Add a MathFloor stub generated with TurboFan

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'.
 
@@ skipping 44 matching lines @@
 var CALL_FUNCTION_PROXY_AS_CONSTRUCTOR;
 var APPLY_PREPARE;
 var REFLECT_APPLY_PREPARE;
 var REFLECT_CONSTRUCT_PREPARE;
 var STACK_OVERFLOW;
 var TO_OBJECT;
 var TO_NUMBER;
 var TO_STRING;
 var TO_NAME;
 
-var STRING_LENGTH_STUB;
+var StringLengthTF_STUB;
+var MathFloor_STUB;
 
 var $defaultNumber;
 var $defaultString;
 var $NaN;
 var $nonNumberToNumber;
 var $nonStringToString;
 var $sameValue;
 var $sameValueZero;
 var $toBoolean;
 var $toInt32;
@@ skipping 667 matching lines @@
 TO_NAME = function TO_NAME() {
   return %$toName(this);
 }
 
 
 /* -----------------------------------------------
    - - -   J a v a S c r i p t   S t u b s   - - -
    -----------------------------------------------
 */
 
-STRING_LENGTH_STUB = function STRING_LENGTH_STUB(name) {
-  var receiver = this;  // implicit first parameter
+StringLengthTF_STUB = function StringLengthTF_STUB(receiver, name) {
   return %_StringGetLength(%_JSValueGetValue(receiver));
 }
 
+MathFloor_STUB = function MathFloor_STUB(f, i, v) {
+  // |f| is calling function's JSFunction
+  // |i| is TypeFeedbackVector slot # of callee's CallIC for Math.floor call
+  // |v| is the value to floor
+  var r = %_MathFloor(+v);
+  if (%_IsMinusZero(r)) {
+    // Collect type feedback when the result of the floor is -0. This is
+    // accomplished by storing a sentinel in the second, "extra"
+    // TypeFeedbackVector slot corresponding to the Math.floor CallIC call in
+    // the caller's TypeVector.
+    %_FixedArraySet(%_GetTypeFeedbackVector(f), ((i|0)+1)|0, 1);
+    return -0;
+  }
+  // Return integers in smi range as smis.
+  var trunc = r|0;
+  if (trunc === r) {
+    return trunc;
+  }
+  return r;
+}
+
 
 /* -------------------------------------
    - - -   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) {
   // Fast case check.
@@ skipping 223 matching lines @@
 $toLength = ToLength;
 $toName = ToName;
 $toNumber = ToNumber;
 $toObject = ToObject;
 $toPositiveInteger = ToPositiveInteger;
 $toPrimitive = ToPrimitive;
 $toString = ToString;
 $toUint32 = ToUint32;
 
 })