[es6] Introduce %ToInteger and %ToLength.

src/string.js

 // Copyright 2012 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.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
@@ skipping 137 matching lines @@
 
 
 // ECMA-262 section 15.5.4.10
 function StringMatchJS(regexp) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.match");
 
   var subject = TO_STRING(this);
   if (IS_REGEXP(regexp)) {
     // Emulate RegExp.prototype.exec's side effect in step 5, even though
     // value is discarded.
-    var lastIndex = regexp.lastIndex;
-    TO_INTEGER_FOR_SIDE_EFFECT(lastIndex);
+    var lastIndex = TO_INTEGER(regexp.lastIndex);
     if (!regexp.global) return RegExpExecNoTests(regexp, subject, 0);
     var result = %StringMatch(subject, regexp, RegExpLastMatchInfo);
     if (result !== null) $regexpLastMatchInfoOverride = null;
     regexp.lastIndex = 0;
     return result;
   }
   // Non-regexp argument.
   regexp = new GlobalRegExp(regexp);
   return RegExpExecNoTests(regexp, subject, 0);
 }
@@ skipping 50 matching lines @@
   // ...... global search
   // ...... non-global search
   // .. string search
   // .... special case that replaces with one single character
   // ...... function replace
   // ...... string replace (with $-expansion)
 
   if (IS_REGEXP(search)) {
     // Emulate RegExp.prototype.exec's side effect in step 5, even if
     // value is discarded.
-    var lastIndex = search.lastIndex;
-    TO_INTEGER_FOR_SIDE_EFFECT(lastIndex);
+    var lastIndex = TO_INTEGER(search.lastIndex);
 
     if (!IS_CALLABLE(replace)) {
       replace = TO_STRING(replace);
 
       if (!search.global) {
         // Non-global regexp search, string replace.
         var match = RegExpExec(search, subject, 0);
         if (match == null) {
           search.lastIndex = 0
           return subject;
@@ skipping 687 matching lines @@
 function StringSup() {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.sup");
   return "<sup>" + TO_STRING(this) + "</sup>";
 }
 
 // ES6 draft 01-20-14, section 21.1.3.13
 function StringRepeat(count) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.repeat");
 
   var s = TO_STRING(this);
-  var n = $toInteger(count);
+  var n = TO_INTEGER(count);
   // The maximum string length is stored in a smi, so a longer repeat
   // must result in a range error.
   if (n < 0 || n > %_MaxSmi()) throw MakeRangeError(kInvalidCountValue);
 
   var r = "";
   while (true) {
     if (n & 1) r += s;
     n >>= 1;
     if (n === 0) return r;
     s += s;
   }
 }
 
 
 // ES6 draft 04-05-14, section 21.1.3.18
 function StringStartsWith(searchString /* position */) {  // length == 1
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.startsWith");
 
   var s = TO_STRING(this);
 
   if (IS_REGEXP(searchString)) {
     throw MakeTypeError(kFirstArgumentNotRegExp, "String.prototype.startsWith");
   }
 
   var ss = TO_STRING(searchString);
   var pos = 0;
   if (%_ArgumentsLength() > 1) {
     var arg = %_Arguments(1);  // position
     if (!IS_UNDEFINED(arg)) {
-      pos = $toInteger(arg);
+      pos = TO_INTEGER(arg);
     }
   }
 
   var s_len = s.length;
   if (pos < 0) pos = 0;
   if (pos > s_len) pos = s_len;
   var ss_len = ss.length;
 
   if (ss_len + pos > s_len) {
     return false;
@@ skipping 18 matching lines @@
   if (IS_REGEXP(searchString)) {
     throw MakeTypeError(kFirstArgumentNotRegExp, "String.prototype.endsWith");
   }
 
   var ss = TO_STRING(searchString);
   var s_len = s.length;
   var pos = s_len;
   if (%_ArgumentsLength() > 1) {
     var arg = %_Arguments(1);  // position
     if (!IS_UNDEFINED(arg)) {
-      pos = $toInteger(arg);
+      pos = TO_INTEGER(arg);
     }
   }
 
   if (pos < 0) pos = 0;
   if (pos > s_len) pos = s_len;
   var ss_len = ss.length;
   pos = pos - ss_len;
 
   if (pos < 0) {
     return false;
@@ skipping 89 matching lines @@
 
 // -------------------------------------------------------------------
 // String methods related to templates
 
 // ES6 Draft 03-17-2015, section 21.1.2.4
 function StringRaw(callSite) {
   // TODO(caitp): Use rest parameters when implemented
   var numberOfSubstitutions = %_ArgumentsLength();
   var cooked = TO_OBJECT(callSite);
   var raw = TO_OBJECT(cooked.raw);
-  var literalSegments = $toLength(raw.length);
+  var literalSegments = TO_LENGTH(raw.length);
   if (literalSegments <= 0) return "";
 
   var result = TO_STRING(raw[0]);
 
   for (var i = 1; i < literalSegments; ++i) {
     if (i < numberOfSubstitutions) {
       result += TO_STRING(%_Arguments(i));
     }
     result += TO_STRING(raw[i]);
   }
@@ skipping 72 matching lines @@
   to.StringLastIndexOf = StringLastIndexOfJS;
   to.StringMatch = StringMatchJS;
   to.StringReplace = StringReplace;
   to.StringSlice = StringSlice;
   to.StringSplit = StringSplitJS;
   to.StringSubstr = StringSubstr;
   to.StringSubstring = StringSubstring;
 });
 
 })