
-      GOOGLE_ATTRIBUTE_NOINLINE {
-    if (initial_value != NULL) {
-      ptr_ = new ::std::string(*initial_value);
-    } else {
-      ptr_ = new ::std::string();
-    }
-  }
-};
-
-}  // namespace internal
-}  // namespace protobuf
-
-
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_ARENASTRING_H__