[es6] Implement spec compliant ToName (actually ToPropertyKey).

src/runtime.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
 
 // The following declarations are shared with other native JS files.
 // They are all declared at this one spot to avoid redeclaration errors.
 var $defaultString;
 var $NaN;
 var $nonNumberToNumber;
 var $nonStringToString;
 var $sameValue;
 var $sameValueZero;
 var $toInteger;
 var $toLength;
-var $toName;
 var $toNumber;
 var $toPositiveInteger;
 var $toPrimitive;
 var $toString;
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 var GlobalArray = global.Array;
@@ skipping 394 matching lines @@
 function IN(x) {
   if (!IS_SPEC_OBJECT(x)) {
     throw %make_type_error(kInvalidInOperatorUse, this, x);
   }
   if (%_IsNonNegativeSmi(this)) {
     if (IS_ARRAY(x) && %_HasFastPackedElements(x)) {
       return this < x.length;
     }
     return %HasElement(x, this);
   }
-  return %HasProperty(x, %to_name(this));
+  return %HasProperty(x, this);
 }
 
 
 function CALL_NON_FUNCTION() {
   var delegate = %GetFunctionDelegate(this);
   if (!IS_FUNCTION(delegate)) {
     var callsite = %RenderCallSite();
     if (callsite == "") callsite = typeof this;
     throw %make_type_error(kCalledNonCallable, callsite);
   }
@@ skipping 161 matching lines @@
   return %to_number_fun(this);
 }
 
 
 // Convert the receiver to a string - forward to ToString.
 function TO_STRING() {
   return %to_string_fun(this);
 }
 
 
-// Convert the receiver to a string or symbol - forward to ToName.
-function TO_NAME() {
-  return %to_name(this);
-}
-
-
 /* -------------------------------------
    - - -   C o n v e r s i o n s   - - -
    -------------------------------------
 */
 
 // ECMA-262, section 9.1, page 30. Use null/undefined for no hint,
 // (1) for number hint, and (2) for string hint.
 function ToPrimitive(x, hint) {
   if (!IS_SPEC_OBJECT(x)) return x;
   if (hint == NO_HINT) hint = (IS_DATE(x)) ? STRING_HINT : NUMBER_HINT;
@@ skipping 48 matching lines @@
 
 function NonStringToString(x) {
   if (IS_NUMBER(x)) return %_NumberToString(x);
   if (IS_BOOLEAN(x)) return x ? 'true' : 'false';
   if (IS_UNDEFINED(x)) return 'undefined';
   // Types that can't be converted to string are caught in DefaultString.
   return (IS_NULL(x)) ? 'null' : ToString(DefaultString(x));
 }
 
 
-// ES6 symbols
-function ToName(x) {
-  return IS_SYMBOL(x) ? x : ToString(x);
-}
-
-
 // ECMA-262, section 9.4, page 34.
 function ToInteger(x) {
   if (%_IsSmi(x)) return x;
   return %NumberToInteger(ToNumber(x));
 }
 
 
 // ES6, draft 08-24-14, section 7.1.15
 function ToLength(arg) {
   arg = ToInteger(arg);
@@ skipping 117 matching lines @@
 // Exports
 
 $defaultString = DefaultString;
 $NaN = %GetRootNaN();
 $nonNumberToNumber = NonNumberToNumber;
 $nonStringToString = NonStringToString;
 $sameValue = SameValue;
 $sameValueZero = SameValueZero;
 $toInteger = ToInteger;
 $toLength = ToLength;
-$toName = ToName;
 $toNumber = ToNumber;
 $toPositiveInteger = ToPositiveInteger;
 $toPrimitive = ToPrimitive;
 $toString = ToString;
 
 %InstallToContext([
   "add_builtin", ADD,
   "add_strong_builtin", ADD_STRONG,
   "apply_prepare_builtin", APPLY_PREPARE,
   "bit_and_builtin", BIT_AND,
@@ skipping 23 matching lines @@
   "sar_strong_builtin", SAR_STRONG,
   "shl_builtin", SHL,
   "shl_strong_builtin", SHL_STRONG,
   "shr_builtin", SHR,
   "shr_strong_builtin", SHR_STRONG,
   "stack_overflow_builtin", STACK_OVERFLOW,
   "string_add_left_builtin", STRING_ADD_LEFT,
   "string_add_right_builtin", STRING_ADD_RIGHT,
   "sub_builtin", SUB,
   "sub_strong_builtin", SUB_STRONG,
-  "to_name_builtin", TO_NAME,
   "to_string_builtin", TO_STRING,
 ]);
 
 %InstallToContext([
   "concat_iterable_to_array", ConcatIterableToArray,
   "non_number_to_number", NonNumberToNumber,
   "non_string_to_string", NonStringToString,
   "to_integer_fun", ToInteger,
   "to_length_fun", ToLength,
-  "to_name", ToName,
   "to_number_fun", ToNumber,
   "to_primitive", ToPrimitive,
   "to_string_fun", ToString,
 ]);
 
 utils.Export(function(to) {
   to.ToBoolean = ToBoolean;
   to.ToLength = ToLength;
-  to.ToName = ToName;
   to.ToNumber = ToNumber;
   to.ToPrimitive = ToPrimitive;
   to.ToString = ToString;
 });
 
 })