[es6] Introduce %ToInteger and %ToLength.

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 $NaN;
 var $nonNumberToNumber;
 var $sameValue;
 var $sameValueZero;
-var $toInteger;
-var $toLength;
 var $toNumber;
 var $toPositiveInteger;
 
 var harmony_tolength = false;
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 var GlobalArray = global.Array;
@@ skipping 60 matching lines @@
     length = args.length;
     if (%_IsSmi(length) && length >= 0 && length < kSafeArgumentsLength) {
       return length;
     }
   }
 
   if (!IS_SPEC_OBJECT(args)) {
     throw %make_type_error(kWrongArgs, "Reflect.apply");
   }
 
-  length = %to_length_fun(args.length);
+  length = TO_LENGTH(args.length);
 
   // We can handle any number of apply arguments if the stack is
   // big enough, but sanity check the value to avoid overflow when
   // multiplying with pointer size.
   if (length > kSafeArgumentsLength) throw %make_range_error(kStackOverflow);
 
   // Return the length which is the number of arguments to copy to the
   // stack. It is guaranteed to be a small integer at this point.
   return length;
 }
@@ skipping 29 matching lines @@
       throw %make_type_error(kCalledNonCallable, TO_STRING(newTarget));
     } else {
       throw %make_type_error(kNotConstructor, TO_STRING(newTarget));
     }
   }
 
   if (!IS_SPEC_OBJECT(args)) {
     throw %make_type_error(kWrongArgs, "Reflect.construct");
   }
 
-  length = %to_length_fun(args.length);
+  length = TO_LENGTH(args.length);
 
   // We can handle any number of apply arguments if the stack is
   // big enough, but sanity check the value to avoid overflow when
   // multiplying with pointer size.
   if (length > kSafeArgumentsLength) throw %make_range_error(kStackOverflow);
 
   // Return the length which is the number of arguments to copy to the
   // stack. It is guaranteed to be a small integer at this point.
   return length;
 }
@@ skipping 48 matching lines @@
 function ToString(x) {
   if (IS_STRING(x)) return 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));
 }
 
 
-// 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);
-  if (arg < 0) return 0;
-  return arg < kMaxSafeInteger ? arg : kMaxSafeInteger;
-}
-
-
 // ES5, section 9.12
 function SameValue(x, y) {
   if (typeof x != typeof y) return false;
   if (IS_NUMBER(x)) {
     if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true;
     // x is +0 and y is -0 or vice versa.
     if (x === 0 && y === 0 && %_IsMinusZero(x) != %_IsMinusZero(y)) {
       return false;
     }
   }
@@ skipping 97 matching lines @@
 // boilerplate gets the right prototype.
 %FunctionSetPrototype(GlobalArray, new GlobalArray(0));
 
 // ----------------------------------------------------------------------------
 // Exports
 
 $NaN = %GetRootNaN();
 $nonNumberToNumber = NonNumberToNumber;
 $sameValue = SameValue;
 $sameValueZero = SameValueZero;
-$toInteger = ToInteger;
-$toLength = ToLength;
 $toNumber = ToNumber;
 $toPositiveInteger = ToPositiveInteger;
 
 %InstallToContext([
   "apply_prepare_builtin", APPLY_PREPARE,
   "concat_iterable_to_array_builtin", CONCAT_ITERABLE_TO_ARRAY,
   "reflect_apply_prepare_builtin", REFLECT_APPLY_PREPARE,
   "reflect_construct_prepare_builtin", REFLECT_CONSTRUCT_PREPARE,
 ]);
 
 %InstallToContext([
   "concat_iterable_to_array", ConcatIterableToArray,
   "non_number_to_number", NonNumberToNumber,
-  "to_integer_fun", ToInteger,
-  "to_length_fun", ToLength,
   "to_number_fun", ToNumber,
 ]);
 
 utils.Export(function(to) {
   to.ToBoolean = ToBoolean;
-  to.ToLength = ToLength;
   to.ToNumber = ToNumber;
   to.ToString = ToString;
 });
 
 })