Custom call IC-s for String.prototype.{charAt,charCodeAt}.

src/arm/codegen-arm.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // 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
@@ skipping 427 matching lines @@
   // Support for arguments.length and arguments[?].
   void GenerateArgumentsLength(ZoneList<Expression*>* args);
   void GenerateArguments(ZoneList<Expression*>* args);
 
   // Support for accessing the class and value fields of an object.
   void GenerateClassOf(ZoneList<Expression*>* args);
   void GenerateValueOf(ZoneList<Expression*>* args);
   void GenerateSetValueOf(ZoneList<Expression*>* args);
 
   // Fast support for charCodeAt(n).
-  void GenerateFastCharCodeAt(ZoneList<Expression*>* args);
+  void GenerateStringCharCodeAt(ZoneList<Expression*>* args);
 
   // Fast support for string.charAt(n) and string[n].
-  void GenerateCharFromCode(ZoneList<Expression*>* args);
+  void GenerateStringCharFromCode(ZoneList<Expression*>* args);
+
+  // Fast support for string.charAt(n) and string[n].
+  void GenerateStringCharAt(ZoneList<Expression*>* args);
 
   // Fast support for object equality testing.
   void GenerateObjectEquals(ZoneList<Expression*>* args);
 
   void GenerateLog(ZoneList<Expression*>* args);
 
   // Fast support for Math.random().
   void GenerateRandomHeapNumber(ZoneList<Expression*>* args);
 
   // Fast support for StringAdd.
@@ skipping 224 matching lines @@
              Token::String(op_),
              constant_rhs_);
     }
   }
 #endif
 };
 
 
 class StringHelper : public AllStatic {
  public:
-  // Generates fast code for getting a char code out of a string
-  // object at the given index. May bail out for four reasons (in the
-  // listed order):
-  //   * Receiver is not a string (receiver_not_string label).
-  //   * Index is not a smi (index_not_smi label).
-  //   * Index is out of range (index_out_of_range).
-  //   * Some other reason (slow_case label). In this case it's
-  //     guaranteed that the above conditions are not violated,
-  //     e.g. it's safe to assume the receiver is a string and the
-  //     index is a non-negative smi < length.
-  // When successful, object, index, and scratch are clobbered.
-  // Otherwise, scratch and result are clobbered.
-  static void GenerateFastCharCodeAt(MacroAssembler* masm,
-                                     Register object,
-                                     Register index,
-                                     Register scratch,
-                                     Register result,
-                                     Label* receiver_not_string,
-                                     Label* index_not_smi,
-                                     Label* index_out_of_range,
-                                     Label* slow_case);
-
-  // Generates code for creating a one-char string from the given char
-  // code. May do a runtime call, so any register can be clobbered
-  // and, if the given invoke flag specifies a call, an internal frame
-  // is required. In tail call mode the result must be r0 register.
-  static void GenerateCharFromCode(MacroAssembler* masm,
-                                   Register code,
-                                   Register scratch,
-                                   Register result,
-                                   InvokeFlag flag);
-
   // Generate code for copying characters using a simple loop. This should only
   // be used in places where the number of characters is small and the
   // additional setup and checking in GenerateCopyCharactersLong adds too much
   // overhead. Copying of overlapping regions is not supported.
   // Dest register ends at the position after the last character written.
   static void GenerateCopyCharacters(MacroAssembler* masm,
                                      Register dest,
                                      Register src,
                                      Register count,
                                      Register scratch,
@@ skipping 215 matching lines @@
     return ObjectBits::encode(object_.code()) |
            OffsetBits::encode(offset_.code()) |
            ScratchBits::encode(scratch_.code());
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CODEGEN_ARM_H_