Avoid redundant allocation of accessor names.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 5384 matching lines @@
   static intptr_t HashLatin1(const uint8_t* characters, intptr_t len);
   static intptr_t Hash(const uint16_t* characters, intptr_t len);
   static intptr_t Hash(const int32_t* characters, intptr_t len);
   static intptr_t HashRawSymbol(const RawString* symbol) {
     ASSERT(symbol->IsCanonical());
     intptr_t result = Smi::Value(symbol->ptr()->hash_);
     ASSERT(result != 0);
     return result;
   }
 
+  // Returns the hash of str1 + str2.
+  static intptr_t HashConcat(const String& str1, const String& str2);
+
   virtual RawObject* HashCode() const { return Integer::New(Hash()); }
 
   int32_t CharAt(intptr_t index) const;
 
   Scanner::CharAtFunc CharAtFunc() const;
 
   intptr_t CharSize() const;
 
   inline bool Equals(const String& str) const;
   inline bool Equals(const String& str,
                      intptr_t begin_index,  // begin index on 'str'.
                      intptr_t len) const;  // len on 'str'.
 
   // Compares to a '\0' terminated array of UTF-8 encoded characters.
   bool Equals(const char* cstr) const;
 
   // Compares to an array of Latin-1 encoded characters.
   bool EqualsLatin1(const uint8_t* characters, intptr_t len) const {
     return Equals(characters, len);
   }
 
   // Compares to an array of UTF-16 encoded characters.
   bool Equals(const uint16_t* characters, intptr_t len) const;
 
   // Compares to an array of UTF-32 encoded characters.
   bool Equals(const int32_t* characters, intptr_t len) const;
 
+  // True iff this string equals str1 + str2.
+  bool EqualsConcat(const String& str1, const String& str2) const;
+
   virtual bool OperatorEquals(const Instance& other) const {
     return Equals(other);
   }
   virtual bool CanonicalizeEquals(const Instance& other) const {
     return Equals(other);
   }
   virtual bool Equals(const Instance& other) const;
 
   intptr_t CompareTo(const String& other) const;
 
@@ skipping 178 matching lines @@
 
   intptr_t EscapedString(char* buffer, int max_len) const;
   intptr_t EscapedStringLen(intptr_t tooLong) const;
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(String, Instance);
 
   friend class Class;
   friend class Symbols;
   friend class StringSlice;  // SetHash
   template<typename CharType> friend class CharArray;  // SetHash
+  friend class ConcatString;  // SetHash
   friend class OneByteString;
   friend class TwoByteString;
   friend class ExternalOneByteString;
   friend class ExternalTwoByteString;
   // So that the MarkingVisitor can print a debug string from a NoHandleScope.
   friend class MarkingVisitor;
 };
 
 
 class OneByteString : public AllStatic {
@@ skipping 114 matching lines @@
 
   static RawOneByteString* ReadFrom(SnapshotReader* reader,
                                     intptr_t object_id,
                                     intptr_t tags,
                                     Snapshot::Kind kind);
 
   friend class Class;
   friend class String;
   friend class ExternalOneByteString;
   friend class SnapshotReader;
+  friend class StringHasher;
 };
 
 
 class TwoByteString : public AllStatic {
  public:
   static int32_t CharAt(const String& str, intptr_t index) {
     return *CharAddr(str, index);
   }
 
   static void SetCharAt(const String& str, intptr_t index, uint16_t ch) {
@@ skipping 1531 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_